Creep-rupture behavior of a directionally solidified nickel-base superalloy

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	Creep-rupture behavior of a directionally solidified nickel-base superalloy
	J. T. Guo; C. Yuan; H. C. Yang; V. Lupinc; M. Maldini
	2001
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	32 期号:5 页码:1103-1110
摘要	The creep-rupture behavior of the directionally solidified (DS) nickel-base superalloy DZ17G has been investigated over a wide stress range of 60 to 950 MPa at high temperature (923 to 1323 K). In this article, the detailed creep deformation and fracture mechanisms at constant load have been studied. The results show that all creep curves exhibit a short primary and a dominant accelerated creep stage, which results in higher ductility of DS superalloy DZ17G compared to the conventionally cast alloy. From the creep parameters and transmission electron microscopy (TEM) observations, it is suggested that the dominant creep deformation mechanism has a change from gamma prime particles shearing by matrix dislocations in high stress region to dislocation climb process in low stress region. It is found that the fracture mode of DS superalloy DZ17G is transgranular, and it is controlled by the propagation rate of deep cracks initiated at both surface and inner microstructure discontinuities. The creep rupture data follows the Monkman-Grant relationship under all the explored test conditions.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china. northeastern univ, dept met & mat, shenyang 110006, peoples r china. cnr, tmepe, i-20125 milan, italy.;guo, jt (reprint author), chinese acad sci, inst met res, shenyang 110015, peoples r china
关键词	Single-crystals High-temperature Fracture Behavior Alloy Deformation Orientation Stresses Grain
URL	查看原文
WOS记录号	WOS:000168519600008
引用统计	被引频次：40[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/321006/36653
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. T. Guo,C. Yuan,H. C. Yang,et al. Creep-rupture behavior of a directionally solidified nickel-base superalloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2001,32(5):1103-1110.
APA	J. T. Guo,C. Yuan,H. C. Yang,V. Lupinc,&M. Maldini.(2001).Creep-rupture behavior of a directionally solidified nickel-base superalloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,32(5),1103-1110.
MLA	J. T. Guo,et al."Creep-rupture behavior of a directionally solidified nickel-base superalloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 32.5(2001):1103-1110.