Gotowe bibliografie tematyczne / Tungsten free Cobalt based superalloys

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Gotowa bibliografia na temat „Tungsten free Cobalt based superalloys”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 7 września 2023

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Artykuły w czasopismach na temat "Tungsten free Cobalt based superalloys"

Moskal, Grzegorz. "Oxidation behavior of Co-Al-Mo-Nb and Co-Ni-Al-Mo-Nb new tungsten-free y-y' cobalt-based superalloys". OCHRONA PRZED KOROZJĄ 1, nr 9 (5.09.2017): 28–32. http://dx.doi.org/10.15199/40.2017.9.5.

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Makineni, S. K., B. Nithin i K. Chattopadhyay. "Synthesis of a new tungsten-free γ–γ′ cobalt-based superalloy by tuning alloying additions". Acta Materialia 85 (luty 2015): 85–94. http://dx.doi.org/10.1016/j.actamat.2014.11.016.

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Wang, Zihan, Jianxin Zhang, Youjian Zhang, Huixin Jin i Wenyang Zhang. "First-Principles Study of a Tungsten-Free γ–γ′ Co–Al–Mo–Nb Class Cobalt-Based Superalloy and the Alloying Effect of Ti Addition". Journal of the Physical Society of Japan 89, nr 12 (15.12.2020): 124714. http://dx.doi.org/10.7566/jpsj.89.124714.

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Leni, Desmarita, Yuda Perdana Kusuma, Muchlisinalahuddin Muchlisinalahuddin, Ruzita Sumiati i Hendri Candra Mayana. "THE IMPLEMENTATION OF PANDAS PROFILING AS A TOOL FOR ANALYZING MECHANICAL PROPERTIES DATA OF NICKEL-BASED SUPERALLOYS BASED ON ALLOY CHEMICAL COMPOSITION". International Journal of Innovation in Mechanical Engineering and Advanced Materials 4, nr 3 (31.05.2023): 86. http://dx.doi.org/10.22441/ijimeam.v4i3.19439.

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The purpose of this study is to evaluate the mechanical properties of nickel-based superalloys with variations in alloy chemical compositions using the Exploratory Data Analysis (EDA) method with the assistance of the pandas profiling library on Google Colab. In this study, data from 312 tensile tests of nickel-based superalloys were used as research samples, with alloy chemical compositions including carbon (C), manganese (Mn), silicon (Si), chromium (Cr), nickel (Ni), molybdenum (Mo), vanadium (V), nitrogen (N), niobium (Nb), cobalt (Co), tungsten (W), aluminum (Al), and titanium (Ti), as well as mechanical properties such as yield strength (YS), tensile strength (TS), and elongation (EL). The methodology used in this study was the EDA method with the assistance of the pandas profiling library on Google Colab, which enables the automatic creation of a dataset report, presenting information on various aspects such as data structure, descriptive statistics, correlation, distribution, and missing values. The results show that yield strength has a fairly high correlation with titanium (0.51), medium correlations with nickel (0.25), vanadium (0.2), and cobalt (0.2). Tensile strength in nickel-based superalloys has a fairly high correlation with yield strength (0.88), carbon (0.49), and cobalt (0.55), and medium correlations with titanium (0.25) and vanadium (0.25). Elongation in nickel-based superalloys has a negative and fairly high correlation with tensile strength (-0.62) and yield strength (-0.58). Some warnings for missing data and zero values in some variables were identified. These results indicate that the pandas profiling library can be used as a tool to analyze the data of mechanical properties of nickel-based superalloys quickly and easily, and provide clear information on data patterns, data structure, and correlation among data.

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Helbig, Christoph, Alex M. Bradshaw, Andrea Thorenz i Axel Tuma. "Supply Risk Considerations for the Elements in Nickel-Based Superalloys". Resources 9, nr 9 (31.08.2020): 106. http://dx.doi.org/10.3390/resources9090106.

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Nickel-based superalloys contain various elements which are added in order to make the alloys more resistant to thermal and mechanical stress and to the adverse operating environments in jet engines. In particular, higher combustion temperatures in the gas turbine are important, since they result in higher fuel efficiency and thus in lower CO2 emissions. In this paper, a semi-quantitative assessment scheme is used to evaluate the relative supply risks associated with elements contained in various Ni-based superalloys: aluminium, titanium, chromium, iron, cobalt, niobium, molybdenum, ruthenium, tantalum, tungsten, and rhenium. Twelve indicators on the elemental level and four aggregation methods are applied in order to obtain the supply risk at the alloy level. The supply risks for the elements rhenium, molybdenum and cobalt are found to be the highest. For three of the aggregation schemes, the spread in supply risk values for the different alloy types (as characterized by chemical composition and the endurance temperature) is generally narrow. The fourth, namely the cost-share’ aggregation scheme, gives rise to a broader distribution of supply risk values. This is mainly due to the introduction of rhenium as a component starting with second-generation single crystal alloys. The resulting higher supply risk appears, however, to be acceptable for jet engine applications due to the higher temperatures these alloys can endure.

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Bocchini, Peter J., Chantal K. Sudbrack, Daniel J. Sauza, Ronald D. Noebe, David N. Seidman i David C. Dunand. "Effect of tungsten concentration on microstructures of Co-10Ni-6Al-(0,2,4,6)W-6Ti (at%) cobalt-based superalloys". Materials Science and Engineering: A 700 (lipiec 2017): 481–86. http://dx.doi.org/10.1016/j.msea.2017.06.018.

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Singh, Mahander Pratap, Emmanuel Femi Olu, Prafull Pandey i Kamanio Chattopadhyay. "Thermophysical and magnetic properties of Co-Ni-Mo-Al-Ta class of tungsten free Co-based superalloys". Journal of Alloys and Compounds 879 (październik 2021): 160379. http://dx.doi.org/10.1016/j.jallcom.2021.160379.

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Migas, Damian, Grzegorz Moskal i Tomasz Maciąg. "Thermal analysis of W-free Co–(Ni)–Al–Mo–Nb superalloys". Journal of Thermal Analysis and Calorimetry 142, nr 1 (24.02.2020): 149–56. http://dx.doi.org/10.1007/s10973-020-09375-7.

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Abstract In this investigation, the thermal analysis of W-free cobalt-based superalloys based on Co–Al–Mo–Nb and Co–Ni–Al–Mo–Nb systems was performed. The analysis was performed at different stages of heat treatment process. The differential thermal analysis (DTA) was utilized for the determination of characteristic temperatures related to microstructural changes. First of all, the DTA analysis was carried out for discussing as-cast alloys in the temperature range of 40–1500 °C. The results showed thermal effects connected with melting and important order–disorder transition. The temperature range of 1200–1250 °C was chosen for performance of a first heat treatment operation for the investigated alloys. Specimens were annealed at selected temperature for 5 h. The microstructure of alloys after solution heat treatment was analyzed as well. Afterward, the solutionized specimens were subjected to the further thermal analysis in order to select the aging temperature according to the order–disorder transformation related to formation of γ′ phase with overall formula Co3(Al,X). Five aging variants were performed in the temperature range of 800–1000 with a step of 50 °C. After each stage of heat treatment, SEM/EDS analysis and hardness measurements were performed.

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Wang, Zhenhua, Jiheng Jia, Liyan Cao, Ning Sun i Yulin Wang. "Microstructure and Mechanical Properties of Spark Plasma Sintered Si3N4/WC Ceramic Tools". Materials 12, nr 11 (10.06.2019): 1868. http://dx.doi.org/10.3390/ma12111868.

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Silicon nitride (Si3N4) based ceramic tools exhibit good machinability in cutting materials such as gray cast iron, ductile iron, malleable cast iron, and superalloys due to excellent high-temperature mechanical properties. In this paper, high-performance Si3N4-based ceramic tools containing tungsten carbide (WC) and cobalt (Co) were studied. Effects of the WC content and Co content on mechanical properties and a microstructure of Si3N4-based ceramic materials were analyzed. Results showed that Si3N4-based ceramic material containing 10 wt % WC and 1 wt % Co had the best comprehensive mechanical properties at a sintering temperature of 1650 °C and holding time of 6 min, achieving Vickers hardness, fracture toughness, and room temperature bending strength of 16.96 GPa, 7.26 MPa·m1/2, and 1132 MPa, respectively. The microstructure of Si3N4-based ceramic tool material is uniform without obvious abnormal growth. The Si3N4-based ceramic tool was mainly composed of α-Si3N4, β-Si3N4, and WC phases.

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Yui, Akinori, Takayuki Kitajima, Peter Krajnik, Katsuko Harano, Hitoshi Sumiya i Hajime Ono. "Effect of Cutting Fluid on Diamond Tool Life under Micro V-Groove Turning of Cobalt-Free Tungsten Carbide". Advanced Materials Research 1017 (wrzesień 2014): 181–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1017.181.

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Micro-machining of hard dies and molds for optical parts or precision instruments is required to extend die and mold life. This paper investigates the effect of cutting fluid on diamond tool life under micro V-groove turning of cobalt-free tungsten carbide. Zinc dialkyldithiophosphate fluid (ZnDTP) displayed excellent diamond tool wear resistance in previous experiments. The performance of this cutting fluid is compared to newly developed vegetable oil based cutting fluid with dispersed MoS2 nanotubes. This paper investigates nanopolycrystalline diamond (NPD) tool life with a rake angle of 0° and-30° under continuous micro V-groove turning (i.e. face turning), of cobalt-free tungsten carbide using the developed cutting fluids. Superior diamond tool edge wear resistance is observed when using the dispersed MoS2 nanotubes in vegetable oil and using a NPD tool with a-30° rake angle.

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Rozprawy doktorskie na temat "Tungsten free Cobalt based superalloys"

Sharma, Abhishek. "An Evaluation of the Mechanical Behavior of some new High Temperature Materials". Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5254.

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Two new high-temperature alloy systems have been discovered recently at the Indian Institute of Science, which form the basis of this thesis. The first alloy system is an Intermetallic-Intermetallic eutectic composite alloy in the nickel-rich end of the Ni-Al- Zr ternary system, first reported by Tiwary et al. These eutectic composites have very impressive room temperature yield strengths of about 2 GPa which are retained till about 700 . Coupled with 2 to 5% tensile plasticity at room temperature, excellent high-temperature oxidation resistance, good long-term microstructural stability and very low densities of about 7.35–7.95 gm/cm3, these materials are exciting candidates for high-temperature applications. The second alloy system comprises of Tungsten free Cobalt based superalloys having the classical − 0 microstructure similar to that of nickel-based superalloys as described by Makineni et al. The presence of the L12 phase in cobalt-based systems was reported by Lee et al. and Sato et al. where the addition of 25 wt.% tungsten seemed to stabilize the metastable Co3Al. This however pushed the density of the alloy to about 9–10 gm/cm3, making it too heavy for most high-temperature applications. A large body of work followed trying to reduce or eliminate the presence of tungsten in these alloys. The new alloys by Makineni et al. do not contain tungsten which reduces the density to about 8.0–8.4 gm/cm3. The high-temperature mechanical behavior of some of the alloys from these two sysi tems has been evaluated in the current thesis. This thesis is divided into six chapters.

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Streszczenia konferencji na temat "Tungsten free Cobalt based superalloys"

Scheib, Christopher M., Raymond K. Newswanger, Allison M. Beese, Timothy Bowen, Gregory S. Lewis, Evan P. Roush, Choon-Sik Jhun, William J. Weiss i Gerson Rosenberg. "Finite Element Analysis on Stellite 17mm Tube Valve for Pediatric Ventricular Assist Device". W 2017 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dmd2017-3331.

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A Stellite 25 17mm tube valve based upon the Björk-Shiley Monostrut (BSM) valve design was developed for use in the Penn State Pediatric Ventricular Assist Device (PVAD) pump [1]. The hook of the valve was designed to hold a Delrin occluding disc in place while allowing the disc to tilt open 70 degrees from the closed position. Unlike common design constraints which remain in the elastic region, the hook experiences plastic deformation twice during the assembly process, making the material choice of Stellite 25 imperative. Stellite 25 is a cobalt-chromium-tungsten-nickel alloy (Co-20Cr-15W-10Ni) belonging to the material family of superalloys which are commonly used for wear-resistant applications exposed to heat, abrasion, and galling [2, 3]. Along with its excellent in vivo corrosion resistance [4], Stellite 25 exhibits high strength and ductility which permit the hook to be plastically deformed during disc installation while remaining below the strain to failure [3, 4]. Together these qualities make Stellite 25 an ideal material choice for the 17mm tube valve application. Predicting the resultant stresses and strains is critical for determining the safety and structural reliability of the Stellite 25 17mm tube valve for the PVAD after assembly. After performing finite element analysis (FEA), the simulation results were validated by deflection experiments and metallurgical investigations.

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Stender, Michael E., Lauren L. Beghini, Michael G. Veilleux, Samuel R. Subia i Joshua D. Sugar. "Thermal Mechanical Finite Element Simulation of Additive Manufacturing: Process Modeling of the Lens Process". W ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65992.

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Laser engineered net shaping (LENS) is an additive manufacturing process that presents a promising method of creating or repairing metal parts not previously feasible with traditional manufacturing methods. The LENS process involves the directed deposition of metal via a laser power source and a spray of metal powder co-located to create and feed a molten pool (also referred to generically as Directed Energy Deposition, DED). DED technologies are being developed for use in prototyping, repair, and manufacturing across a wide variety of materials including stainless steel, titanium, tungsten carbide-cobalt, aluminum, and nickel based superalloys. However, barriers to the successful production and qualification of LENS produced or repaired parts remain. This work proposes a finite element (FE) analysis methodology capable of simulating the LENS process at the continuum length scale (i.e. part length scale). This method incorporates an element activation scheme wherein only elements that exceed the material melt temperature during laser heating are activated and carried through to subsequent analysis steps. Following the initial element activation calculation, newly deposited, or activated elements and the associated geometry, are carried through to thermal and mechanical analyses to calculate heat flow due to radiation, convection, and conduction as well as stresses and displacements. The final aim of this work is to develop a validated LENS process simulation capability that can accurately predict temperature history, final part shape, distribution of strength, microstructural properties, and residual stresses based on LENS process parameters.

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De Palo, S., M. Mohanty, H. Marc-Charles i M. Dorfman. "Fracture Toughness of HVOF Sprayed WC-Co Coatings". W ITSC 2000, redaktor Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0245.

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Abstract Tungsten carbide-cobalt coatings are extensively used to protect surfaces from wear in many types of applications, such as compressor piston rods, pump plungers, shaft sleeves on centrifugal pumps and fans, and midspans of compressor blades in gas turbines. The wear behavior in any application is strongly influenced by the basic physical and mechanical properties of such coatings. Fracture toughness as a mechanical property indicates the resistance to fracture in the presence of a sharp crack, and thus provides a measure of the intrinsic strength of the cemented carbides coatings. In this study, Vickers indentation tests have been used to quantify the in-plane fracture behavior of various WC-based coatings deposited by the High Velocity Oxy-Fuel (HVOF) spray process. The indentation cracks are analyzed in terms of standardized relations that utilize radial-median crack geometries. It is shown that the fracture properties of HVOF WC-Co coatings are anisotropic, and depend strongly on the microstructure and composition of the coatings. The crack propagation is determined by the porosity, binder mean free path, and the shape, size, and distribution of the reinforcing carbide particles. The erosion resistances of the coatings have also been discussed as a function of the fracture properties and mechanisms. It is shown, in this study, that the Vickers indentation method is a useful and convenient technique for determining the in-plane fracture toughness of HVOF sprayed WC-based coatings.

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