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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.
2017-06-01
发表期刊FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
卷号40期号:6页码:979-993
ISSN8756-758X
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.
关键词Crack Initiation Fatigue Life Nanograins Ti-6al-4v Alloy Very-high-cycle Fatigue
DOI10.1111/ffe.12562
收录类别SCI ; EI
语种英语
WOS记录号WOS:000400608100011
关键词[WOS]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
WOS类目Engineering, Mechanical ; Materials Science, Multidisciplinary
项目资助者National Natural Science Foundation of China(11572325 ; 11202210)
课题组名称LNM金属材料微结构与力学性能
论文分区二类/Q1
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/60907
专题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.
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