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Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4
Wang Huan1,2; Ning Likui1; Tong Jian1; Tan Zheng1; Liu Enze1; Zheng Zhi1
Corresponding AuthorNing Likui(lkning@imr.ac.cn)
2020
Source PublicationRARE METAL MATERIALS AND ENGINEERING
ISSN1002-185X
Volume49Issue:1Pages:247-256
AbstractNickel base single crystal superalloys are widely used to fabricate turbine blade materials, since they have high temperature capability, excellent mechanical and environmental properties. Appropriate heat treatment process can improve alloy performance by changing its microstructure. The second generation single crystal alloy CMSX-4 was prepared by screw selecting method and low segregation technology. The homogenizing heat treatment was carried out in an antivacuum chamber oven and followed by air cooling (AC), in order to investigate the effect of heat treatment on microstructure and stress rupture properties. The results show that elemental segregation of alloy is obviously improved after multistage solid solution heat treatment 1280 degrees C, 1 h+1290 degrees C, 2 h+1300 degrees C, 6 h AC+1140 degrees C, 4 h AC+870 degrees C, 16 h AC (process 1). The rupture life of the alloy is 207.50 h under the condition of 980 degrees C/250 MPa and 280.84 h under the condition of 1070 degrees C/140 MPa. During heat treatment, homogenization micropores form in the solution process and the size of solidification micropores increases. These micropores are crack initiation points during the creep tests of the alloy. Elemental segregation of the alloy is also improved after over melting point heat treatment 1320 degrees C, 3 h AC+1140 degrees C, 4 h AC+870 degrees C, 16 h AC (process 2). It can be concluded that the homogenization effect of process 2 is not as good as that of process 1 by measuring the segregation coefficient. However, the rupture property performs well and the rupture life of the alloy is 293.08 h under the condition of 980 degrees C/250 MPa and 310.10 h under the condition of 1070 degrees C/140 MPa. The solid solution time of process 2 is shorter and the number of micropores is less.
Keywordsingle crystal superalloy heat treatment microstructure creep rupture property
Indexed BySCI
Language英语
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000509418200032
PublisherNORTHWEST INST NONFERROUS METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137389
Collection中国科学院金属研究所
Corresponding AuthorNing Likui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wang Huan,Ning Likui,Tong Jian,et al. Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4[J]. RARE METAL MATERIALS AND ENGINEERING,2020,49(1):247-256.
APA Wang Huan,Ning Likui,Tong Jian,Tan Zheng,Liu Enze,&Zheng Zhi.(2020).Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4.RARE METAL MATERIALS AND ENGINEERING,49(1),247-256.
MLA Wang Huan,et al."Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4".RARE METAL MATERIALS AND ENGINEERING 49.1(2020):247-256.
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