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Добірка наукової літератури з теми "Hastelloy X"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Hastelloy X"

1

Çakır, Fatih Hayati, Mehmet Alper Sofuoğlu, and Selim Gürgen. "Machining of Hastelloy-X Based on Finite Element Modelling." Advanced Engineering Forum 30 (November 2018): 1–7. http://dx.doi.org/10.4028/www.scientific.net/aef.30.1.

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Анотація:
Nickel-based alloys provide high corrosion resistance and high-temperature strength but these alloys possess poor machinability. Hastelloy-X is a nickel based alloy that has been used for high temperature use. There are many studies about finite element modeling of aerospace alloys but studies in literature with Hastelloy-X are limited. In the present work, machining characteristics of Hastelloy-X were investigated and a numerical model was developed for the turning operation of Hastelloy-X. Two input parameters (cutting speed and feed rate) were variated in the operations and the results were evaluated considering process outputs such as cutting forces, cutting temperature, effective stresses and chip morphology. Based on the verification of the numerical model using experimental results, presented material model is appropriate for the turning operation of Hastelloy-X at low and medium cutting speed machining conditions.
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2

Xie, Jilin, Yingche Ma, Meiqiong Ou, Weiwei Xing, Long Zhang, and Kui Liu. "Evaluating the Microstructures and Mechanical Properties of Dissimilar Metal Joints Between a New Cast Superalloy K4750 and Hastelloy X Alloy by Using Different Filler Materials." Materials 11, no. 10 (October 22, 2018): 2065. http://dx.doi.org/10.3390/ma11102065.

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Анотація:
Two kinds of filler materials were used to join dissimilar alloys between a new cast superalloy K4750 and Hastelloy X by tungsten gas arc welding (GTAW). The segregation behavior, interfacial microstructure and mechanical properties of the dissimilar joints were evaluated. The results show that both filler materials can be used to obtain sound dissimilar joints successfully. Microstructural observation show that no obvious cracking is observed in the joints achieved by both filler materials. The segregation extent of various elements in Hastelloy X weld metal is more severe than that in the K4750 weld metal. No unmixed zones were observed at the interfaces. Transition areas with the chemical compositions various between the K4750 alloy and the Hastelloy X alloy were found at the joint interfaces. The maximum width of the transition area between the K4750 weld metal and Hastelloy X base metal is smaller than that between the Hastelloy X weld metal and K4750 base metal. The ultimate tensile strength and yield strength of the joints with Hastelloy X filler material are slightly higher than those with K4750 filler material, however, the K4750 filler material results in a higher total elongation and fusion zone microhardness than those with Hastelloy X filler material. Both dissimilar joints fractured with a ductile feature which exhibits tearing edges and dimples. Hastelloy X filler material is suggested to be more suitable for joining of K4750 superalloy and Hastelloy X dissimilar metals in terms of obtaining superior comprehensive mechanical properties.
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3

Hussain, Zain, Zuhair Khan, Asghar Ali, Nisar Ahmad, Wajahat Qasim, and Altamash Shabbir. "Corrosion Behavior of MoSi<sub>2</sub> Coated Hastelloy X Utilized in Iodine -Sulfur Cycle for Hydrogen Production Application." Solid State Phenomena 336 (August 30, 2022): 35–41. http://dx.doi.org/10.4028/p-g30x7e.

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Анотація:
Molybdenum di silicide (MoSi2) has lower mismatch of coefficient of thermal expansion (CTE) with Hastelloy X as compare to silicon carbide. So, MoSi2 coatings can be a potential candidate to protect Hastelloy X against high temperature sulfuric acid. Herein, MoSi2 thin films were deposited via electron beam physical vapor deposition (EBPVD) method. Corrosion behavior of MoSi2 coated HX and bare HX was analyzed. Corrosion tests of bare Hastelloy X and coated samples was performed at different temperatures (60°C and 120°C) in 98% sulfuric acid using the weight-loss method. The morphology of pre and post corrosion test was also analyzed by using optical microscopy. Bare Hastelloy X showed a slight weight gain at 60°C and a weight loss at 120°C. The MoSi2 coated Hastelloy X showed slight weight gain at 60°C and a weight loss at 120 °C. The weight gain is the result of oxides formation whereas, weight loss may be attributed to corrosion due to H+ ions. These findings were also accompanied by optical microscopy as corroded and very rough patches were evident for bare HX, whereas, for MoSi2 coated samples, the coating was still intact.
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4

Wu, Horng Yu, Hsu Cheng Liu, Feng Jun Zhu, and Chui Hung Chiu. "Constitutive Analysis of Ni-Base Superalloy Hastelloy X under Hot Compression Based on Thermodynamics." Applied Mechanics and Materials 252 (December 2012): 73–76. http://dx.doi.org/10.4028/www.scientific.net/amm.252.73.

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Анотація:
Hot deformation characteristics of Hastelloy X Ni-base superalloy were investigated at elevated temperatures. Hot compressive tests were carried out in the temperature and strain rate ranges from 900 to 1150 °C and 0.001 to 1 s–1, respectively. The constitutive equation relating flow stress, temperature, and strain rate was obtained based on the peak stresses. The flow behavior showed that the softening mechanisms were related to the dynamic recovery (DRV) and dynamic recrystallization (DRX). The flow stress of Hastelloy X was fitted well by the constitutive equation of the hyperbolic sine function. The constitutive analysis suggested that the hot deformation mechanism of the Hastelloy X was dislocation creep.
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5

Zhang, Shuzhe, Yunpei Lei, Zhen Chen, Pei Wei, Wenjie Liu, Sen Yao, and Bingheng Lu. "Effect of Laser Energy Density on the Microstructure and Texture Evolution of Hastelloy-X Alloy Fabricated by Laser Powder Bed Fusion." Materials 14, no. 15 (July 31, 2021): 4305. http://dx.doi.org/10.3390/ma14154305.

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Анотація:
It is of great importance to study the microstructure and textural evolution of laser powder bed fusion (LPBF) formed Hastelloy-X alloys, in order to establish a close relationship between the process, microstructure, and properties through the regulation of the Hastelloy-X formation process parameters. In this paper, components of a Hastelloy-X alloy were formed with different laser energy densities (also known as the volume energy density VED). The densification mechanism of Hastelloy-X was studied, and the causes of defects, such as pores and cracks, were analyzed. The influence of different energy densities on grain size, texture, and orientation was investigated using an electron backscatter diffraction technique. The results show that the average grain size, primary dendrite arm spacing, and number of low angle grain boundaries increased with the increase of energy density. At the same time, the VED can strengthen the texture. The textural intensity increases with the increase of energy density. The best mechanical properties were obtained at the VED of 96 J·mm−3.
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6

Banoth, Santhosh, Thaviti Naidu Palleda, Sota Shimazu, and Koji Kakehi. "Yttrium’s Effect on the Hot Cracking and Creep Properties of a Ni-Based Superalloy Built Up by Additive Manufacturing." Materials 14, no. 5 (February 28, 2021): 1143. http://dx.doi.org/10.3390/ma14051143.

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Анотація:
We studied the effects of the rare earth element yttrium (Y) on the hot cracking and creep properties of Hastelloy-X processed by selective laser melting. We used two different alloys to study hot cracking in Hastelloy-X: one with 0.12 mass% yttrium added and one with no yttrium. Y-free Hastelloy-X exhibited less cracks, mainly due to the segregation of Si, W, and C resulting in SiC- and W6C-type carbides at the grain boundary and interdendritic regions. On the other hand, more cracks formed in the Y-added Hastelloy-X specimen because of segregation of Y, resulting in the formation of yttrium-rich carbide (YC). Post-heat treatment was conducted at 1177 °C for 2 h, followed by air cooling, to obtain good creep properties. We carried out a creep test along the vertical and horizontal directions. Despite having more cracks, the Y-added as-built Hastelloy-X specimen showed longer creep life and ductility than the Hastelloy-X specimen. This was mainly because of the formation of Y2O3 and SiO2 inside the grains. After solution treatment, the Y-added specimen’s creep life was eight times longer than that of the Y-free solution-treated specimen. This was mainly because of the maintenance of the columnar grain morphology even after solution treatment. In addition, the formation of M6C carbides, Y2O3, and SiO2 improved creep life. To summarize the effect of Y, Y addition promoted the formation of cracks, which brought about creep anisotropy; however, it improved creep properties through the stabilization of oxygen and the promotion of discrete carbide precipitation, which prohibited the migration and sliding of grain boundary.
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7

Kiessler, Gonde, and Gerhard Elssner. "Gemeinschaftsversuch an einer beschichteten Hastelloy-X-Probe / Group Trials on a Specimen of Coated Hastelloy-X." Practical Metallography 37, no. 3 (March 1, 2000): 123–39. http://dx.doi.org/10.1515/pm-2000-370303.

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8

Cho, Hyun, and Byeong-Woo Lee. "High temperature properties of surface-modified Hastelloy X alloy." Journal of the Korean Crystal Growth and Crystal Technology 22, no. 4 (August 31, 2012): 183–89. http://dx.doi.org/10.6111/jkcgct.2012.22.4.183.

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9

Xuewen, Zong, Zhang Jian, and Fu Hanguang. "Effect of laser inclination angle on mechanical properties of Hastelloy X processed by selective laser melting." Materials Testing 63, no. 1 (January 1, 2021): 10–16. http://dx.doi.org/10.1515/mt-2020-0001.

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Анотація:
Abstract Selective laser melting at various laser inclination angles was used to prepare Hastelloy X alloy specimens. The morphology, fracture, tensile strength, stress, and strain of Hastelloy X alloy specimens were studied using optical microscopy, scanning electron microscopy, and a tensile tester. The temperature field of the manufacturing process was analyzed based on finite element analysis, and the internal relationship between the temperature field and the process was constructed in terms of cooling speed. The results show that the temperature field is a dynamic process with a high cooling rate; the average cooling rate reaches 3.23 × 106 °C × s−1. The greater the inclination angle, the greater the thermal gradient, resulting in higher cooling rates. Due to the cross-influence of grain refinement at high cooling rates and residual stress, the tensile strength and yield strength of Hastelloy X alloy showed first increasing and then decreasing trends with respect to inclination angle. However, at an inclination angle of 30°, the voids and crack defects of Hastelloy X alloy fractures were reduced, and the tensile strength and yield strength reached 881.38 and 701.60 MPa, respectively. At this angle, the mechanical properties were excellent and met the requirements of the aviation industry.
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10

Sandhi, Ketan Kumar, and Jerzy Szpunar. "Analysis of Corrosion of Hastelloy-N, Alloy X750, SS316 and SS304 in Molten Salt High-Temperature Environment." Energies 14, no. 3 (January 21, 2021): 543. http://dx.doi.org/10.3390/en14030543.

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Анотація:
Nickel superalloy Hastelloy-N, alloy X-750, stainless steel 316 (SS316), and stainless steel 304 (SS304) are among the alloys used in the construction of molten salt reactor (MSR). These alloys were analyzed for their corrosion resistance behavior in molten fluoride salt, a coolant used in MSR reactors with 46.5% LiF+ 11.5% NaF+ 42% KF. The corrosion tests were run at 700 °C for 100 h under the Ar cover gas. After corrosion, significant weight loss was observed in the alloy X750. Weight loss registered in SS316 and SS304 was also high. However, Hastelloy-N gained weight after exposure to molten salt corrosion. This could be attributed to electrochemical plating of corrosion products from other alloys on Hastelloy-N surface. SEM–energy-dispersive X-ray spectroscopy (EDXS) scans of cross-section of alloys revealed maximum corrosion damage to the depth of 250 µm in X750, in contrast to only 20 µm on Hastelloy-N. XPS wide survey scans revealed the presence of Fe, Cr, and Ni elements on the surface of all corroded alloys. In addition, Cr clusters were formed at the triple junctions of grains, as confirmed by SEM–EBSD (Electron Back Scattered Diffraction) analysis. The order of corrosion resistance in FLiNaK environment was X750 < SS316 < SS304 < Hastelloy-N.
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Більше джерел

Дисертації з теми "Hastelloy X"

1

Nguyen, Vy Thuy. "Onset of Arizona Road Dust in High Temperature Environment on a Cooled HASTELLOY X Surface." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83519.

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Анотація:
In the past several decades there has been an increased interest in sand, dust, and ash particulates ingestion study for gas turbine engine applications. Recently, there has been an increase in commercial and military fleets operating in medium to highly dusty environments, such as areas in Africa, the Middle East, and Asia. Dusty environments can cause blockage in turbine cooling circuits which can lead to early engine maintenance or removals. Ingested debris can melt, forming glassy or molten deposits on various hot section components in gas turbine engines. This thesis evaluates the onset of deposit formation using an experimental rig to perform testing in high temperature environment. In general, deposits on turbine components can affect the operating capacity and the overall operating efficiency of gas turbine engines. Particulate ingestion events can be catastrophic and cost millions of dollars in maintenance and repairs. The experimental work in this thesis focused only on quantifying the initial deposit formation in high temperature environment to aid in the development of resilient engine design and operational diagnostics. Testing was performed using HASTELLOY® X coupons and Arizona Road Dust with main gas flow temperatures between 1050°C and 1100°C. Arizona Road Dust sample with sizing between 2µm and 40µm were used for experimental testing. The sensitivity of the initial deposit formation on cooled HASTELLOY® X coupon surface was investigated by using an inline air heater. Three cooling test conditions: no cooling, 500°C cooling, and 250°C cooling, were used to alter the surface temperature of the coupon during testing. Results from testing indicated cooling test conditions used have a small impact on deposit formation.
Master of Science
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2

Graneix, Jérémie. "Étude du soudage LASER Yb : YAG homogène et hétérogène des superalliages Hastelloy X et Haynes 188." Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0114/document.

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Анотація:
De nos jours, la complexité des pièces mécaniques est de plus en plus grande dans de nombreux secteurs industriels de pointes tels que l’aéronautique, l’aérospatiale ou bien encore le domaine médical. Pour répondre à ces nouvelles exigences, notamment en termes de géométrie, de nouvelles techniques de conception et de fabrication automatisées intègrant également une meilleure traçabilité des pièces, sont mises en place. Ce travail de thèse s’est inscrit dans un projet partenarial entre le Laboratoire Génie de Production de l’ENIT et la société EXAMECA, spécialiste de pièces chaudronnées pour l’aéronautique. L’étude a porté plus précisément sur l’assemblage permanent de pièces en superalliages par soudage LASER pour la réalisation d’une nouvelle chambre de combustion de turbomachine. Les assemblages des différentes parties de la chambre de combustion sont actuellement réalisés par procédé TIG (Tungsten Inert Gas), encore appelé procédé GTAW (Gas Tungsten Arc Welding), de manière manuelle ou semi-automatique avec fil d’apport de la même nuance que le superalliage base nickel. Même si cette technique industrielle est éprouvée, elle peut générer encore des problèmes de non-conformité car elle requière une grande dextérité des opérateurs pour éviter notamment les déformations importantes des pièces chaudronnées. L’étude avait donc pour objectif d’évaluer la pertinence du procédé de soudage LASER Yb : YAG pour l’assemblage homogène et hétérogène des superalliages Hastelloy X et Haynes 188 sans métal d’apport. Le procédé de soudage autogène à l’aide d’une source LASER disque Yb : YAG est encore relativement récent dans l’industrie même s’il semble offrir de nouvelles perspectives intéressantes. Une première partie de l’étude a permis de caractériser la caustique du faisceau LASER afin de déterminer des paramètres clés lors du soudage que sont par exemple la forme et la taille du spot LASER, la répartition de la densité de puissance à la surface de la pièce ou au point focal par exemple. Cette étape finalisée, les domaines de soudabilité des assemblages homogènes des superalliages Hastelloy X et Haynes 188 et des assemblages hétérogènes Hastelloy X - Haynes 188 ont été déterminés. L’influence des principaux paramètres de soudage sur la géométrie (forme et taille) et la tenue mécanique des cordons a pu être identifiée. Des conditions optimales de soudage ont été établies pour les différentes conditions de soudage. Une étude métallurgique des cordons optimisés, obtenus pour les différentes configurations, a été menée à différentes échelles. Elle a permis de déterminer des relations entre d’une part, les paramètres et les modes de soudage (conduction ou keyhole) et d’autre part, entre les modes de soudage et les microstructures des différentes zones des cordons qui conditionnement leurs propriétés mécaniques
Nowadays, the complexity of mechanical parts is becoming more and more important in numerous cutting-edge insdustries such as aeronautics, aerospace or the medical field. To meet such new requirements, particulary in terms of geometry, innovative conception and automated manufacturing techniques, integrating as well a better traceability of parts, are implemented. This thesis is in partnership with The LGP (Laboratoire Génie de Production) of the National Engineering School of Tarbes (ENIT) and EXAMECA, a company specialized in boiler making for aerospace applications. The study essentially focused on permanent assembly of superalloy parts by LASER welding, in order to develop a new turbomachinery combustion chamber. Assembly of different parts of the combustion chamber are presently performed by TIG (Tungsten Inert Gas) process, or GTAW (USA : Gas Tungsten Arc Welding) process. This manufacturing phase is realized in a manual mode with semi-automatic equipment providing the wire with a similar grade as the nickel base superalloy. Even though this industrial process has been proven, it can still cause noncompliance issues because it requires great dexterity from operators to avoid important deformations of welded parts. Therefore, this study aimed at evaluating the relevance of LASER Yb : YAG welding process, for homogeneous and heterogeneous assembly of Hastelloy X and Haynes 188 superalloys, without filler metal. Autogeneous welding process associated with LASER Yb : YAG disc source is still relatively new in the industry even though it seems to offer very promising perspectives. A first part of the study is dedicated to LASER beam’s caustic characterization, in order to determine key parameters for welding, including shape and size of LASER spot, power density distribution on the surface or at focal point. Once this phase was completed, fields of weldability of homogeneous assemblies of Hastelloy X and Haynes 188 superalloys as well as heterogeneous assemblies of Hastelloy X / Haynes 188 have been determined. Impact of main welding parameters on geometry (shape and size) and mechanical strength beads were identifed. Optimal welding conditions have been established for different welding conditions. A metallurgical study on optimized beads, obtained for different configurations, has been carried out at different scales. It allowed determining relationships between parameters and welding modes (conduction or keyhole), but also between welding modes and microstructures of different beads areas that condition mechanical properties
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3

Hutchinson, John Patrick. "Experimental Investigations of the Onset of Sand Deposits on Hastelloy-X between 1000 C and 1100 C." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/83233.

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Анотація:
In many arid regions, particle ingestion can occur within propulsive gas turbines. The ingested particles can severely impact performance and may damage many primary gas path components through erosion or deposition. Characterizing crystalline deposits on metallic substrates can allow for the prediction of deposition to improve component resilience and develop health monitoring algorithms. This work investigates the effect of temperature and angle on sand deposits and attempts to quantitatively characterize the deposition of Arizona Test Dust (ATD) onto Hastelloy X. The first study presented in this thesis describes a preliminary investigation of sand deposition at temperatures and velocities similar to those found in the turbine section of propulsive gas turbine engines and presents an equation for predicting deposition as a function of gas path temperature and impact angle. The sand and air mixture maintained a constant flow velocity of approximately 70 m/s, impact angle was varied from 30° to 90°, and the gas path temperature was varied from 1000 °C to 1100 °C. The number of deposits was found to linearly increase with temperature for all coupon angles tested. The model was able to explain approximately 67% of the deposition that occurs, with the remaining percentage due to other factors such as injection rates and surface temperature. The second study describes an improved investigation of sand deposition and presents an equation for predicting deposition as a function of surface temperature and impact angle. This study characterizes deposition using percent coverage in addition to deposits per square millimeter. Deposition is a quadratic function of both near surface coupon temperature and coupon angle. The model using deposits per mm2 was able to explain 96.3% of the deposition that occurred and the model using percent coverage was able to explain 98.9% of the deposition that occurred.
Master of Science
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4

Saarimäki, Jonas. "The mechanical properties of lattice truss tructures with loadbearing shells made of selectively laser melted Hastelloy X (TM)." Thesis, KTH, Industriell produktion, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41320.

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Анотація:
This thesis discusses how to test the mechanical properties of openlattice truss structures and hybrids being a tube containing a latticetruss structure. By properties we mean strength, stiffness, thermalconductivity and so forth.Mechanical testing was done on two different structures to betterunderstand how the load-bearing properties change when these structuresare subjected to tensile, compressive and bending forces. The structuresinvestigated were Diamond and Octagon built at 45° and 90°. Acousticemission was also used to evaluate and analyze the different behaviour ofthe structures. The test results were used to produce design criteria forproperties in different cell structures manufactured of Hastelloy X™. Amap with design criteria containing stiffness and weight per cubiccentimetre was produced for parts that would be subjected to compressiveforces.
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5

Oliveira, Célio Roberto de Lima. "Utilização dos ensaios de ultrassom e correntes parasitas no acompanhamento da oxidação em revestimentos TBC com NiCrAl e YSZ sobre liga de Inconel 718 e Hastelloy X." Universidade Tecnológica Federal do Paraná, 2016. http://repositorio.utfpr.edu.br/jspui/handle/1/1977.

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Анотація:
Este trabalho apresenta a utilização de métodos não destrutivos (ultrassom e correntes parasitas) no acompanhamento da vida útil de revestimentos de barreiras térmica (TBC). As amostras estudadas possuíam como metal de base as superligas de Inconel 718 e Hastelloy X, um revestimento de NiCrAl usado como metal de ligação e um revestimento superior de cerâmica YSZ usado com a finalidade de isolamento térmico. Estas amostras foram submetidas a ciclos térmicos simulando as condições térmicas de trabalho de componentes de turbinas a gás. Com o ensaio de ultrassom foi feita a caracterização da camada cerâmica, fazendo uma estimativa de sua porosidade através da velocidade de propagação do som no revestimento, conforme ciclagem térmica. O ensaio com correntes parasitas foi utilizado para caracterização elétrica dos materiais com revestimento, acompanhando as mudanças de condutividade elétrica através do monitoramento do ângulo de fase segundo seu ciclo de vida útil. Também com este método foram feitas medidas de espessuras dos revestimentos, acompanhando do crescimento da camada de óxido crescida termicamente e a sinterização da camada cerâmica. Para validação dos resultados obtidos pelos métodos não destrutivos adotados, estes resultados foram comparados com resultados de análises por micrografia das amostras utilizadas. Para avaliação da pré-oxidação nos revestimentos as amostras foram separadas em dois grupos, com metal de base Inconel 718 e com metal de base Hastelloy X. O grupo de amostras com Inconel 718 quando submetido ao ensaio de oxidação apresentou a formação de uma camada de alumina, isto até 30 ciclos do ensaio, com o decorrer dos ciclos foram formados óxidos de níquel e cromo que tiveram um rápido crescimento levando o revestimento ao desplacamento. As amostras com substrato Hastelloy X no ensaio de oxidação apresentaram predominantemente a alumina, formando até mais de uma camada deste mesmo óxido, não apresentou óxidos de níquel e cromo, sendo que nenhuma amostra ensaiada apresentou desplacamento de camada TBC. A utilização dos ensaios não destrutivos se mostrou eficiente para acompanhar o ciclo de vida dos revestimentos TBC, onde o acompanhamento das variações de espessuras mostrou pouca diferença de valor com relação a medições com método metalográfico. A leitura de condutividade elétrica através do ângulo de fases foi um bom indicativo da formação de óxidos prejudiciais, que foram os óxidos de níquel e cromo, os quais foram evidenciados por ensaios em MEV/EDS. Foi observado que a velocidade do ultrassom tem uma relação inversamente proporcional à porosidade da camada cerâmica, esta analisada com método metalográfico.
This paper presents an evaluation of the use of non-destructive methods with ultrasound and eddy currents, monitoring of life and characterization of thermal barrier coatings (TBC). This coatings are used to protect base metal components that operate at high temperatures. With the method that uses the ultrasonic characterization of ceramic layer was made an estimating their porosity through the sound propagation of velocity in the coating. The test with eddy currents was used here to make an electrical characterization of materials coated, following the changes of electrical conductivity through the phase angle monitoring following their lifecycle. Also with this method are made the measurements of coatings thickness, following the growth of the thermally grown oxide layer and sintering of the ceramic layer. To validate the results obtained by non-destructive methods, these results were compared with results from analyzes micrograph of the samples used. For evaluation of pre-oxidation in the sample coatings were separated into two groups based metal Inconel 718 and Hastelloy X base metal. The group of samples with Inconel 718 when subjected to the oxidation test showed the formation of an alumina layer up to 30 cycles of the testwith the passing of the cycles were formed oxides of nickel and chromium which grew quickly leading the coating to the cracks. The samples of Hastelloy X in substrate oxidation test showed predominantly alumina to form up more than one layer of the same oxide no showed oxides of nickel and chromium, and no cracks in the test sample are showed in TBC layer. The use of non destructive testing has shown effective to follow the life cycle of TBC coatings. Where the monitoring of variations in thickness, showed little difference in value with respect to measurements metallographic method. The reading of electrical conductivity through the phase angle is a good indicator of formation of harmful oxides which were nickel and chromium oxides, which was evidenced by tests on MEV/EDS. It was observed that the ultrasound velocity has an inversely proportional relation to the porosity of the ceramic layer, that analyzed using metallographic method.
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6

MARCHESE, GIULIO. "Study and characterisation of Ni-based superalloys produced by laser additive manufacturing." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2694925.

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Анотація:
The laser additive manufacturing techniques (LAM) are of growing interest in different industries due to their capacity to produce near net shape components in a single step. Particularly in the case of the Ni-based superalloys, LAM processes can produce highly complex shape components more cheaply with respect to the traditional technologies. However, nowadays, there is still a lack of knowledge on the study of the process parameters on the microstructure and densification levels and the study of tailored heat treatments to meet standard qualification as well as precise industrial requirements. This thesis presents the research performed on two Ni-based superalloys produced by LAM processes. Inconel 625 (IN625) fabricated by laser powder bed fusion (LPBF) and directed energy deposition (DED) and Hastelloy X (HX) built by LPBF. For LPBF IN625 alloy was studied the effect of different process parameters on the hardness and densification level, obtaining dense samples (relative density over 99.8 %). Afterward, it was studied in detail the microstructure, mechanical and thermomechanical properties of as-built IN625. The results showed that the tensile behaviours of as-built IN625 state are higher than minimum values requirements for wrought IN625 alloys, due to very fine dendritic structures (mainly less than 1.5 micron) coupled with high dislocation density. However, the characterisation of as-built IN625 samples revealed that heat treatments are necessary to decrease the residual stresses, reduce elements segregation, and produce mechanical properties suitable for industrial applications. For this reason, the microstructural evolution of LPBF IN625 under different heat treatments was investigated. According to the performed heat treatment, the mechanical properties of heat-treated IN625 were influenced by phases precipitation (mainly γʺ phases and carbides) and/or recrystallisation, grain growth and dissolution of dendritic structures. For DED IN625 alloy, the aim of this work was to determine the impact of different process parameters on the densification level (relative density over 99.7 %), hardness and microstructure in order to select the appropriate parameters for industrial production. Finally, LPBF HX alloy was studied in a research collaboration with GE AVIO s.r.l. The target of this work was to investigate the microstructure of as-built and post-processed LPBF HX alloy. The as-built HX samples showed different microcracks caused by the LPBF process, so some samples were hot isostatically pressed (HIPed) to close the microcracks. The microstructure, grain size, phases and hardness of the as-built, heat-treated and HIPed HX samples were investigated. The results revealed that in case microcracks appear during production, they can be removed after specific post processing, generating LPBF HX parts with grain size similar to standard solution heat-treated (SHT) wrought HX alloy.
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7

Liu, Hsu-Cheng, and 劉許成. "Constitutive Analysis of Superalloy Hastelloy-X under Hot compression." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/71653876915129796180.

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Анотація:
碩士
中華大學
機械工程學系碩士班
102
Abstract Hot deformation characteristics of Hastelloy X Ni-base superalloy were investigated at elevated temperatures. Hot compressive tests were carried out in the temperature and strain rate ranges from 900 to 1150 °C and 0.001 to 1 s–1, respectively. The constitutive equation relating flow stress, temperature, and strain rate was obtained based on the peak stresses. The flow behavior showed that the softening mechanisms were related to the dynamic recovery (DRV) and dynamic recrystallization (DRX). The flow stress of Hastelloy X was fitted well by the constitutive equation of the hyperbolic sine function. The constitutive analysis suggested that the hot deformation mechanism of the Hastelloy X was dislocation creep. The flow stress of Hastelloy X was fitted well by the constitutive equation of the hyperbolic sine function. The constitutive analysis suggested that the hot deformation mechanism of the Hastelloy X was dislocation creep.Q value437KJ/mol，stress exponent (n)5.4。 Keywords: Hastelloy X superalloy, Flow behavior, Dynamic softening, Constitutive analysis. Dynamic recrystallization ,DRX、Dynamic recovery，DRV。
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Du, Chao-Wei, and 杜昭緯. "Comparisons of Mechanical Properties of GTAW and LASER Welded Hastelloy X Superalloy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/12430820850968696582.

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Анотація:
碩士
義守大學
機械與自動化工程學系碩士班
96
This research deals the problems that cracks induced by metal fatigue and structural aging effect, which can’t be repaired by traditional Gas Tungsten Arc Welding (GTAW) and cause the increasing of defect rate. Although some cracks might still be accepted and qualified to field service according to military regulation, nevertheless, some problems, for example brazing and coating area, can’t be overcome by traditional welding technology. In order to lower the defect rate, seeking new processes and decreasing the component defects to keep the cost down are needed. In this study, Hastelloy X superalloy was chosen as the test material, which was performed mechanical tests by adopting Nd-YAG Laser and traditional GTAW processes. Moreover, by the use of OM and SEM, macro- and microstructure were observed that were compared with hardness testing. On the other hand, residual stress after welding was measured by X-ray diffraction. As the research results, traditional welding technology shows better ultimate tensile strength and ductility. For Nd:YAG laser welding, residual stress only exists in the both side of weld (3mm) and drops very quickly; however, higher amplitude and widely spread in the GTAW welding. If combine both technology, the repairing process could be optimized and keep the welding quality in high level in order to lower the defective rate and save time for repairing.
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9

Graneix, Jérémie. "Étude du soudage LASER Yb : YAG homogène et hétérogène des superalliages Hastelloy X et Haynes 188." Phd thesis, 2015. http://oatao.univ-toulouse.fr/15523/1/Graneix_1.pdf.

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De nos jours, la complexité des pièces mécaniques est de plus en plus grande dans de nombreux secteurs industriels de pointes tels que l’aéronautique, l’aérospatiale ou bien encore le domaine médical. Pour répondre à ces nouvelles exigences, notamment en termes de géométrie, de nouvelles techniques de conception et de fabrication automatisées intègrant également une meilleure traçabilité des pièces, sont mises en place. Ce travail de thèse s’est inscrit dans un projet partenarial entre le Laboratoire Génie de Production de l’ENIT et la société EXAMECA, spécialiste de pièces chaudronnées pour l’aéronautique. L’étude a porté plus précisément sur l’assemblage permanent de pièces en superalliages par soudage LASER pour la réalisation d’une nouvelle chambre de combustion de turbomachine. Les assemblages des différentes parties de la chambre de combustion sont actuellement réalisés par procédé TIG (Tungsten Inert Gas), encore appelé procédé GTAW (Gas Tungsten Arc Welding), de manière manuelle ou semi-automatique avec fil d’apport de la même nuance que le superalliage base nickel. Même si cette technique industrielle est éprouvée, elle peut générer encore des problèmes de non-conformité car elle requière une grande dextérité des opérateurs pour éviter notamment les déformations importantes des pièces chaudronnées. L’étude avait donc pour objectif d’évaluer la pertinence du procédé de soudage LASER Yb : YAG pour l’assemblage homogène et hétérogène des superalliages Hastelloy X et Haynes 188 sans métal d’apport. Le procédé de soudage autogène à l’aide d’une source LASER disque Yb : YAG est encore relativement récent dans l’industrie même s’il semble offrir de nouvelles perspectives intéressantes. Une première partie de l’étude a permis de caractériser la caustique du faisceau LASER afin de déterminer des paramètres clés lors du soudage que sont par exemple la forme et la taille du spot LASER, la répartition de la densité de puissance à la surface de la pièce ou au point focal par exemple. Cette étape finalisée, les domaines de soudabilité des assemblages homogènes des superalliages Hastelloy X et Haynes 188 et des assemblages hétérogènes Hastelloy X - Haynes 188 ont été déterminés. L’influence des principaux paramètres de soudage sur la géométrie (forme et taille) et la tenue mécanique des cordons a pu être identifiée. Des conditions optimales de soudage ont été établies pour les différentes conditions de soudage. Une étude métallurgique des cordons optimisés, obtenus pour les différentes configurations, a été menée à différentes échelles. Elle a permis de déterminer des relations entre d’une part, les paramètres et les modes de soudage (conduction ou keyhole) et d’autre part, entre les modes de soudage et les microstructures des différentes zones des cordons qui conditionnement leurs propriétés mécaniques.
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10

Jang, Hung-Chi, and 簡桓祺. "Effect of Laser Surface Treatment on the Properties of High- temperature Oxidation Resistance of Hastelloy-X." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/83008456156665899277.

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Книги з теми "Hastelloy X"

1

Castelli, Michael G. Thermomechanical deformation behavior of a dynamic strain aging alloy, Hastelloy X. [Washington, DC]: National Aeronautics and Space Administration, 1992.

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2

Laszlo, Berke, Murthy P. L. N, and United States. National Aeronautics and Space Administration., eds. Material data representation of hysteresis loops for Hastelloy X using artificial neural networks. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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3

Laszlo, Berke, Murthy P. L. N, and United States. National Aeronautics and Space Administration., eds. Material data representation of hysteresis loops for Hastelloy X using artificial neural networks. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Частини книг з теми "Hastelloy X"

1

Mohd Nor, Nor Aznan, B. T. Hang Tuah Baharudin, Zulkiflle Leman, and Mohd Khairol Anuar Mohd Ariffin. "Cutting Force in Dry Slot-Milling of Hastelloy X." In Lecture Notes in Mechanical Engineering, 1–7. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2890-1_1.

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2

Casperson, Mallory, Jay Carroll, Wael Abuzaid, John Lambros, Huseyin Sehitoglu, Mike Spottswood, and Ravinder Chona. "Studying Thermomechanical Fatigue of Hastelloy X using Digital Image Correlation." In Experimental and Applied Mechanics, Volume 6, 575–78. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9792-0_84.

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3

Lu, Y. L., L. J. Chen, P. K. Liaw, G. Y. Wang, M. L. Benson, S. A. Thompson, J. W. Blust, et al. "Elevated-Temperature Crack-Growth Behavior of Nickel-Base Hastelloy® X Alloy." In Materials Lifetime Science & Engineering, 33–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118788035.ch4.

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4

Kim, Woo Gon, Sang Nan Yin, Woo Seog Ryu, and Jong Hwa Chang. "Creep Properties of Hastelloy-X Alloy for the High Temperature Gas-Cooled Reactor." In Experimental Mechanics in Nano and Biotechnology, 1105–8. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1105.

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5

Deshmukh, Poonam, Ambar Choubey, A. N. Jinoop, C. P. Paul, S. S. Mohite, and K. S. Bindra. "Laser Polishing of Laser Additive Manufactured Hastelloy-X: Parametric Dependence and Process Optimization." In Advances in Materials and Mechanical Engineering, 339–46. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0673-1_27.

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6

Kim, Woo Gon, Song Nan Yin, Woo Seog Ryu, Yong Wan Kim, and Won Yi. "Creep Curve Modeling of Hastelloy-X Alloy by Using the Nonlinear Regression Method in the Kachanov-Rabotnov Creep Model." In The Mechanical Behavior of Materials X, 589–92. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-440-5.589.

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7

Bilgin, Guney Mert, Cansinem Tuzemen, Cemre Tigli, and Yesim Nur Gulcan. "Investigation of Microstructure and Mechanical Properties of SLM-Produced Inconel 718 and Hastelloy-X Alloys." In Structural Integrity of Additive Manufactured Materials & Parts, 340–51. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2020. http://dx.doi.org/10.1520/stp163120190133.

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8

Rajesh, C. Anil, P. Naik Parrikar, S. Abotula, and A. Shukla. "Effect of Boundary Conditions on the Thermo-Mechanical Response of Hastelloy® X Plates Subjected to Shock Loading." In Dynamic Behavior of Materials, Volume 1, 301–5. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06995-1_43.

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9

Diljith, P. K., A. N. Jinoop, C. P. Paul, P. Krishna, S. Bontha, and K. S. Bindra. "Elucidating Corrosion Behavior of Hastelloy-X Built Using Laser Directed Energy Deposition-Based Additive Manufacturing in Acidic Environments." In Advances in Materials and Mechanical Engineering, 347–55. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0673-1_28.

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10

Mills, Kenneth C. "Ni - Hastelloy-X." In Recommended Values of Thermophysical Properties for Selected Commercial Alloys, 175–80. Elsevier, 2002. http://dx.doi.org/10.1533/9781845690144.175.

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Тези доповідей конференцій з теми "Hastelloy X"

1

"3D Residual Stresses in Selective Laser Melted Hastelloy X." In Residual Stresses 10. Materials Research Forum LLC, 2016. http://dx.doi.org/10.21741/9781945291173-13.

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2

Beamer, Chad, Derek Denlinger, Suraj Rao, and Christina Dinh. "High Pressure Heat Treatment for L-PBF Hastelloy X." In HT2021. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.ht2021p0044.

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Abstract Hastelloy X is used in turbomachinery and petrochemical applications as it is designed for excellent oxidation and stress corrosion cracking resistance, strength, and stress rupture behavior. This alloy is now being printed via powder bed fusion processes as many industries have developed interests in the benefits additive manufacturing (AM) offers. However asprinted Hastelloy X suffers from material defect formation such as hot cracking. Hot isostatic pressing (HIP) is often applied to improve performance and reliability. Although the conventional HIP process has been shown to eliminate defects, the equipment is unable to cool at desired rates allowing the formation of excessive carbide precipitation, negatively influencing corrosion resistance and toughness. In turn the product is solution treated at a similar temperature while applying rapid gas cooling for performance requirements. With use of Uniform Rapid Cooling® available in modern HIP equipment, a high-pressure heat treatment can be applied offering the ability to perform both HIP and heat treatment in one piece of equipment. Microstructure and tensile properties are evaluated and compared to the conventional processing routes. The results demonstrate that the novel high pressure heat treatment approach offers a processing route that is equivalent to or better than conventional methods.
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3

Varela J., Luis A., Calvin M. Stewart, and Ali P. Gordon. "Modeling the Creep of Hastelloy X Using the Miller and Walker Unified Viscoplastic Constitutive Models." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45108.

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Hastelloy X is widely used in the pressure vessel and piping (PVP) industries, specifically in nuclear and chemical reactors, pipes and valves applications. Hastelloy X is favored for its resistance to extreme environments, although it exhibits a rate-dependent mechanical behavior. Numerous unified viscoplastic models proposed in literature claim to have the ability to describe the inelastic behavior of superalloys subjected to a variety of boundary conditions; typically limited experimental data is used to validate their performance. In this paper, two unified viscoplastic models (Miller and Walker) were experimentally validated for Hastelloy X creep behavior. Both constitutive models are coded into ANSYS Mechanical as user programmable features (UPF). Creep behavior is simulated at a broad range of stress levels. The results are compared to an exhaustive database of experimental data to fully validate the capabilities and performance of these models. Material constants are calculated using the recently developed Material Constant Heuristic Optimizer (MACHO) software. This software uses the simulated annealing algorithm to determine the optimal material constants by using an extensive database of experimental data. A qualitative and quantitative discussion is presented to determine the most suitable model for Hastelloy X PVP components.
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4

Sadek, A., and H. Song. "Optimization of Heat Treatment Parameters for Additive Manufacturing Hastelloy X." In MS&T19. TMS, 2019. http://dx.doi.org/10.7449/2019mst/2019/mst_2019_13_21.

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5

Sadek, A., and H. Song. "Optimization of Heat Treatment Parameters for Additive Manufacturing Hastelloy X." In MS&T19. TMS, 2019. http://dx.doi.org/10.7449/2019/mst_2019_13_21.

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6

Musalek, Radek, Jan Medricky, Zdenek Pala, Ondrej Kovarik, Libor Tomek, Nicholas Curry, and Stefan Bjorklund. "Fatigue Performance of TBCs on Hastelloy X Substrate during Cyclic Bending." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0406.

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Abstract Our previous experiments with low-cost steel substrates confirmed that individual steps of conventional thermal barrier coating (TBC) deposition may influence fatigue properties of the coated samples differently. In this study, testing was carried out for TBC samples deposited on industrially more relevant Hastelloy X substrates. Samples were tested after each step of TBC deposition process: as-received (non-coated), grit-blasted, bond-coated (NiCoCrAlY) and bondcoated + top-coated (yttria-stabilized zirconia - YSZ). Conventional atmospheric plasma spraying (APS) with gas stabilized plasma torch was used for deposition of both bond coat and top coat. In addition, for one half of the samples, bond coat was prepared by consecutive combination of HVAF (High Velocity Air Fuel) and APS processes. Samples were tested both in as-sprayed condition and after 100 hours annealing at 980 °C, which simulated in-service conditions. Obtained results showed that different fatigue performance may be expected for various stages of the TBC deposition as well as due to the variation of the deposition process and sample temperature history.
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7

Coskun, M. Bulut, Serdar Aksoy, Necdet Basaran, and Mahmut F. Aksit. "Friction and Wear Characteristics of H25, H188, H214 Against Hastelloy X." In ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61110.

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Increasing, demand for more efficient power generation forces turbomachinery to operate at higher temperatures and compression ratios. High speeds combined with high temperatures make turbomachinery sealing applications even more challenging. In order to confirm sufficient service life, seal material pairs should be tested similar to engine operating conditions. The high temperature friction and wear characteristics of cobalt superalloys, Haynes 25, 188 and 214 sheets, rubbed against Hastelloy X pins are presented in this work. Tests are conducted at 25, 200 and 400°C with a validated custom design linear reciprocating tribometer. Sliding speed and distance are 1Hz and 1.2 Km respectively. Friction coefficients are calculated with friction force data acquired from load cell and the dead weight where wear coefficient is calculated through mass loss after the tests.
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8

Bright, Robin, Paul Jacobs, Mark Aindow, and Harris Marcus. "The influence of pulse parameters on the laser drilling of hastelloy X." In ICALEO® 2007: 26th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2007. http://dx.doi.org/10.2351/1.5060995.

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9

Chen, Lijia, Peter K. Liaw, Robert L. McDaniels, James W. Blust, Paul F. Browning, Rodger R. Seeley, and Dwain L. Klarstrom. "Low-Cycle Fatigue of Nickel-Based Superalloy Hastelloy X at Elevated Temperatures." In ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0422.

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The fully-reversed total strain-controlled low-cycle fatigue tests with and without hold times, as well as stress-relaxation tests, were conducted at 816°C and 927°C in laboratory air on a nickel-based superalloy, HASTELLOY X. The influence of temperatures and hold times on low-cycle fatigue behavior of the alloy was investigated. At both temperatures of 816°C and 927°C, the alloy exhibited initial cyclic hardening, followed by a saturated cyclic stress response or cyclic softening under low-cycle fatigue without hold times. For low-cycle fatigue tests with hold times, however, the alloy showed either cyclic hardening or cyclic stability, which is closely related to the test temperature and the duration of the hold time. It was also observed that the low-cycle fatigue life of the alloy considerably decreased due to the introduction of strain hold times. Generally, a longer hold time would result in a greater reduction in the fatigue life. However, for the tests without hold times, the test temperature seems to have little influence on the fatigue life of the alloy at the test temperatures used in this investigation. The stress relaxation tests show that at the beginning of strain hold, the stress drops very quickly and then decreases very slowly with prolonging time. In addition, the fracture surfaces of the fatigued specimens were observed using scanning electron microscopy to determine the crack initiation and propagation modes. The fatigue life was predicted by the frequency modified tensile hysteresis energy method. The predicted lives were found to be in good agreement with the experiment results.
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10

Caiazzo, Fabrizia, Gaetano Corrado, Vittorio Alfieri, Vincenzo Sergi, and Luigi Cuccaro. "Disk-laser welding of Hastelloy X cover on René 80 turbine stator blade." In XIX International Symposium on High-Power Laser Systems and Applications, edited by Kerim R. Allakhverdiev. SPIE, 2013. http://dx.doi.org/10.1117/12.2010572.

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