Effect of Long-term Thermal Exposure on Microstructure and Stress Rupture Properties of GH3535 Superalloy

被引：78
|
作者：
Liu, T. [1 ,2 ]
Dong, J. S. [2 ]
Wang, L. [2 ]
Li, Z. J. [4 ]
Zhou, X. T. [4 ]
Lou, L. H. [2 ]
Zhang, J. [2 ,3 ]
机构：
[1] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China
[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
[3] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
[4] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2015年 / 31卷 / 03期
基金：
国家高技术研究发展计划(863计划);
关键词：
GH3535; superalloy; Long term thermal exposure; Microstructure; Carbide; M6C; M12C; Stress rupture properties; NICKEL-BASE SUPERALLOY; CARBIDE; EVOLUTION;
D O I：
10.1016/j.jmst.2014.07.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The evolution of microstructure and the stress rupture properties of long term thermally exposed GH3535 alloy have been investigated. It was found that M6C carbides presented in the solid solution heat treated samples. During long term thermal exposure at 700 degrees C, fine M12C carbides precipitated preferentially at grain boundaries. These carbides coexisted with the pre-exiting M6C. The stress rupture life of 700 degrees C/1000 h exposed sample under creep testing at 650 degrees C/324 MPa is 93 h. It is much longer than that of the solid solution samples. No noticeable changes could be detected in both the microstructure and stress rupture lives when the samples were exposed for time longer than 1000 h M12C carbides were found to be beneficial to the creep properties. The cracks initiated at the interface of M6C carbides and matrix, which led to a lower creep rupture life. Copyright (C) 2015, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited. All rights reserved.
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页码：269 / 279
页数：11
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