Effect of Threshold Stress on Anisotropic Creep Properties of Single Crystal Nickel-Base Superalloy SRR99

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	Effect of Threshold Stress on Anisotropic Creep Properties of Single Crystal Nickel-Base Superalloy SRR99
	G. M. Han; J. J. Yu; X. F. Sun; Z. Q. Hu
	2012
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	28 期号:5 页码:439-445
摘要	The influence of orientation on the creep properties of the nickel-base single crystal superalloy SRR99 was investigated at 760 degrees C and various levels of applied stress. It was found that the effect of anisotropy was strikingly prominent at this temperature. Deformation mechanisms of single crystals with three principal orientations at 760 degrees C/790 M Pa were explained according to detailed observations of dislocation arrangements by means of transmission electron microscopy (TEM). Liability to shearing gamma' precipitates for [011] orientation and co-planar slip for [(1) over bar 11] orientation resulted in poor creep strength and short stress rupture life. It was also found that the apparent primary creep strain could be measured when the applied stress was increased to 565 MPa. Modified power law equation was adopted and the concept of a threshold stress sigma(0) which determines dislocation looping or shearing to be activated was then involved. Through detailed calculations, the threshold stress was obtained to further analyse the distribution of the applied stress and better rationalize the anisotropic creep behaviour in the stereographic triangle in combination with TEM observations.
部门归属	[han, guoming; yu, jinjiang; sun, xiaofeng; hu, zhuangqi] chinese acad sci, inst met res, shenyang 110016, peoples r china.;han, gm (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.;gmhan@imr.ac.cn
关键词	Single Crystal Superalloy Anisotropic Creep Threshold Stress Deformation Mechanism High-temperature Creep Steady-state Creep Friction Stress Stacking-faults Cmsx-4 Orientation Recovery Dependence Mechanisms Behavior
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/59985
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. M. Han,J. J. Yu,X. F. Sun,et al. Effect of Threshold Stress on Anisotropic Creep Properties of Single Crystal Nickel-Base Superalloy SRR99[J]. Journal of Materials Science & Technology,2012,28(5):439-445.
APA	G. M. Han,J. J. Yu,X. F. Sun,&Z. Q. Hu.(2012).Effect of Threshold Stress on Anisotropic Creep Properties of Single Crystal Nickel-Base Superalloy SRR99.Journal of Materials Science & Technology,28(5),439-445.
MLA	G. M. Han,et al."Effect of Threshold Stress on Anisotropic Creep Properties of Single Crystal Nickel-Base Superalloy SRR99".Journal of Materials Science & Technology 28.5(2012):439-445.