Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy

doi:10.1111/ffe.12562

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy
	Su, H.; Liu, X.; Sun CQ(孙成奇); Hong YS(洪友士); Hong, Y (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing, Peoples R China.; Hong, Y (reprint author), Univ Chinese Acad Sci, Beijing, Peoples R China.
刊名	FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
	2017-06-01
卷号	40 期号:6 页码:979-993
关键词	Crack Initiation Fatigue Life Nanograins Ti-6al-4v Alloy Very-high-cycle Fatigue
ISSN号	8756-758X
DOI	10.1111/ffe.12562
文献子类	Article
英文摘要	The microstructural features and the fatigue propensities of interior crack initiation region for very-high-cycle fatigue (VHCF) of a Ti-6Al-4V alloy were investigated in this paper. Fatigue tests under different stress ratios of R=-1, -0.5, -0.1, 0.1 and 0.5 were conducted by ultrasonic axial cycling. The observations by SEM showed that the crack initiation of VHCF presents a fish-eye (FiE) morphology containing a rough area (RA), and the FiE and RA are regarded as the characteristic regions for crack initiation of VHCF. Further examinations by TEM revealed that a layer of nanograins exists in the RA for the case of R=-1, while nanograins do not appear in the FiE outside RA for the case of R=-1, and in the RA for the case of R=0.5, which is explained by the Numerous Cyclic Pressing model. In addition, the estimations of the fatigue propensities for interior crack initiation stage of VHCF indicated that the fatigue life consumed by RA takes a dominant part of the total fatigue life and the related crack propagation rate is rather slow.
分类号	二类/Q1
WOS关键词	HIGH-STRENGTH STEELS ; STRESS RATIO ; BEARING STEEL ; N-GREATER-THAN-10(7) CYCLES ; METALLIC MATERIALS ; BEHAVIOR ; LIFE ; MECHANISM ; PROPAGATION ; FAILURE
WOS研究方向	Engineering ; Materials Science
语种	英语
WOS记录号	WOS:000400608100011
资助机构	National Natural Science Foundation of China(11572325 ; 11202210)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/60907]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Hong, Y (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing, Peoples R China.; Hong, Y (reprint author), Univ Chinese Acad Sci, Beijing, Peoples R China.
推荐引用方式 GB/T 7714	Su, H.,Liu, X.,Sun CQ,et al. Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy[J]. FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES,2017,40(6):979-993.
APA	Su, H.,Liu, X.,孙成奇,洪友士,Hong, Y ,&Hong, Y .(2017).Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy.FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES,40(6),979-993.
MLA	Su, H.,et al."Nanograin layer formation at crack initiation region for very-high-cycle fatigue of a Ti-6Al-4V alloy".FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES 40.6(2017):979-993.