The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure

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	The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure
	J. Wang; L. Z. Zhou; L. Y. Sheng; J. T. Guo
	2012
发表期刊	Materials & Design
ISSN	0261-3069
卷号	39 页码:55-62
摘要	The microstructure evolution and its influence on the mechanical properties are investigated in a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure. It is found that the tertiary gamma' phase disappears and the secondary gamma' phase coarsens and coalesces gradually, which acts as the main reason for the decreasing of strength at both room temperature and 900 degrees C. During exposure, the grain boundary coarsens from discontinuous to half-continuous and finally to continuous structure. The optimum half-continuous grain boundary structure composed of discrete M23C6 and M3B2 wrapped by gamma' film leads to the elongation peak at room temperature in the thermally exposed specimens. At 900 degrees C, the increase in the elongation is attributed to the much softer matrix and the formation of microvoids. The behavior of primary MC decomposition is a diffusion-controlled process. During exposure, various derivative phases including M23C6, gamma', eta, M6C and sigma sequentially form in the decomposed region. Primary MC decomposition and the precipitation of sigma phase have little effect on the mechanical properties due to their low volume fractions. (C) 2012 Elsevier Ltd. All rights reserved.
部门归属	[wang, jian; zhou, lanzhang; guo, jianting] chinese acad sci, inst met res, shenyang 110016, peoples r china. [sheng, liyuan] peking univ, coll engn, beijing 100871, peoples r china. [sheng, liyuan] shenzhen hongkong inst, pku hkust, shenzhen 518057, peoples r china.;zhou, lz (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.;lzz@imr.ac.cn
关键词	Ferrous Metals And Alloys Heat Treatments Microstructure Single-crystal Phase Instabilities Additions Alloy
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60291
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Wang,L. Z. Zhou,L. Y. Sheng,et al. The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure[J]. Materials & Design,2012,39:55-62.
APA	J. Wang,L. Z. Zhou,L. Y. Sheng,&J. T. Guo.(2012).The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure.Materials & Design,39,55-62.
MLA	J. Wang,et al."The microstructure evolution and its effect on the mechanical properties of a hot-corrosion resistant Ni-based superalloy during long-term thermal exposure".Materials & Design 39(2012):55-62.