| 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
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| Corresponding Author | Sun, Chengqi([email protected]) |
| Source Publication | INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
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| 2021-09-01 | |
| Volume | 205Pages:8 |
| ISSN | 0020-7403 |
| Abstract | 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. |
| Keyword | Very high cycle fatigue Additively manufactured Ti-6Al-4V Selective laser melting Crack initiation mechanism Grain refinement |
| DOI | 10.1016/j.ijmecsci.2021.106591 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000683561300008 |
| WOS Keyword | HIGH-STRENGTH STEELS ; STRESS RATIO ; BEHAVIOR ; LIFE ; MICROSTRUCTURE ; PERFORMANCE ; COMPRESSOR ; ELECTRON |
| WOS Research Area | Engineering ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Mechanics |
| Funding Project | 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] |
| Funding Organization | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Sun, Chengqi |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/87237 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 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 |
| 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.Rp_Au:Sun, Chengqi |
| 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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| Jp2021F365.pdf（4522KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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