On the role of mu phase during high temperature creep of a second generation directionally solidified superalloy

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	On the role of mu phase during high temperature creep of a second generation directionally solidified superalloy
	D. Wang; J. Zhang; L. H. Lou
	2010
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	527 期号:20 页码:5161-5166
摘要	The role of mu phase in a second generation directionally solidified Ni-base superalloy during high temperature creep has been characterized in the present work. A large amount of blocky mu phase enveloped by thick gamma'-film is found at the grain boundaries and in the vicinity of primary MC carbides after heat treatment. However, the creep-rupture properties of the alloy are not affected by the presence of the blocky p, phase at 760-1070 degrees C under a stress of 120-850 MPa. By the investigation of creep microstructure at 975 degrees C/255 MPa, it is found that the thick gamma'-film plays a pivotal role in toughening the grain boundaries and the interfaces between the mu phase (or carbides) particles and the matrix, and preventing the formation of cracks. Meanwhile, during high temperature creep, M(23)C(6) carbides are continuously coarsening with the dissolution of the p. phase particles and MC carbides, especially at the grain boundaries. The poor interface cohesion strength between such large M(23)C(6) carbides and the gamma matrix at the vertical segments of the directionally solidified grain boundaries leads to the final creep failure of the present alloy. (C) 2010 Elsevier B.V. All rights reserved.
部门归属	[wang, d.; lou, l. h.] chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. [zhang, j.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;wang, d (reprint author), chinese acad sci, inst met res, superalloys div, 72 wenhua rd, shenyang 110016, peoples r china;dwang@imr.ac.cn
关键词	Mu Phase Directionally Solidified Ni-base Superalloy Creep Carbide Grain Boundaries Precipitation
URL	查看原文
WOS记录号	WOS:000279756400015
引用统计	被引频次：27[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/321006/31491
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. Wang,J. Zhang,L. H. Lou. On the role of mu phase during high temperature creep of a second generation directionally solidified superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2010,527(20):5161-5166.
APA	D. Wang,J. Zhang,&L. H. Lou.(2010).On the role of mu phase during high temperature creep of a second generation directionally solidified superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,527(20),5161-5166.
MLA	D. Wang,et al."On the role of mu phase during high temperature creep of a second generation directionally solidified superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 527.20(2010):5161-5166.