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An experimental investigation of fatigue performance and crack initiation characteristics for an SLMed Ti-6Al-4V under different stress ratios up to very-high-cycle regime

文献类型：期刊论文

作者Fu, Rui2; Zheng, Liang2; Ling, Chao2; Zhong, Zheng2; Hong, Youshi1; Hong YS(洪友士)
刊名INTERNATIONAL JOURNAL OF FATIGUE
出版日期2022-11-01
卷号164页码:14
ISSN号0142-1123
关键词Selective laser melting Ti-6Al-4V Very-high-cycle fatigue Crack initiation Stress intensity factor
DOI10.1016/j.ijfatigue.2022.107119
通讯作者Zhong, Zheng(zhongzheng@hit.edu.cn) ; Hong, Youshi(hongys@imech.ac.cn)
英文摘要The fatigue behavior of SLMed Ti-6Al-4V has been intensively investigated in recent years. However, the effect of stress ratio has not been comprehensively studied, especially in VHCF regime. In this paper, the fatigue per-formance and crack initiation characteristics up to VHCF regime for an SLMed Ti-6Al-4V at various stress ratios (R =-1,-0.5, 0.1 and 0.5) were investigated and the effects of stress ratio were substantially discussed. The stress amplitude decreases with the increase of stress ratio with the order of: sigma(a) (R =-1) > sigma(a) (R =-0.5) > sigma(a) (R = 0.1) > sigma(a) (R = 0.5). Internal crack initiation is dominant in HCF and VHCF regimes under the four stress ratios, although surface crack initiation rarely occurs in HCF regime at R =-1 and 0.5. Whether the crack initiates from subsurface or from interior is affected by the applied maximum stress, and the crack initiation is in relation not only to defect size but also to defect location. The nanograins in RA are evidently formed in VHCF regime at R =-1,-0.5 and 0.1, but not at R = 0.5, which is well explained by the NCP model.
WOS关键词ADDITIVELY MANUFACTURED TI-6AL-4V ; MECHANICAL-PROPERTIES ; TENSILE PROPERTIES ; HEAT-TREATMENT ; N-GREATER-THAN-10(7) CYCLES ; BUILD ORIENTATION ; EARLY GROWTH ; PART I ; LASER ; MICROSTRUCTURE
资助项目National Natural Science Foundation of China[11932005] ; National Natural Science Foundation of China[11932020] ; Shenzhen Fundamental Research Program[JCYJ20180306171946292]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:000835270000001
资助机构National Natural Science Foundation of China ; Shenzhen Fundamental Research Program
源URL[http://dspace.imech.ac.cn/handle/311007/89837]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Zhong, Zheng; Hong, Youshi
作者单位1.Chinese Acad Sci, Inst Mech, LNM, Beijing, Peoples R China
2.Harbin Inst Technol Shenzhen, Sch Sci, Shenzhen, Peoples R China
推荐引用方式
GB/T 7714		 Fu, Rui,Zheng, Liang,Ling, Chao,et al. An experimental investigation of fatigue performance and crack initiation characteristics for an SLMed Ti-6Al-4V under different stress ratios up to very-high-cycle regime[J]. INTERNATIONAL JOURNAL OF FATIGUE,2022,164:14.
APA Fu, Rui,Zheng, Liang,Ling, Chao,Zhong, Zheng,Hong, Youshi,&洪友士.(2022).An experimental investigation of fatigue performance and crack initiation characteristics for an SLMed Ti-6Al-4V under different stress ratios up to very-high-cycle regime.INTERNATIONAL JOURNAL OF FATIGUE,164,14.
MLA Fu, Rui,et al."An experimental investigation of fatigue performance and crack initiation characteristics for an SLMed Ti-6Al-4V under different stress ratios up to very-high-cycle regime".INTERNATIONAL JOURNAL OF FATIGUE 164(2022):14.

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来源：力学研究所

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