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Articoli di riviste sul tema "Heat resistant alloys"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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1

Wang, Xiaomin, Yang Su, Lili Guo, Yan Liu, Honggang Li e Hailin Ren. "Research Progress of Heat Resistant Magnesium Alloys". Journal of Physics: Conference Series 2160, n. 1 (1 gennaio 2022): 012015. http://dx.doi.org/10.1088/1742-6596/2160/1/012015.

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Abstract Magnesium alloy has extremely excellent properties and is known as “21st Century Green Engineering Material”. This article mainly introduces the influence of the heat resistance and comprehensive performance of the three series of Mg-Al, Mg-Zn and Mg-RE heat-resistant magnesium alloys after adding rare earth elements, alkali metal elements and other elements. Three development directions of improving the heat resistance of magnesium alloys are prospected. These are: 1. Using cheap alloy elements (such as Ca, Si, etc.) to replace rare earth elements of the heat-resistant magnesium alloy, 2. Titanium element is added to improve heat-resistant magnesium alloy’s mechanical properties and its strength, 3. The new casting process and processing technology are used to improve the heat-resistant magnesium alloy’s properties. This article aims to provide technical reference for the development of my country’s magnesium alloy industry.

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2

Fridlyander, I. N., V. V. Antipov, T. P. Fedorenko e E. G. Jakimova. "Properties of Rolled and Extruded Semiproducts Made of New Al-Cu-Mg-Ag Heat-Resistant B-1213 Alloy". Materials Science Forum 519-521 (luglio 2006): 483–88. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.483.

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Main properties and structure of 2 mm thick sheets and 20×100 mm extruded strips made under industrial conditions from Al-Cu-Mg heat-resistant B-1213 alloy with Ag, Cr, Mn and Zr additions were investigated. It was stated that wrought B-1213 alloy semiproducts are superior to analogous semis made of widely used commercial heat resistant AK4-1ch-type alloys (analogues - AU2GN, 2618 alloys) in strength properties and heat resistance characteristics (by 10-20 %) as well as in crack resistance and fatigue life (by 20-40 %). B-1213 alloy is intended for replacement of traditional heat-resistant alloys of system Al-Cu-Mg-Fe-Ni in advanced aircraft primary structure components subjected heating at elevated temperatures (up to 200-250 oC) and allows one to increase weight efficiency, service life and reliability.

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3

Shalomeev, V. A., E. I. Tsyvirko, V. V. Klochyhin e I. O. Chetvertak. "Heat-resistant magnesium-based alloys for aircraft casting". Metaloznavstvo ta obrobka metalìv 95, n. 3 (15 settembre 2020): 16–24. http://dx.doi.org/10.15407/mom2020.03.016.

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4

Han, Yu, Bao An Chen, Zhi Xiang Zhu, Dong Yu Liu e Yan Qiu Xia. "Effects of Zr on Microstructure and Conductivity of Er Containing Heat-Resistant Aluminum Alloy Used for Wires". Materials Science Forum 852 (aprile 2016): 205–10. http://dx.doi.org/10.4028/www.scientific.net/msf.852.205.

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It has particular heat-resistant property and conductivity of high-conductivity heat-resistant Aluminium alloys, which would be wildly applied in transmission and transformation flied. Al-Er-Zr alloys containing different content of Zr were prepared. The effect of Zr on microstructure of heat-resistance Aluminum alloy were studied by using of STEM, and thermodynamic behavior of Zr in Aluminium alloy was analyzed based on the theory of alloy phase formation. The results showed that the effect of Zr content on the grain size of heat-resistant aluminum alloy was remarkable, and the conductivity of heat-resistance Aluminum alloy was influenced.

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5

Rowe, M. D., V. R. Ishwar e D. L. Klarstrom. "Properties, Weldability, and Applications of Modern Wrought Heat-Resistant Alloys for Aerospace and Power Generation Industries". Journal of Engineering for Gas Turbines and Power 128, n. 2 (1 marzo 2004): 354–61. http://dx.doi.org/10.1115/1.2056527.

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Alloy selection and alloy design both require consideration of an array of material attributes, including in-service properties, weldability, and fabricability. Critical properties of modern heat-resistant alloys for gas turbine applications include high-temperature strength, thermal stability, oxidation resistance, and fatigue resistance. In this paper, the properties of 12 solid-solution-strengthened and six age-hardenable heat-resistant alloys are compared. Weldability is an important attribute and can be a major limiting factor in the use of certain alloys. Weldability test methods are discussed, and the resistance of alloys to solidification cracking and strain-age cracking is compared. The use of weldability testing in the development of modern heat-resistant alloys is discussed with several examples cited. Finally, alloy selection for gas turbine components is outlined, taking into account both alloy properties and fabricability.

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6

Mazalov, P. B., D. I. Suhov, E. A. Sulyanova e I. S. Mazalov. "HEAT-RESISTANT COBALT-BASED ALLOYS". Aviation Materials and Technologies, n. 3 (2021): 3–10. http://dx.doi.org/10.18577/2713-0193-2021-0-3-3-10.

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Cobalt-based alloys are widely used for manufacturing of various components of gas turbine engines and gas turbines such as vanes and combustion chambers both in wrought state and as cast parts. They have been designed for improving the heat resistance due to solid solution and carbide-strengthening mechanisms. In order to obtain satisfactory oxidation resistance and hot corrosion resistance cobalt-based alloys are doped with sufficient amount of chromium (above 15 % wt.). Recently additive manufacturing has started to use cobalt-based alloys. The paper considers the features of the structure of high-temperature cobalt-based alloys and their application in various branches of industry.

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7

Al-Meshari, Abdulaziz, e John Little. "Oxidation of Heat-resistant Alloys". Oxidation of Metals 69, n. 1-2 (20 dicembre 2007): 109–18. http://dx.doi.org/10.1007/s11085-007-9086-6.

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8

Vahrusheva, Vera, Diana Hlushkova, Volodymyr Volchuk, Tetyana Nosova, Stella Mamchur, Natalia Tsokur, Valeriy Bagrov, Sergey Demchenko, Yuri Ryzhkov e Victor Scrypnikov. "The effect of heat treatment on the corrosion resistance of power equipment parts". Bulletin of Kharkov National Automobile and Highway University, n. 97 (5 settembre 2022): 24. http://dx.doi.org/10.30977/bul.2219-5548.2022.97.0.24.

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For the manufacture of parts and assemblies of the turbopump unit of details of power equipment, welded joints with corrosion resistant steels and heat-resistant alloys are used, requiring various modes heat treatment to achieve the required level of mechanical properties. In the manufacture of parts and assemblies of details of power equipment at the machine-building enterprises of Ukraine, it became necessary to replace semi-finished products. It is necessary to replace sheet products from high-alloy alloys ХН67МВТЮ and 06Х15Н6МВФБ with one alloy with a high complex of physical and mechanical characteristics. In the work, as a replacement for the applied heat-resistant alloys, Inconel 718 alloy welded to 316L steel. Samples of welded joints, processed according to the recommended mode, showed increased corrosion resistance.

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9

Khalikov, Albert R., Evgeny A. Sharapov, Vener A. Valitov, Elvina V. Galieva, Elena A. Korznikova e Sergey V. Dmitriev. "Simulation of Diffusion Bonding of Different Heat Resistant Nickel-Base Alloys". Computation 8, n. 4 (30 novembre 2020): 102. http://dx.doi.org/10.3390/computation8040102.

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Currently, an important fundamental problem of practical importance is the production of high-quality solid-phase compounds of various metals. This paper presents a theoretical model that allows one to study the diffusion process in nickel-base refractory alloys. As an example, a two-dimensional model of ternary alloy is considered to model diffusion bonding of the alloys with different compositions. The main idea is to divide the alloy components into three groups: (i) the base element Ni, (ii) the intermetallic forming elements Al and Ti and (iii) the alloying elements. This approach allows one to consider multi-component alloys as ternary alloys, which greatly simplifies the analysis. The calculations are carried out within the framework of the hard sphere model when describing interatomic interactions by pair potentials. The energy of any configuration of a given system is written in terms of order parameters and ordering energies. A vacancy diffusion model is described, which takes into account the gain/loss of potential energy due to a vacancy jump and temperature. Diffusion bonding of two dissimilar refractory alloys is modeled. The concentration profiles of the components and order parameters are analyzed at different times. The results obtained indicate that the ternary alloy model is efficient in modeling the diffusion bonding of dissimilar Ni-base refractory alloys.

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Osipov, P. A., R. A. Shayakhmetova, A. B. Sagyndykov, A. V. Panichkin e A. A. Kali. "DENSITY OF HEAT-RESISTANT TITANIUM ALLOYS DOPED WITH LANTHANUM AND RHENIUM". Vestnik of the Kyrgyz-Russian Slavic University 23, n. 4 (aprile 2023): 79–86. http://dx.doi.org/10.36979/1694-500x-2023-23-4-79-86.

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11

Li, Delin, e Clayton Sloss. "Heat Treatment of Heat-Resistant Ferrous Cast Alloys". International Journal of Metalcasting 9, n. 2 (aprile 2015): 7–20. http://dx.doi.org/10.1007/bf03355611.

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12

KALININA, N. Ye, T. V. NOSOVA, N. I. TSOKUR, D. B. GLUSHKOVA, I. G. KIRICHENKO e S. V. DEMCHENKO. "INCREASING CORROSION RESISTANCE OF WELDED JOINTS AS A RESULT OF HEAT TREATMENT". Physical Metallurgy and Heat Treatment of Metals 3, n. 3 (98) (24 novembre 2022): 28–32. http://dx.doi.org/10.30838/j.pmhtm.2413.270922.28.902.

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Welded joints with corrosion-resistant steels and heat-resistant alloys, which require different modes of heat treatment to achieve the level of mechanical properties specified in the design documentation, are used for the manufacture parts and assemblies of the rocket engine turbopump unit. Problem statement. In the production of rocket engine parts and components, due to difficulties in supplying materials from EU countries, Ukrainian machine-building enterprises have to substitute semi-finished products. It is necessary to replace sheet metal from high-alloy alloys with one alloy with a high complex of physical and mechanical characteristics. Materials and methodology. Inconel 718 alloy is selected as a substitute for heat-resistant alloys in welded joints with 316L steel. Results. As a result of comparative studies for resistance to intergranular corrosion of welded joints of heat-resistant alloy Inconel 718 with stainless steel after different modes of heat treatment the regime of low-temperature heating during soldering at 950 °С is recommended. Samples of welded joints treated according to the recommended mode showed increased corrosion resistance. Scientific novelty. The sensitivity to intergranular corrosion was found to result from the structural heterogeneity of the grain boundaries and the separation of secondary phases. Practical value. On the basis of experimental researches the mode of heat treatment with heating to 950 ± 10 0С, cooling to 300 0С − with the furnace, further − in air, instead of existing high-temperature heating to 1 200 0С is recommended, that promotes energy saving at welding of alloys.

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13

Byba, I. G., G. B. Levchenko e O. O. Polehenko. "Heat-resistant intermetallic-based alloys and features of their alloying". Metaloznavstvo ta obrobka metalìv 30, n. 2 (28 giugno 2024): 58–67. http://dx.doi.org/10.15407/mom2024.02.058.

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The work considers the prerequisites for the development of creep-resistant and heat-resistant alloys, based on intermetallics, taking into account the optimal combination of their physical and mechanical properties, as well as structural characteristics. It is shown that there is a sufficient number of intermetallics, which have a density lower than iron-based alloys, which, in combination with high melting temperatures and heat resistance, makes them promising materials for aerospace application, in particular, for gas turbine engine parts manufacturing. The most suitable creep-resistant and heat-resistant intermetallics can be called aluminides and silicides of titanium, nickel and molybdenum. For these compounds, it is possible to combine high values of specific strength with alloying-favorable types of crystal lattice. One of the most important and common creep-resistant alloys based on intermetallics is Ni3Al with FCC lattice. For this material, complex optimized alloying is the main way to increase creep resistance. The heat resistance of such alloys is significantly increased by applying ceramic coatings. Titanium aluminides Ti3Al and TiAl mainly have only a low density among the advantages. Their fragility at room temperatures and tendency to superplasticity at high temperatures significantly limits their application. The impact of disadvantages may be reduced by applying thermomechanical processing of such materials, which aims to change their structure. Alloying titanium aluminides with a large amount of niobium was chosen as a solution that significantly reduced marked week sides of Ti-Al intermetallic alloys. As a result, this led to the creation of a new alloy based on intermetallic Ti2AlNb with a high set of operational characteristics. Mo-Si and Mo-Si-B can be considered as one of the most perfect systems for creating heat-resistant intermetallic alloys. They combine an acceptable density, high creep and heat resistance, which can be additionally increased by reinforcing with ceramic particles. Keywords: intermetallic-based alloys, creep resistance, alloying, Ni-Al, Ti-Al, Mo-Si, Mo-Si-B.

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14

Larionova, Tatyana, Sergei A. Lyubomudrov e Evgeniy Larionov. "Machinability of Heat-Resistant Titanium Alloys during Turning". Materials Science Forum 1022 (febbraio 2021): 62–70. http://dx.doi.org/10.4028/www.scientific.net/msf.1022.62.

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The article discusses the properties and features of heat-resistant titanium alloys. The microstructure of a new titanium alloy VT41, its mechanical and service properties after various processing modes are presented. The main problems in the machining of difficult-to-machine titanium alloys are considered. The developed mathematical model of the formation of errors in turning titanium alloys, taking into account thermal deformations and dimensional wear of the cutting tool, elastic deformations of the technological system, is described. The paper presents the results of experimental research on turning of heat-resistant titanium alloy VT41 on a multi-parameter stand.

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Kalinina, Nataliya, Vasiliy Kalinin e Ivannа Serzhenko. "Studying the effect of heat treatment modes on corrosion resistance of welded joints". Bulletin of Kharkov National Automobile and Highway University, n. 94 (16 dicembre 2021): 23. http://dx.doi.org/10.30977/bul.2219-5548.2021.94.0.23.

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Welded joints with corrosion-resistant steels and heat-resistant alloys, which require different modes of heat treatment to achieve the level of mechanical properties specified in the design documentation, are used for the manufacture of parts and components of the turbo-pumping unit (TPU) and liquid rocket engine. Heat-resistant alloys are a large group of alloys on iron, nickel and cobalt bases with the addition of chromium and other alloying elements (C, V, Mo, Nb, W, Ti, Al, B, etc.), whose main feature is to maintain high strength at high and cryogenic temperatures. Heat-resistant alloys are used in the manufacture of many parts of gas turbines in rocketry and jet aircraft, stationary gas turbines, the pumping of oil and gas, hydrogenation of fuel in metallurgical furnaces and many other installations. For the doping of nickel chromium γ-solid solution, several elements are used, which differently influence the increase of heat resistance and processability. Along with the main reinforcing elements (Ti, Al), refractory elements (W, Mo, Nb) are introduced into the alloy, which increase the thermal stability of the solid solution. Heat resistant alloys are based on cobalt. Cobalt has a positive effect on the heat-resistant properties of alloys. The introduction of chromium in cobalt increases its heat resistance and hardness. In addition to chromium, alloys containing cobalt include additives of other alloying elements that improve their various properties at high temperatures. A characteristic feature of these alloys is that they have relatively low heat resistance characteristics at moderate temperatures, which, however, change a little with the temperature up to 900 ° C and therefore become quite high compared to the characteristics of other heat-resistant alloys. A significant drawback of these alloys is their high cost due to the costly cobalt. Nickel-based heat-resistant alloys typically have a complex chemical composition. It includes 12–13 components, carefully balanced to obtain the required properties. The content of impurities such as silicon (Si), phosphorus (P), sulfur (S), oxygen (O) and nitrogen (N) is also controlled. The content of elements such as selenium (Se), tellurium (Te), lead (Pb) and bismuth (Bi) should be negligible, which is provided by the selection of charge materials with low content of these elements, because it is not possible to get rid of them during melting. These alloys typically contain 10–12 % chromium (Cr), up to 8% aluminum (Al) and titanium (Ti), 5–10 % cobalt (Co), as well as small amounts of boron (B), zirconium (Zr) and carbon (C). Molybdenum (Mo), tungsten (W), niobium (Nb), tantalum (Ta) and hafnium (Hf) are sometimes added. Heat-resistant alloys are used for the production of many parts of gas turbines in rocketry and jet aircrafts, stationary gas turbines, for pumping oil and gas products, for hydrogenation of fuel in metallurgical furnaces and in many other installations. Nickel-based heat-resistant alloys are also cryogenic, i.e., they are capable of operating and retaining mechanical properties at very low temperatures (–100 °C to –269 °C). Such alloys are chromium-nickel alloys having an austenitic structure. Not only do they have good mechanical properties that do not change over a large temperature range (–200 °C to 900 °C), they can also work in corrosive environments. Nickel-based heat-resistant alloys typically have a complex chemical composition. It includes 12–13 components, carefully balanced to obtain the required properties. Welded and combined workpieces are made of separate components that are interconnected by various welding methods. Welded and combined blanks greatly simplify the creation of complex configuration designs. Improper workpiece design or incorrect welding technology can cause defects (grooves, porosity, internal stresses) that are difficult to correct by machining. Given that finding replacements with multiple materials, working them out in production, and investigating interconnectivity during thermal forces in a product can take considerable time and money, it would be best to replace one alloy. Unifying the material used would allow the structure to work as a whole, which would increase the manufacturability of the products. After examining the different replacement options, inconel 718 was selected for the study. Studies of welded specimens of inconel 718 alloy-stainless steel for resistance to the ICC have shown that it is not appropriate to use welded inconel 718 for the impeller, it is advisable to use material that would ensure uninterrupted operation in a corrosive environment at cryogenic temperatures. Based on the working conditions of the parts, it is most expedient to make it from heat-resistant chromium-nickel alloys, namely, from float inconel 718 which meets the necessary strength characteristics. The recommended soldering mode is heating up to 950 ± 10 oC, holding for 30 minutes from the moment of loading into the oven, cooling to 3000C with the oven, further in the air, since it has less influence on the corrosion resistance of steels in stainless steel joints. Quality control of inconel 718 alloy by GOST methods similar to that used for the control of X67MBHT type alloys showed the results similar to those obtained by the ASTM and AMS control methods.

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Groza, Joanna. "Heat-resistant dispersion-strengthened copper alloys". Journal of Materials Engineering and Performance 1, n. 1 (febbraio 1992): 113–21. http://dx.doi.org/10.1007/bf02650042.

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Skachkov, O. A. "Heat-resistant structural-grade powder alloys". Metallurgist 48, n. 9-10 (settembre 2004): 484–86. http://dx.doi.org/10.1007/s11015-005-0010-5.

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18

Ospennikova, O. G., B. S. Lomberg, N. V. Moiseev e D. V. Kapitanenko. "Isothermal Deformation of Heat-Resistant Alloys". Metallurgist 57, n. 9-10 (gennaio 2014): 949–53. http://dx.doi.org/10.1007/s11015-014-9827-0.

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19

Amenova, Aliya, Nikolay Belov, Dauletkhan Smagulov e Ainagul Toleuova. "Scientifically Based Choice of Heat-Resistant Cast Aluminum Alloys of New Generation". Applied Mechanics and Materials 372 (agosto 2013): 49–53. http://dx.doi.org/10.4028/www.scientific.net/amm.372.49.

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The phase composition of the AlNiMnFeSiZr system is analyzed as applied to heat resistant nikalines (aluminum alloys of a new generation based on Ni containing eutectic), which are strengthened by the Al3Zr (L12) nanoparticles. It is shown that the presence of iron and silicon considerably complicates the phase analysis when compared with the AN4Mts2 base alloy. Silicon strongly widens the crystallization range, which increases the tendency of the alloy to form hot cracks during casting. It is shown that economically doped nikaline AN2ZhMts substantially exceeds the most heat resistant cast aluminum alloys of the AM5 grade in the totality of its main characteristics (heat resistance and mechanical and production properties).

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Getsov, L. B., A. I. Rybnikov, I. S. Malashenko, K. Yu Yakovchuk, Yu P. Belolipetskii e V. N. Torgov. "The fatigue resistance of heat resistant alloys with coatings". Strength of Materials 22, n. 5 (maggio 1990): 685–91. http://dx.doi.org/10.1007/bf00806269.

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程, 鹏. "Research Progress on Heat-Resistant Phases in Cast Heat-Resistant Aluminum Alloys". Material Sciences 14, n. 04 (2024): 433–42. http://dx.doi.org/10.12677/ms.2024.144050.

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Lo´pez de Lacalle, L. N., J. A. Sa´nchez, A. Lamikiz e A. Celaya. "Plasma Assisted Milling of Heat-Resistant Superalloys". Journal of Manufacturing Science and Engineering 126, n. 2 (1 maggio 2004): 274–85. http://dx.doi.org/10.1115/1.1644548.

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The term Thermal Enhanced Machining refers to a conventional cutting process in which an external energy source is used to enhance the chip-generation mechanism. The work presented here analyzes the basic aspects and the experimental results obtained when applying an assisting plasma jet to the milling process. This process, known as PAM (Plasma Assisted Milling) has been applied to the machining of three very low machinability materials: a Ni-base alloy (Inconel 718), a Co-base alloy (Haynes 25), (both belonging to the group of the heat-resistant alloys) and the Ti-base alloy Ti6Al4V. The study focuses on two major topics. First, the efficiency of the milling operation in terms of cutting speed, feed, axial and radial depths of cut and the plasma operating parameters has been addressed. Second, a study on the alterations of the metallurgical structure and the properties of materials after the PAM has also been performed. The process conditions for the above-mentioned Ni-base and Co-base alloys are detailed. The study under these conditions has shown an excellent performance of the whisker reinforced ceramic tools. In fact, cutting speeds as high as 970 m/min and large radial and axial depths of cuts are possible, driving to a cost-effective machining process. The absence of changes in the metallurgical structure of the alloys after applying the PAM process is also addressed. Therefore, it can be stated that this is a feasible approach to the optimization of the machining process of heat-resistant alloys. Finally, the results obtained in the PAM of Ti6Al4V are detailed. In this experimentation, a certain level of degradation was observed in the microstructure of the alloy when undergoing the PAM process, therefore the use of this technique is not recommended for this material.

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Kozlov, Arkadiy, e M. Deryabin. "Pulsed Processes when Cutting Heat-Resistant Alloys". Key Engineering Materials 496 (dicembre 2011): 144–49. http://dx.doi.org/10.4028/www.scientific.net/kem.496.144.

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In this paper, the pulsed processes of machining by cutting heat-resistant alloys are consid-ered. It is proved that such processes can exclude unwanted loss of the steadiness of elastoplastic deformations in the chip formation zone. As a result the accuracy of machining, the quality of ma-chined surface and the resistance to wear of the cutting tool increase. Finally, some methods of in-tensification of pulsed processes when cutting difficult to machine materials have been suggested.

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Glotka, O., e V. Olshanetskii. "Properties of nickel-based superalloys of equiaxial crystallization". Innovative Materials and Technologies in Metallurgy and Mechanical Engineering, n. 1 (14 settembre 2021): 19–23. http://dx.doi.org/10.15588/1607-6885-2021-2-3.

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Purpose. The aim of the work is to obtain predictive regression models, with the help of which, it is possible to adequately calculate the mechanical properties of nickel-based superalloys of equiaxial crystallization, without carrying out preliminary experiments. Research methods. To find regularities and calculate the latest CALPHAD method was chosen, and modeling of thermodynamic processes of phase crystallization was performed. Results. As a result of experimental data processing, the ratio of alloying elements Kg¢ was proposed for the first time, which can be used to assess the mechanical properties, taking into account the complex effect of the main alloy components. The regularities of the influence of the composition on the properties of heat-resistant nickel alloys of equiaxial crystallization are established. The analysis of the received dependences in comparison with practical results is carried out. The relations well correlated with heat resistance, mismatch and strength of alloys are obtained. Scientific novelty. It is shown that for multicomponent nickel systems it is possible with a high probability to predict a mismatch, which significantly affects the strength characteristics of alloys of this class. The regularities of the influence of the chemical composition on the structure and properties of alloys are established. A promising and effective direction in solving the problem of predicting the main characteristics of heat-resistant materials based on nickel is shown Practical value. On the basis of an integrated approach for multicomponent heat-resistant nickel-based alloys, new regression models have been obtained that make it possible to adequately predict the properties of the chemical composition of the alloy, which made it possible to solve the problem of computational prediction of properties from the chemical composition of the alloy. This allows not only to design new nickel-based alloys, but also to optimize the composition of existing brands.

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Povarova, K. B., A. E. Morozov e A. A. Drozdov. "Heat-resistant RuAl-based alloys. Part I. Casting alloys". Perspektivnye Materialy, n. 11 (2019): 5–18. http://dx.doi.org/10.30791/1028-978x-2019-11-5-18.

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Povarova, K. B., A. E. Morozov e A. A. Drozdov. "Heat-Resistant RuAl-Based Alloys: Part I. Cast Alloys". Inorganic Materials: Applied Research 11, n. 2 (marzo 2020): 277–86. http://dx.doi.org/10.1134/s2075113320020318.

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Saikawa, Seiji, Manabu Mizutani e Nozomu Kawabe. "Effect of Sn Content on Heat Resistance of Mg-3%Al-1%Si Alloy for Casting". Materials Science Forum 941 (dicembre 2018): 1071–76. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1071.

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Magnesium alloys have the characteristic with high specific strength and lightweight property, it is widely used for auto mobile industry. Heat-resistant magnesium alloy is focused as a suitable material for weight reduction of the engine and power train parts in automotive field. In this study, microstructure and heat-resistant property in Mg-3mass%Al-1mass%Si (Mg-3%Al-1%Si) alloy with containing large amount of Sn (tin) were investigated. The alloys produced by permanent mold casting were investigated by optical microscope (OM), scanning electron microscopy (SEM) and measuring of bolt load retention at 423K. The heat-resistant property of Mg-3mass % Al-1mass % Si alloy with containing 6-13masss%Sn was higher compared with Sn free alloy and conventional Magnesium alloys (e.g. AZ91 and AM60 alloys).

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Evdokimov, V. B., A. A. Artamonov, E. V. Plotnikov e N. A. Konstantinova. "RESOURCE-EFFICIENT METHODS FOR PREDICTING AND SELECTING HEAT-RESISTANT ALLOYS". Resource-Efficient Technologies, n. 2 (11 luglio 2019): 17–28. http://dx.doi.org/10.18799/24056537/2019/2/233.

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The power plant resource efficiency is largely dependent on heat-resistant alloys and is limited by the standard turbine operating temperature, which is slightly greater than 1000°C. These temperature limits are dependent on the characteristics of the heat-resistant alloys used in power plants. The current research aimed to discover new heat-resistant alloys using computer-based models to simulate the various properties of such materials. The first-principle methods were initially used in this study. These methods can determine the most important properties of alloys with a high degree of accuracy. This study presented an overview of the software used for first-principle simulation. Using RuAl as the demonstration alloy in this study, we provided step-by-step instructions on how to effectively study the properties of the heat-resistant alloys. Using the first-principle methods, the phonon spectrum and density of the phonon states of B2 RuAl were assessed. We use the parameters of the phonon spectrum to calculate the Grüneisen constant, volume coefficient of thermal expansion, Debye temperature, and temperature dependence of the heat capacity to estimate the melting temperature. Based on the RuAl alloy, the bulk moduli of the elasticity and equilibrium values of lattice parameters were calculated. The simulated results showed good agreement with the experimental data. The calculated parameters of RuAl were compared with those of the NiAl heat-resistant alloy. Using these results, we presented a method for selecting an alloy based on the replacement of ruthenium with nickel in the RuAl alloy. Selection was performed by analyzing the bulk modulus of elasticity and the electron structure of the Ru(Ni)Al alloy.

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29

Evdokimov, V. B., A. A. Artamonov, E. V. Plotnikov e N. A. Konstantinova. "RESOURCE-EFFICIENT METHODS FOR PREDICTING AND SELECTING HEAT-RESISTANT ALLOYS". Resource-Efficient Technologies, n. 2 (11 luglio 2019): 17–28. http://dx.doi.org/10.18799/24056529/2019/2/233.

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Abstract (sommario):

The power plant resource efficiency is largely dependent on heat-resistant alloys and is limited by the standard turbine operating temperature, which is slightly greater than 1000°C. These temperature limits are dependent on the characteristics of the heat-resistant alloys used in power plants. The current research aimed to discover new heat-resistant alloys using computer-based models to simulate the various properties of such materials. The first-principle methods were initially used in this study. These methods can determine the most important properties of alloys with a high degree of accuracy. This study presented an overview of the software used for first-principle simulation. Using RuAl as the demonstration alloy in this study, we provided step-by-step instructions on how to effectively study the properties of the heat-resistant alloys. Using the first-principle methods, the phonon spectrum and density of the phonon states of B2 RuAl were assessed. We use the parameters of the phonon spectrum to calculate the Grüneisen constant, volume coefficient of thermal expansion, Debye temperature, and temperature dependence of the heat capacity to estimate the melting temperature. Based on the RuAl alloy, the bulk moduli of the elasticity and equilibrium values of lattice parameters were calculated. The simulated results showed good agreement with the experimental data. The calculated parameters of RuAl were compared with those of the NiAl heat-resistant alloy. Using these results, we presented a method for selecting an alloy based on the replacement of ruthenium with nickel in the RuAl alloy. Selection was performed by analyzing the bulk modulus of elasticity and the electron structure of the Ru(Ni)Al alloy.

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30

Glotka, O. A., e V. Yu Olshanetskii. "Predicting the properties of nickel-based superalloys directional crystallization". Metaloznavstvo ta obrobka metalìv 99, n. 3 (30 settembre 2021): 15–22. http://dx.doi.org/10.15407/mom2021.03.015.

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Abstract (sommario):

The aim of this work is to obtain predictive regression models, with which it is possible to adequately calculate the mechanical properties of heat-resistant nickel alloys, without prior experiments. Industrial alloys of directional crystallization of domestic and foreign production were selected for research. The values were processed by the method of least squares to obtain correlations with the receipt of mathematical equations of regression models that optimally describe these dependencies. As a result of processing of experimental data, the ratio of alloying elements which can be used for an estimation of mechanical properties taking into account complex influence of the main components of an alloy is offered for the first time. Since the dimensional mismatch of the lattice parameters is associated with the degree of concentration of solid-soluble hardening of γ- and γ'-phases, the efficiency of dispersion hardening of the alloy, creep rate and other properties, the obtained ratio allows to link these properties with multicomponent systems. Regression models are presented, with the help of which it is possible to calculate dimensional mismatch, strength, heat resistance, number of  phases and density of alloys with high accuracy. The regularities of the composition influence on the properties of heat-resistant nickel alloys of directional crystallization are established. It is shown that for multicomponent nickel systems it is possible to predict with high probability misfit, which significantly affects the strength characteristics of alloys of this class. The decrease in the value of misfit is accompanied by an increase in the solubility of the elements in the -solid solution at a value of the ratio of alloying elements of 1.5 - 1.6. However, an increase in the ratio of alloying elements greater than 2 is accompanied by an increase in misfit, because the -solid solution has reached a maximum of dissolution. The perspective and effective direction in the decision of a problem of forecasting of the basic characteristics influencing a complex of service properties of alloys both at development of new heat-resistant nickel alloys, and at perfection of structures of known industrial marks of this class is shown. Keywords: nickel-based superalloys, dimensional mismatch (γ / γ'- mismatch), strength, heat resistance.

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31

Batako, Andre, Anatoliy Matveevich Adaskin, Victor Nikolaevich Butrim, Alexey Anatolevich Vereschaka e Anatoliy Stepanovich Vereschaka. "Influence of Carbide Substrate Properties on Wear Resistance of Tool with Multilayer Coating in Machining of Chromium-Based Heat-Resistant Alloy". Materials Science Forum 876 (ottobre 2016): 59–68. http://dx.doi.org/10.4028/www.scientific.net/msf.876.59.

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Thispaper presents the results of the studies of the combined influence of properties of carbide substrate and composite coatings on tool wear resistance in machining of chromium-based heat-resistant alloys. It was established that the efficiency of carbide tools with coatings is determined by a combination of the properties of the carbide substrate and the coating itself. For carbides with relatively low strength and crack resistance, the efficiency of coatings appeared to be unsatisfactory because of brittle fracture of the substrate and thus intensive failure of coating. High heat resistance of cobalt-rhenium alloy is not realized during deposition of coating because of blocking of the most important property of heat-resistant Co/Re binder, i.e. the ability to hold carbide grains under significant deterioration of carbide matrix even at a high temperature in the cutting zone.The maximum efficiency of the coating in machining of chromium-based heat-resistant alloy is provided withcarbide tools made with a balanced ratio of hardness, heat resistance and strength.

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32

Kvasnytska, Y. H., I. A. Shalevska, A. I. Balitskii, L. M. Ivaskevich, І. І. Maksiuta e K. H. Kvasnytska. "Influence of Refractory Elements on Phase–Structural Stability of Heat-Resistant Corrosion-Resistant Alloys for Gas Turbine Blades". METALLOFIZIKA I NOVEISHIE TEKHNOLOGII 45, n. 8 (1 febbraio 2024): 975–92. http://dx.doi.org/10.15407/mfint.45.08.0975.

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33

Balitskii, Alexander I., Yuliia H. Kvasnytska, Lyubomir M. Ivaskevych, Kateryna H. Kvasnytska, Olexiy A. Balitskii, Inna A. Shalevska, Oleg Y. Shynskii, Jaroslaw M. Jaworski e Jakub M. Dowejko. "Hydrogen and Corrosion Resistance of Nickel Superalloys for Gas Turbines, Engines Cooled Blades". Energies 16, n. 3 (20 gennaio 2023): 1154. http://dx.doi.org/10.3390/en16031154.

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Abstract (sommario):

The paper presents the results of the analysis of the resistance to hydrogen and high-temperature salt corrosion of the developed alloy of the CM88Y type for the turbine blades of gas turbine engines for marine and power purposes in comparison with the industrial heat-resistant corrosion-resistant alloy CM88Y and the alloy for the protective coating of the SDP3-A blades. SDP3-A alloy was chosen as a reference sample, which has high hydrogen and corrosion resistance. The new heat-resistant alloy additionally contains such refractory metals as rhenium and tantalum, which are added to the composition of the alloy in order to increase operational characteristics while maintaining phase-structural stability. These are properties such as long-term and fatigue strength, characteristics of plasticity and strength at room and elevated temperatures. Therefore, the purpose of these studies was to determine the resistance to high-temperature salt corrosion of the developed alloy in comparison with the industrial heat-resistant nickel alloy and to evaluate the influence of alloying, hydrogen embrittlement of CM88Y and ZhS3DK alloys with different contents of chromium, boron, zirconium, hafnium, and yttrium were compared. The corrosion resistance of the materials was evaluated after crucible tests in a salt solution at a temperature of 900 °C for 30 h, according to the standard method. The corrosion resistances of alloys were determined by the mass loss, corrosion rate, and data from metallographic studies.

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34

Калініна, Наталія Євграфівна, Олександр Васильович Калінін, Тетяна Валеріївна Носова, Стелла Ігорівна Мамчур e Наталія Іванівна Цокур. "Розробка технології дисперсного модифікування жароміцних нікелевих сплавів для лопаток газотурбінних двигунів". Aerospace technic and technology, n. 3 (27 maggio 2021): 49–53. http://dx.doi.org/10.32620/aktt.2021.3.06.

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Abstract (sommario):

The paper proposes means of improving the properties of nickel alloys for aircraft gas turbine engines by improving the existing alloys. The efficiency of an aircraft engine depends on the quality of the turbine rotor blades, which are made of heat-resistant alloys. According to the studies, the obtained results of pilot tests of a complex of mechanical properties, high-temperature corrosion of a multicomponent high-temperature nickel alloy ХН59МВТКЮЛ (Ni-Cr-W-Co-Al-Ti-Mo systems). The paper proposes the use of modifiers. An effective means of dispersing the structural components of alloys at the macro and micro levels is the modification of multicomponent alloys with dispersed and nano dispersed compositions. Based on titanium nitride powder, a technological regime for modifying nickel melt with dispersed compositions of plasma chemical synthesis has been developed. The modifier was used in tablet form. Investigated different dosages of the modifier: 0.1…0.03 % by weight. The proposed method allows, with minimal losses at the melting stage, to introduce the required amount of modifier. The temperature and time parameters of the modification are 16500С, the modifier action time is 5…7 minutes. Investigations of the complex mechanical properties and the peculiarities of the formation of the structure of the modified alloy have been carried out. According to the research results, significant refinement of the alloy grain was obtained in comparison with the initial state. The modification led to an increase in mechanical properties: strength by 10 %, impact strength by 35...40 %. Comparison of the nano-modified alloy with the obtained one made it possible to increase the corrosion resistance of the ХН59МВТКЮЛ alloy in an oxidizing environment. At a temperature of 1000 0С, the corrosion depth decreased by 15 %. An increase in resistance to high-temperature corrosion is associated with a more uniform distribution of excess phases in the structure of the modified alloy. The mechanism of action of refractory particles of a modifier in a nickel melt, which are the nuclei of primary crystallization, has been established. The results of the work are of practical value in the manufacture of rotor blades from high-quality heat-resistant nickel alloys with increased parameters of heat resistance and heat resistance.

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35

Getsov, L. B., A. I. Rybnikov e A. S. Semenov. "Thermal fatigue strength of heat-resistant alloys". Thermal Engineering 56, n. 5 (maggio 2009): 412–20. http://dx.doi.org/10.1134/s0040601509050103.

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36

Schroth, James G., e Vjekoslav Franetovic. "Mechanical Alloying for Heat-Resistant Copper Alloys". JOM 41, n. 1 (gennaio 1989): 37–39. http://dx.doi.org/10.1007/bf03220801.

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37

Calmunger, Mattias, Hugo Wärner, Guocai Chai e Mikael Segersäll. "Thermomechanical Fatigue of Heat Resistant Austenitic Alloys". Procedia Structural Integrity 43 (2023): 130–35. http://dx.doi.org/10.1016/j.prostr.2022.12.247.

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38

Kalienko, M. S., A. A. Popov, A. V. Volkov, M. O. Leder e A. V. Zhelnina. "Fatigue Resistance of the Sheets of Heat-Resistant Titanium Alloys". Physics of Metals and Metallography 125, n. 3 (marzo 2024): 332–39. http://dx.doi.org/10.1134/s0031918x23603141.

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39

Tsukeda, Tadayoshi, Ken Saito, Mayumi Suzuki, Junichi Koike e Kouichi Maruyama. "Newly Developed Heat Resistant Magnesium Alloy by Thixomolding^®". Materials Science Forum 488-489 (luglio 2005): 287–90. http://dx.doi.org/10.4028/www.scientific.net/msf.488-489.287.

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Abstract (sommario):

We compared the newly developed heat resistant magnesium alloy with conventional ones by Thixomolding® and aluminum alloy by die casting. Tensile properties at elevated temperatures of AXEJ6310 were equal to those of ADC12. In particular, elongation tendency of AXEJ6310 at higher temperature was better than those of the other alloys. Creep resistance of AXEJ6310 was larger than that of AE42 by almost 3 orders and smaller than that of ADC12 by almost 2 orders of magnitude. Fatigue limits at room temperature and 423K of AXEJ6310 was superior among conventional magnesium alloys.

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40

Povarova, K. B., A. E. Morozov, A. A. Drozdov, A. V. Antonova e M. A. Bulakhtina. "Heat-Resistant RuAl-Based Alloys: III. Powder Alloys—Mechanical Alloying". Inorganic Materials: Applied Research 13, n. 2 (aprile 2022): 294–305. http://dx.doi.org/10.1134/s2075113322020344.

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41

Povarova, K. B., A. E. Morozov, A. A. Drozdov, A. V. Antonova e M. A. Bulakhtina. "Heat-resistant RuAl-based alloys. III. Powder alloys — mechanical alloying". Perspektivnye Materialy 11 (2021): 5–19. http://dx.doi.org/10.30791/1028-978x-2021-11-5-19.

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Abstract (sommario):

Refractory (Tmelt = 2100 °C), heat-resistant ruthenium monoaluminide RuAl, lighter (ρ = 7.97 g/cm3) than Ni superalloys, is considered as a promising candidate material for operation at high temperatures and relatively low loads in high-speed gas oxidizing flows at temperatures higher not only operating temperatures, but also the melting temperatures of both nickel superalloys and nickel and titanium aluminides. RuAl is also an ideal candidate for potential protective coatings. In the first part of the article, RuAl-based cast alloys were considered. In the second part of the article, the possibilities of obtaining alloys based on RuAl directly from the initial powders of ruthenium and aluminum are considered by combining the temperature-time regimes of reaction alloy formation (RA), the sequence and intensity of pressure application during RA. The third part of the article is devoted to studying the possibilities of using powders doped with RuAl (NiAl, TiAl) of a given composition, obtained by mechanical alloying, as a starting material.

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42

Petukhov, G. D., e V. F. Makarov. "Behavior of heat-resistant alloys and titanium alloys on cutting". Russian Engineering Research 36, n. 9 (settembre 2016): 741–44. http://dx.doi.org/10.3103/s1068798x16090173.

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43

Ternovyi, Yu F., S. A. Vodennikov e O. S. Vodennikova. "Inert gas absorption and pore formation in nickel-based hot-melt alloys". Metaloznavstvo ta obrobka metalìv 97, n. 1 (15 marzo 2021): 20–27. http://dx.doi.org/10.15407/mom2021.01.020.

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Abstract (sommario):

An integrated approach to the generalization and analysis of scientific and technical literature in the direction of improving the technological processes of spraying metal melts used a comprehensive approach The processing and analysis of experimental data for the determination of argon at different stages of heat-resistant alloy production were performed. Micro structural analysis of nickel-based heat-resistant alloys obtained by gas and centrifugal spraying was performed. A significant increase in the mass fraction of argon in the melt is shown when held in a furnace before gas or centrifugal spraying, the absence of capture of inert gas by sprayed liquid particles during centrifugal spraying is shown, unlike the process of gas spraying, it is shown. The results of the study indicate the absence of "dissolution" of Ar or a mixture of Ar-He in the liquid or solid state at argon levels up to 1 • 10-4% of the mass. It is established that centrifugal spraying of metal melts allows obtaining compact powders with small particle size distribution at relatively low energy consumption. It is also noted that argon is captured by the metal only in the process of moving on the disk, and not due to the weak dynamic gas interaction directly on the melt droplets. Hence, its amount in the metal increases after the argon’s injection into the furnace chamber and at the subsequent centrifugal spraying does not change, in comparison with gas spraying. A technological possibility has been found to significantly reduce the amount of gas pores and the mass fraction of inert gas in nickel-based heat-resistant alloys. Nickel-based heat-resistant alloys obtained by the method of gas and centrifugal spraying make it possible to improve the quality of products for the aviation industry, their reliability when operating in extreme conditions. Keywords: gas spraying, centrifugal spraying, heat-resistant alloy, argon, helium, pore formation.

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44

Veselkov, Sergey, Olga Samoilova, Nataliya Shaburova e Evgeny Trofimov. "High-Temperature Oxidation of High-Entropic Alloys: A Review". Materials 14, n. 10 (16 maggio 2021): 2595. http://dx.doi.org/10.3390/ma14102595.

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Abstract (sommario):

Over the past few years, interest in high-entropic alloys (HEAs) has been growing. A large body of research has been undertaken to study aspects such as the microstructure features of HEAs of various compositions, the effect of the content of certain elements on the mechanical properties of HEAs, and, of course, special properties such as heat resistance, corrosion resistance, resistance to irradiation with high-energy particles, magnetic properties, etc. However, few works have presented results accumulated over several years, which can complicate the choice of directions for further research. This review article presents the results of studies of the mechanisms of high-temperature oxidation of HEAs of systems: Al-Co-Cr-Fe-Ni, Mn-Co-Cr-Fe-Ni, refractory HEAs. An analysis made it possible to systematize the features of high-temperature oxidation of HEAs and propose new directions for the development of heat-resistant HEAs. The presented information may be useful for assessing the possibility of the practical application of HEAs in the aerospace industry, in nuclear and chemical engineering, and in new areas of energy.

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45

Gubanov, O. M., V. N. Gadalov, Yu V. Skripkina e I. A. Makarova. "Increasing the heat resistance of cast nickel-based complex alloyed alloys due to the influence of the redistribution of alloying elements between the γ-solid solution and the strengthening intermetallic γ'-phase". Glavnyj mekhanik (Chief Mechanic), n. 12 (1 dicembre 2020): 67–79. http://dx.doi.org/10.33920/pro-2-2012-07.

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Abstract (sommario):

The analysis of alloying of the chemical and phase composition of domestic and foreign cast heat-resistant alloys with a nickel matrix is carried out; the tendency to increase the level of heat-resistant properties of cast nickel alloys due to more complex alloying is traced. Recently, expensive rhenium, ruthenium, hafnium, and dysprosium have increasingly been used as alloying elements. The positive effect of these elements on the thermal stability of the γ-matrix and the strengthening γ'-phase is established. The above elements inhibit diffusion processes, thereby increasing the creep resistance of alloys at high temperatures and loads. The evaluation of heatresistant nickel alloys obtained by directional crystallization is given. It is established that the most significant parameters of the phase composition of the studied alloys are the distribution coefficients of alloying elements between the γ' and γ-phases (Ki). The basic principles of balanced alloying, which are used to select the optimal chemical composition of heat-resistant nickel alloys, are formulated. To achieve the maximum heat resistance parameters in the selected heat-resistant nickel alloys alloying system, the calculated value γ/γ' defined by “misfit” was used, which is calculated by the formula: Δа = (аγ-аγ')/ аγ, where аγ and аγ' are the lattice periods of γ and γʹ-phases. Thus, the calculated Δа should be positive for аγ> аγ' and at least two to three times more than for single-crystal heat-resistant nickel alloys with a traditional alloying system, for which Δа = (0.1-0.2) or more. It is shown that misfit (γ/γ') is mainly determined by those alloying elements that increase the аγ most significantly. These elements are Re, Pu, Mo, W, Nb, and Ta in ascending order of influence on the lattice period (аγ) of the phase.

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46

Kalashnikov, V. S., L. P. Reshetilo, O. V. Chuchman e S. A. Naprienko. "STRENGTH AND RELIABILITY OF RODS AND ROTOR BLADE STAMPS MADE OF HEAT-RESISTANT INDUSTRIAL TITANIUM ALLOYS AND MODERN PSEUDO-α-TITANIUM ALLOY". Proceedings of VIAM, n. 2 (2022): 13–31. http://dx.doi.org/10.18577/2307-6046-2022-0-2-13-31.

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Abstract (sommario):

Presents the microstructure and mechanical properties of bars and blade forgings made of new heat resistant titanium alloy. A typical microstructures of studied industrial alloys were demonstrated. The main clue of the article is noted to fatigue stability of bars and forgings material. The analysis of strength and impact toughness of bars and blade forgings made of industrial titanium alloys VT3-1, VT8, VT8M-1, VT9, VT20 were carried out in comparison with new heat-resistant titanium near- alloy.

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47

Blinov, V. M., I. O. Bannykh e T. N. Zvereva. "High-plasticity heat-resistant 03Kh14G16N6Yu-type steels with heat-and deformation-resistant austenite". Russian Metallurgy (Metally) 2008, n. 4 (agosto 2008): 329–35. http://dx.doi.org/10.1134/s0036029508040101.

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48

Akhmetov, Dr Sairanbek, e Dr Anarbay Kudaykulov. "On the Method of Construction of the Dependence of the Heat Extension Coefficient on Temperature in Heat-resistant Alloys". International Journal of Engineering Research and Science 3, n. 8 (31 agosto 2017): 20–29. http://dx.doi.org/10.25125/engineering-journal-ijoer-aug-2017-4.

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49

Butrim, V. N., A. M. Adaskin, V. V. Kashirtsev e A. S. Trushnikovа. "Effect of tungsten on structure of chromium-based heat-resistant alloys". Voprosy Materialovedeniya, n. 3(115) (14 ottobre 2023): 96–106. http://dx.doi.org/10.22349/1994-6716-2023-115-3-96-106.

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Abstract (sommario):

The effect of tungsten on the structure and properties of Cr–32Ni–W alloys was studied. Characteristic tungsten concentrations were separated: up to 3%, 3–10%, and more than 10%, which determine the structure of the alloys. The mechanical properties of the alloys are determined. The area of rational application of the alloy Cr–32Ni–W is shown.

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50

Тyagunov, A. G., Е. Е. Baryshev, G. V. Tyagunov, Т. K. Кostina e K. Yu Shmakova. "USING MELT HIGH-TEMPERATURE TREATMENT FOR PROCESSING FOUNDRY WASTES OF HEAT-RESISTANT ALLOY". Izvestiya. Ferrous Metallurgy 62, n. 3 (20 giugno 2019): 222–27. http://dx.doi.org/10.17073/0368-0797-2019-3-222-227.

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Abstract (sommario):

At present time, metallurgical wastes are used in metallurgical alloys production more and more. The volume accumulation and increase of return age effect on charge pollution by undesirable elements and nonmetallic inclusions. As a result, structure and properties of the casting inevitably get worse. This circumstance must influence on polytherm’s character of physical properties of the melt, necessary temperature and time parameters of the heat-resistant alloy’s melting accordingly. We have researched the temperature dependences of electrical resistance and kinematic viscosity of liquid heat-resistant composites based оn Ni – Nb – Cr – Mo systems. The critical temperatures were determined for the EP902 alloy. Heating up to these temperatures leads to irreversible changes in direction of the melt improving. Interaction was found between the amount of foundry waste and features of temperature dependences of the melt physico-chemical properties. An increase in the amount of foundry waste using in remelting results in the critical temperatures increasing. Influence of the melt conditions on crystallization process and on the structure of hard metal has been studied. The process of alloy EР902 solidification was researched by differential thermal analysis method. It has shown that the crystallization process starts with extraction of solid solution on the base of γ-phases and ends with forming of the eutectic based on the Ni3Nb intermetallic compound. Heating of the melt over the critical temperature leads to an increase of supercooling and does not effect on the eutectic temperature. The processing mode of the high temperature melt treatment was proposed based on the research results of physico-chemical properties of the liquid metal and process of the melt crystallization. It allows obtaining the highest quality of casting of heat-resistant EР902 alloy, which contains significant amount of foundry waste in the charge. The mechanical tests were implemented for experimental samples melted out by the optimal mode of high-temperature melt treatment (HTTM). Application of HTTM for the melts, contained 50 % of foundry waste in charge, allows obtaining the level of strength and plastic properties exceeding the technical requirements, stabilizing and combining it from melt to melt.

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