High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951

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	High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951
	Z. K. Chu; J. J. Yu; X. F. Sun; H. R. Guan; Z. Q. Hu
	2009
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	40A 期号:12 页码:2927-2937
摘要	The high-temperature creep deformation and fracture behavior of a directionally solidified Ni-base superalloy DZ951 have been investigated over a wide stress range of 110 to 880 MPa at high temperatures (700 degrees C to 1000 degrees C). In this article, the detailed creep deformation and fracture mechanism have been studied. The results show that the creep curves exhibit strong temperature dependence. From transmission election microscopy (TEM) observations, it is suggested that the deformation mechanism is temperature dependent and mainly consists of three dislocation-controlling mechanisms: stacking faults and dislocation-pair shearing, dislocation bowing, and dislocation climbing. It is found that the fracture mode of DZ951 alloy changes from cleavagelike fracture at low temperature to ductile fracture at high temperature. At 700 degrees C, the creep cracks mainly initiate at the surface and propagate along the cleavagelike facets. With increasing temperature, cracks can initiate at the surface, carbide/matrix interface, and cast pore. The growth of microcrack has a direction perpendicular to the stress direction. The creep-rupture data follow the Monkman-Grant relationship in different temperature regions.
部门归属	[chu, zhaokuang; yu, jinjiang; sun, xiaofeng; guan, hengrong; hu, zhuangqi] chinese acad sci, inst met res, shenyang 110016, peoples r china.;chu, zk (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china;zkchu@imr.ac.cn
关键词	Single-crystal Superalloy Dislocation Reactions Stress-rupture Crack-growth Nimonic 80a Mechanisms Grain Orientation Gtd-111 Alloy
URL	查看原文
WOS记录号	WOS:000271282700018
引用统计	被引频次：23[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/321006/31852
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. K. Chu,J. J. Yu,X. F. Sun,et al. High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2009,40A(12):2927-2937.
APA	Z. K. Chu,J. J. Yu,X. F. Sun,H. R. Guan,&Z. Q. Hu.(2009).High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,40A(12),2927-2937.
MLA	Z. K. Chu,et al."High-Temperature Creep Deformation and Fracture Behavior of a Directionally Solidified Ni-Base Superalloy DZ951".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 40A.12(2009):2927-2937.