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Thermal-Stress Coupling Effect on Microstructure Evolution of a Fourth-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C
Xu Jinghui1; Li Longfei1; Liu Xingang2; Li Hui2; Feng Qiang1
Corresponding AuthorLi Longfei(lilf@skl.ustb.edu.cn)
2021-02-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume57Issue:2Pages:205-214
AbstractThe mechanism of microstructure evolution and its effect on the mechanical properties of nickel-based single-crystal superalloys during creep at high temperatures and low stresses are critical to the development of advanced single-crystal superalloys for aeroengines with high thrust: weight ratios. In this work, the microstructural evolution of a fourth-generation nickel-based single-crystal superalloy during creep at 1100 degrees C for 200 h at various stress levels was investigated using a specially designed sample with variable cross-sections, with the aim of obtaining different applied stresses synchronously on a single sample. The effects of applied stress on gamma/gamma' microstructure, interfacial dislocation configuration, alloy element partitioning behavior, and lattice misfit of gamma/gamma' phases of the used single-crystal superalloy were also studied, as were the effects on room temperature Vickers hardness. The results indicated that the typical rafting microstructure was formed during creep over the 200 h period at 1100 degrees C under various stress levels. With increasing applied stress, the volume fraction and rafted thickness of the gamma' phase gradually decreased, while the rafting degree of the gamma' phase and the channel width of the gamma phase gradually increased. A dense interfacial dislocation network was formed at the gamma/gamma' interface, and interfacial dislocation spacing decreased with increasing applied stress. Simultaneously, increased partitioning of solution-strengthening elements Re, Mo, and Cr to the gamma phase and increased partitioning of gamma'-strengthening element Ta to the gamma' phase resulted in a larger absolute value of gamma/gamma' lattice misfit at higher stress. In addition to the decreases in volume fraction and rafted thickness of the gamma' phase and the increase in channel width of the gamma phase, another important factor in the strength decline of the single-crystal superalloy was the pile-up of dislocations at bent gamma/gamma' interface boundaries, mainly caused by the dissolution of the gamma' phase and promotion of dislocation shear into the gamma' phase. This work provides a basis for quickly establishing the relationship between creep conditions and microstructure evolution of nickel-based single-crystal superalloys.
Keywordforth-generation nickel-based single-crystal superalloy high temperature and low stress variable cross-section creep microstructure evolution gamma ' phase
Funding OrganizationNational Key Research and Development Program of China ; National Science and Technology Major Project
DOI10.11900/0412.1961.2020.00216
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFB0701403] ; National Science and Technology Major Project
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000613192500006
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160912
Collection中国科学院金属研究所
Corresponding AuthorLi Longfei
Affiliation1.Univ Sci & Technol Beijing, Beijing Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Xu Jinghui,Li Longfei,Liu Xingang,et al. Thermal-Stress Coupling Effect on Microstructure Evolution of a Fourth-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C[J]. ACTA METALLURGICA SINICA,2021,57(2):205-214.
APA Xu Jinghui,Li Longfei,Liu Xingang,Li Hui,&Feng Qiang.(2021).Thermal-Stress Coupling Effect on Microstructure Evolution of a Fourth-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C.ACTA METALLURGICA SINICA,57(2),205-214.
MLA Xu Jinghui,et al."Thermal-Stress Coupling Effect on Microstructure Evolution of a Fourth-Generation Nickel-Based Single-Crystal Superalloy at 1100 degrees C".ACTA METALLURGICA SINICA 57.2(2021):205-214.
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