Creep properties of single crystal Ni-base superalloys (SX): A comparison between conventionally cast and additive manufactured CMSX-4 materials

Bürger, David; Parsa, Alireza B.; Ramsperger, Markus; Körner, Carolin; Eggeler, Gunther

doi:10.1016/j.msea.2019.138098

Cited by 46 publications

(31 citation statements)

References 22 publications

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“…The scheme of the primary dendrite arm arrangement, for example in the fragment ET with the thickness D and height L* (Figure 3b,c), may be used to calculate the number of dendrite deflections. It can be correctly assumed that a dendrite grows directly toward the direction [001], as is commonly believed to occur [38].…”

Section: Resultsmentioning

confidence: 99%

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

2020

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In the present study, the dendrites deflection mechanism from the mold walls were subjected to verification regarding its heat-treated turbine rotor blades. The number of macroscopic low-angle boundaries created on the cross-section of the blades’ airfoil near the tip was experimentally determined and compared to the number of low-angle boundaries calculated from a model based on the dendrites deflection mechanism. Based on the Laue patterns and geometrical parameters of airfoils, the number of low-angle boundaries occurring at the upper part of the blades airfoil after heat treatment was calculated. This number for the analyzed group of blades ranged from 5 to 9.

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Section: Resultsmentioning

confidence: 99%

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

2020

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“…У литых и монокристаллических жаропрочных никелевых сплавов первая стадия ползучести, как правило, сопровождается значительным снижением скорости ползучести [12,15]. Для состояний сплава 1-3, полученных с помощью ДТО, этого почти не наблюдалось, что, по-видимому, связано с относительно легким зарождением и движением дислокаций в области межзеренных и межфазных границ благодаря относительно малому размеру γ-зерен.…”

Section: длительная прочность и сопротивление ползучести сплаваunclassified

Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

et al. 2021

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The work was devoted to the study of the long-term strength and creep resistance of the recently developed heat resistant nickel-based superalloy SDZhS-15 intended for manufacturing of discs for gas turbine engines. The as-cast alloy was subjected to homogenization heat treatment, hot forging at subsolvus temperatures with intermediate annealing, solution treatment at various temperatures and aging or only to aging. A predominantly fine-grained structure was obtained in the workpieces after forging. It was revealed that solution treatment at T > T s − 50, where T s is the solvus temperature of the γ'-phase, led to a decrease in the volume fraction of the primary γ'-phase and an increase in the volume fraction of the γ' precipitates together with a significant growth of γ grains (up to d > 50 μm). Solution treatment at Т = T s − 50 allowed maintaining a relatively finegrained structure (d γ =10 -20 μm) and ensured the precipitation of the secondary γ'-phase with a size of about 0.1 μm upon cooling in air. Three microstructure conditions were obtained, for which long-term strength and creep resistance tests were performed in the range of temperatures 650 -850°C and stresses 400 -1200 MPa. The highest values of the long-term strength were achieved for a relatively fine-grained condition obtained after solution treatment at T s − 50 and aging. To evaluate the service life of the superalloy, the methodology based on the calculation of the Larson-Miller parameter was used. It was shown that the long-term strength (creep resistance) of the SDZhS-15 alloy in the optimal condition was higher as compared to the industrial disc nickel-based superalloys EP741NP and Udimet 720. Microstructure examination of the creep tested samples did not result in significant microstructure changes and especially in the formation of topologically close-packed phases. After creep tests, microcracks were observed along the grain / interphase boundaries, which apparently resulted from the development of boundary diffusion and sliding.

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“…Although there are many potential benefits to this manufacturing process, many questions still exist regarding its use for high temperature applications. Most recent research has focused on the room temperature and high temperature time independent mechanical properties, with limited research on time-dependent properties [5][6][7]. The focus of this study was to evaluate the microstructural and high temperature time dependent mechanical properties of an additively manufactured nickel base super alloy.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical Evaluation of an Additively Manufactured Nickel-Base Superalloy for Gas Turbine Guide Vanes

Bridges

Shingledecker

Torkaman³

et al. 2020

Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small

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In this paper, AM produced test samples of a IN939 derivative nickel-based alloy were tested for tensile, fatigue and creep properties at temperatures up to 871°C and compared to the traditional cast material. Initial results showed improved tensile and fatigue strength, but a reduction in both long-term creep rupture strength and creep ductility in the AM produced material compared to the cast baseline. Microstructural observations in the AM produced material showed a significant difference in the overall metallurgical characteristics beyond grain size compared to the castings. In addition to the laboratory studies and to provide a direct comparison between AM and traditional castings, both AM and cast components were tested in live engine trials exceeding 4,000 hours. Detailed scanning electron microscopy techniques were used to evaluate the evolution of grain size, gamma-prime, MC carbide and secondary M23C6 carbide size and distribution throughout a 5-step heat treatment process. Post-test evaluations for creep rupture specimens of the AM material showed creep cavitation near grain boundaries. The results from the AM produced material are discussed in comparison to expected properties and characteristics from traditional casting methods. Results have shown that material production and short-term metallurgical properties are sufficient to produce quality high temperature stationary guide vanes, but additional research and development is needed to optimize the AM process to achieve high-temperature creep behavior comparable to castings.

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Creep properties of single crystal Ni-base superalloys (SX): A comparison between conventionally cast and additive manufactured CMSX-4 materials

Cited by 46 publications

References 22 publications

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

The Number of Subgrain Boundaries in the Airfoils of Heat-Treated Single-Crystalline Turbine Blades

Long-term strength and creep resistance of a polycrystalline Re-containing nickel-based superalloy

Metallurgical Evaluation of an Additively Manufactured Nickel-Base Superalloy for Gas Turbine Guide Vanes

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