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Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime
Sun CQ(孙成奇)1,2; Chi, Weiqian3; Wang, Wenjing3; Duan, Yan4
Corresponding AuthorSun, Chengqi(scq@lnm.imech.ac.cn)
Source PublicationINTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
2021-09-01
Volume205Pages:8
ISSN0020-7403
AbstractIn this paper, very high cycle fatigue (VHCF) behavior of an additively manufactured (AM) Ti-6Al-4V by selective laser melting process and post-heat treated by hot-isostatic pressing is investigated by ultrasonic frequency fatigue test and rotating bending fatigue test. It is shown that the fatigue crack initiation is related to loading types in VHCF regime. Under rotating bending fatigue test, the fatigue crack initiates from specimen surface. While for ultrasonic frequency fatigue test, both the surface and the interior crack initiations are observed. For interior crack initiation, the fracture surface presents fish-eye like pattern and fine granular area (FGA) morphology. Electron backscatter diffraction and transmission electron microscopy observations indicate that there are discontinuous refined grain regions beneath the fracture surface in crack initiation and early growth region (i.e. FGA). It is proposed that the mechanism of crack initiation and early growth of titanium alloys in VHCF regime is attributed to the grain refinement caused by dislocation interaction over a number of cyclic loadings followed by cracks combined with the cracks formed at defects, alpha-phase, interfaces, etc. during cyclic loadings. The paper also indicates that the fatigue performance of the present AM Ti-6Al-4V is comparable to that of the conventionally processed Ti-6Al-4V.
KeywordVery high cycle fatigue Additively manufactured Ti-6Al-4V Selective laser melting Crack initiation mechanism Grain refinement
DOI10.1016/j.ijmecsci.2021.106591
Indexed BySCI ; EI
Language英语
WOS IDWOS:000683561300008
WOS KeywordHIGH-STRENGTH STEELS ; STRESS RATIO ; BEHAVIOR ; LIFE ; MICROSTRUCTURE ; PERFORMANCE ; COMPRESSOR ; ELECTRON
WOS Research AreaEngineering ; Mechanics
WOS SubjectEngineering, Mechanical ; Mechanics
Funding ProjectNational Natural Science Foundation of China[11988102] ; National Natural Science Foundation of China[91860112] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020200]
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
Classification一类
Ranking1
ContributorSun, Chengqi
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/87237
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
3.Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China;
4.Xian Bright Laser Technol Co Ltd, Xian 710117, Peoples R China
Recommended Citation
GB/T 7714
Sun CQ,Chi, Weiqian,Wang, Wenjing,et al. Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2021,205:8.
APA 孙成奇,Chi, Weiqian,Wang, Wenjing,&Duan, Yan.(2021).Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,205,8.
MLA 孙成奇,et al."Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 205(2021):8.
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