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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

文献类型：期刊论文

作者Sun CQ(孙成奇)3,4; Chi, Weiqian2; Wang, Wenjing2; Duan, Yan1
刊名INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
出版日期2021-09-01
卷号205页码:8
ISSN号0020-7403
关键词Very high cycle fatigue Additively manufactured Ti-6Al-4V Selective laser melting Crack initiation mechanism Grain refinement
DOI10.1016/j.ijmecsci.2021.106591
通讯作者Sun, Chengqi(scq@lnm.imech.ac.cn)
英文摘要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.
分类号一类
WOS关键词HIGH-STRENGTH STEELS ; STRESS RATIO ; BEHAVIOR ; LIFE ; MICROSTRUCTURE ; PERFORMANCE ; COMPRESSOR ; ELECTRON
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]
WOS研究方向Engineering ; Mechanics
语种英语
WOS记录号WOS:000683561300008
资助机构National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者Sun, Chengqi
源URL[http://dspace.imech.ac.cn/handle/311007/87236]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Xian Bright Laser Technol Co Ltd, Xian 710117, Peoples R China
2.Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing 100044, Peoples R China;
3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China;
4.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, 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.

入库方式： OAI收割

来源：力学研究所

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