Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4

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	Effect of Heat Treatment on Microstructures and Stress Rupture Properties in the Nickel Base Single Crystal Superalloy CMSX-4
	Wang Huan 1,2; Ning Likui 1; Tong Jian 1; Tan Zheng 1; Liu Enze 1; Zheng Zhi 1
刊名	RARE METAL MATERIALS AND ENGINEERING
	2020
卷号	49 期号:1 页码:247-256
关键词	single crystal superalloy heat treatment microstructure creep rupture property
ISSN号	1002-185X
通讯作者	Ning Likui(lkning@imr.ac.cn)
英文摘要	Nickel 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.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	NORTHWEST INST NONFERROUS METAL RESEARCH
WOS记录号	WOS:000509418200032
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/137388]
专题	金属研究所_中国科学院金属研究所
通讯作者	Ning Likui
作者单位	1.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
推荐引用方式 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.