Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy

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	Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy
	L. Shui; T. Jin; S. G. Tian; Z. Q. Hu
	2007
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	454 页码:461-466
摘要	The influence of the gamma' precipitate morphology on the creep properties of [001]-orientated specimens of a nickel-base single crystal superalloy has been investigated. Specimens with two different gamma'microstructures, namely as-heat treated crystals with cuboidal gamma' particles and crystals given a compression pre-treatment to form a raft gamma' microstructure orientated parallel to the stress axis, were crept at 800 and 1000 degrees C. The analysis of the experiments show that, at 800 degrees C and 600 MPa, the alloy with cuboidal gamma' precipitates exhibited both lower creep rates and longer rupture lives compared to those with rafted gamma'. TEM examination showed that, in addition to {111} (110) -slip system operated in gamma matrix, the gamma' precipitates are cut by superlattice dislocations and stacking fault. It indicated that dislocations could shear the semi-coherent gamma' rafts relatively easily compared to the coherent cuboidal gamma'. At 1000 degrees C and 200MPa, the alloy with raft gamma' microstructure exhibited an extremely low minimum creep rate and longer rupture life. The dislocations movement by the combination of climbing and gliding processes and the glide-climb along gamma/gamma' vertical interfaces are impeded most strongly. This indicates that the rafted structure is beneficial to improving creep resistance of the alloy under the test condition. (c) 2006 Elsevier B.V. All rights reserved.
部门归属	chinese acad sci, inst met res, superalloys div, shenyang 110016, peoples r china. shenyang univ technol, sch mat sci & engn, shenyang 110023, peoples r china. shenyang univ technol, sch mat sci & engn, shenyang 110168, peoples r china.;shui, l (reprint author), chinese acad sci, inst met res, superalloys div, 72 wenhua rd, shenyang 110016, peoples r china;dcbsy@yahoo.com.cn
关键词	Ni-base Single Crystal Superalloy Tensile Creep Compression Pre-treatment Dislocation Behavior
URL	查看原文
WOS记录号	WOS:000245898500063
引用统计	被引频次：63[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/321006/33807
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Shui,T. Jin,S. G. Tian,et al. Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2007,454:461-466.
APA	L. Shui,T. Jin,S. G. Tian,&Z. Q. Hu.(2007).Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,454,461-466.
MLA	L. Shui,et al."Influence of precipitate morphology on tensile creep of a single crystal nickel-base superalloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 454(2007):461-466.