Characteristic and mechanism of crack initiation and early growth of an additively manufactured Ti-6Al-4V in very high cycle fatigue regime

doi:10.1016/j.ijmecsci.2021.106591

IMECH-IR > 非线性力学国家重点实验室

	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, Weiqian 3; Wang, Wenjing 3; Duan, Yan 4
通讯作者	Sun, Chengqi(scq@lnm.imech.ac.cn)
发表期刊	INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
	2021-09-01
卷号	205 页码:8
ISSN	0020-7403
摘要	In 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.
关键词	Very high cycle fatigue Additively manufactured Ti-6Al-4V Selective laser melting Crack initiation mechanism Grain refinement
DOI	10.1016/j.ijmecsci.2021.106591
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000683561300008
关键词[WOS]	HIGH-STRENGTH STEELS ; STRESS RATIO ; BEHAVIOR ; LIFE ; MICROSTRUCTURE ; PERFORMANCE ; COMPRESSOR ; ELECTRON
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
资助项目	National Natural Science Foundation of China[11988102] ; National Natural Science Foundation of China[91860112] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020200]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
论文分区	一类
力学所作者排名	1
RpAuthor	Sun, Chengqi
引用统计	被引频次：38[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/87237
专题	非线性力学国家重点实验室
作者单位	1.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
推荐引用方式 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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