Effect of creep and oxidation on reduced fatigue life of Ni-based alloy 617 at 850 degrees C

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	Effect of creep and oxidation on reduced fatigue life of Ni-based alloy 617 at 850 degrees C
	X. Chen; Z. Q. Yang; M. A. Sokolov; D. L. Erdman; K. Mo; J. F. Stubbins
	2014
发表期刊	Journal of Nuclear Materials
ISSN	0022-3115
卷号	444 期号:1-3 页码:393-403
摘要	Low cycle fatigue (LCF) and creep-fatigue testing of Ni-based alloy 617 was carried out at 850 degrees C. Compared with its LCF life, the material's creep-fatigue life decreases to different extents depending on test conditions. To elucidate the microstructure-fatigue property relationship for alloy 617 and the effect of creep and oxidation on its fatigue life, systematic microstructural investigations were carried out using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and electron backscatter diffraction (EBSD). In LCF tests, as the total strain range increased, deformations concentrated near high angle grain boundaries (HAGBs). The strain hold period in the creep-fatigue tests introduced additional creep damage to the material, which revealed the detrimental effect of the strain hold time on the material fatigue life in two ways. First, the strain hold time enhanced the localized deformation near HAGBs, resulting in the promotion of intergranular cracking of alloy 617. Second, the strain hold time encouraged grain boundary sliding, which resulted in interior intergranular cracking of the material. Oxidation accelerated the initiation of intergranular cracking in alloy 617. In the crack propagation stage, if oxidation was promoted and the cyclic oxidation damage was greater than the fatigue damage, oxidation-assisted intergranular crack growth resulted in a significant reduction in the material's fatigue life, (C) 2013 Elsevier B.V. All rights reserved.
部门归属	[chen, xiang ; mo, kun ; stubbins, james f.] univ illinois, dept nucl plasma & radiol engn, urbana, il 61801 usa. [chen, xiang ; yang, zhiqing ; sokolov, mikhail a. ; erdman, donald l., iii] oak ridge natl lab, oak ridge, tn 37831 usa. [yang, zhiqing] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; chen, x (reprint author), 1 bethel valley rd,pob 2008,bldg 4500s,ms-6151, oak ridge, tn 37831 usa. ; chenx@ornl.gov
关键词	Boundary-character-distribution Crack-growth Behavior Low-cycle Fatigue Structural-materials Rupture Behavior Haynes 230 Hold-time Temperature Superalloy Inconel-617
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72343
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Chen,Z. Q. Yang,M. A. Sokolov,et al. Effect of creep and oxidation on reduced fatigue life of Ni-based alloy 617 at 850 degrees C[J]. Journal of Nuclear Materials,2014,444(1-3):393-403.
APA	X. Chen,Z. Q. Yang,M. A. Sokolov,D. L. Erdman,K. Mo,&J. F. Stubbins.(2014).Effect of creep and oxidation on reduced fatigue life of Ni-based alloy 617 at 850 degrees C.Journal of Nuclear Materials,444(1-3),393-403.
MLA	X. Chen,et al."Effect of creep and oxidation on reduced fatigue life of Ni-based alloy 617 at 850 degrees C".Journal of Nuclear Materials 444.1-3(2014):393-403.