The microstructural instability of a hot corrosion resistant superalloy during long-term exposure

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	The microstructural instability of a hot corrosion resistant superalloy during long-term exposure
	J. S. Hou; J. T. Guo; G. X. Yang; L. Z. Zhou; X. Z. Qin; H. Q. Ye
	2008
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	498 期号:1-2 页码:349-358
摘要	In this paper, the changes in microstructure during high temperature exposure with and without applied stress have been studied. In the absence of applied stress, the factors associated with microstructural instability of the alloy include the coarsening of gamma', the formation of sigma and mu phase, the precipitation of P phase from sigma phase, the formation of M(23)C(6) from decomposed MC, and the precipitation of M(23)C(6) in gamma matrix. The sigma phase nucleates in the gamma matrix or on M(23)C(6) carbides that form during aging, with the last stage of growth involving interactions with gamma'. The nucleation and growth of sigma phase in the absence of applied stress are discussed in terms of structural analysis, activation energy, and elemental distribution. In the condition of under applied stress, when the superalloy exhibits a rafted gamma' morphology after long-term exposure, the microstructure is free of sigma phase until the samples are plastically strained to fracture; however, a larger number of small new nucleated gamma' precipitates are observed in gamma channels when gamma' particles remain cubic shape with sharp corners under the condition of high applied stress. In addition, the alloy shows formation of sigma phase in this situation. The formation of sigma phase as well as the formation of small spherical gamma' is discussed in terms of energy dynamics. (C) 2008 Elsevier B.V. All rights reserved.
部门归属	[hou, j. s.; guo, j. t.; zhou, l. z.; qin, x. z.; ye, h. q.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [yang, g. x.] xian univ technol, sch mat sci & engn, xian 710048, peoples r china.;hou, js (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;jshou@imr.ac.cn
关键词	Microstructural Instability Long-term Exposure Applied Stress Topologically Close-packed Phase Activation Energy Structural Analysis Nickel-base Superalloys High-temperature Creep Single-crystals Precipitation Mechanism Systems Alloys Stress Phase
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WOS记录号	WOS:000261420500050
引用统计	被引频次：29[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32808
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. S. Hou,J. T. Guo,G. X. Yang,et al. The microstructural instability of a hot corrosion resistant superalloy during long-term exposure[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2008,498(1-2):349-358.
APA	J. S. Hou,J. T. Guo,G. X. Yang,L. Z. Zhou,X. Z. Qin,&H. Q. Ye.(2008).The microstructural instability of a hot corrosion resistant superalloy during long-term exposure.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,498(1-2),349-358.
MLA	J. S. Hou,et al."The microstructural instability of a hot corrosion resistant superalloy during long-term exposure".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 498.1-2(2008):349-358.