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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.
Source PublicationFATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
2017-06-01
Volume40Issue:6Pages:979-993
ISSN8756-758X
AbstractThe 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.
KeywordCrack Initiation Fatigue Life Nanograins Ti-6al-4v Alloy Very-high-cycle Fatigue
DOI10.1111/ffe.12562
Indexed BySCI ; EI
Language英语
WOS IDWOS:000400608100011
WOS KeywordHIGH-STRENGTH STEELS ; STRESS RATIO ; BEARING STEEL ; N-GREATER-THAN-10(7) CYCLES ; METALLIC MATERIALS ; BEHAVIOR ; LIFE ; MECHANISM ; PROPAGATION ; FAILURE
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China(11572325 ; 11202210)
DepartmentLNM金属材料微结构与力学性能
Classification二类/Q1
Ranking1
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/60907
Collection非线性力学国家重点实验室
Corresponding AuthorHong, 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.
Recommended Citation
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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