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Defect-induced cracking and fine granular characteristics in very-high-cycle fatigue of laser powder bed fusion AlSi10Mg alloy

文献类型：期刊论文

作者Li, Jianghua3; Sun, Jingyu3; Qian, Guian3; Shi, Liting1,2; Qian GA(钱桂安)
刊名INTERNATIONAL JOURNAL OF FATIGUE
出版日期2022-05-01
卷号158页码:14
ISSN号0142-1123
关键词Laser powder bed fusion Very-high-cycle fatigue Defect-induced crack Grain refinement Misorientation
DOI10.1016/j.ijfatigue.2022.106770
通讯作者Sun, Jingyu(sunjingyu@imech.ac.cn) ; Qian, Guian(qianguian@imech.ac.cn)
英文摘要The evolution of defects during very-high-cycle fatigue (VHCF) is important for assessing the lifetime of AlSi10Mg alloy produced by laser powder bed fusion. In the study, VHCF experiments were carried out with an ultrasonic fatigue machine at a stress ratio of -1. Detailed characteristics of short cracks in VHCF were investigated by metallographic serial sections using scanning electron microscope and electron backscatter diffraction. Results show that the defects with nominal stress of 49-60 MPa have different degrees of cracking. As a result of the difference in defect shape, nominal stress and microstructure, fatigue cracks exhibit different cracking modes and propagation paths. Grain refinement behavior occurs at short cracks under VHCF, and the heterogeneous distribution of fine grains underneath the crack surfaces is strongly related to the as-printed microstructure and crack propagation path. Statistical analysis suggests that regardless of the crystal orientation, the misorientation between fine grains and matrix grains tends to be 40-50. The average crack growth rate in VHCF is approximately in the range of 10(-12 )~ 10(-10) m/Cycle.
WOS关键词FORMATION MECHANISM ; GROWTH ; INITIATION ; MICROSTRUCTURE ; BEHAVIOR ; THERMOGRAPHY ; PLASTICITY ; TI-6AL-4V ; DAMAGE ; STEEL
资助项目National Natural Science Foundation of China[11872364] ; National Natural Science Foundation of China[12002185] ; National Natural Science Foundation of China[11932020] ; National Natural Science Foundation of China[12072345] ; CAS Pioneer Hundred Talents Program
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:000792826400001
资助机构National Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program
源URL[http://dspace.imech.ac.cn/handle/311007/89333]  
专题力学研究所_非线性力学国家重点实验室
通讯作者Sun, Jingyu; Qian, Guian
作者单位1.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
2.China Automot Technol & Res Ctr Co Ltd, 68 East Xianfeng Rd, Tianjin 300300, Peoples R China
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Li, Jianghua,Sun, Jingyu,Qian, Guian,et al. Defect-induced cracking and fine granular characteristics in very-high-cycle fatigue of laser powder bed fusion AlSi10Mg alloy[J]. INTERNATIONAL JOURNAL OF FATIGUE,2022,158:14.
APA Li, Jianghua,Sun, Jingyu,Qian, Guian,Shi, Liting,&钱桂安.(2022).Defect-induced cracking and fine granular characteristics in very-high-cycle fatigue of laser powder bed fusion AlSi10Mg alloy.INTERNATIONAL JOURNAL OF FATIGUE,158,14.
MLA Li, Jianghua,et al."Defect-induced cracking and fine granular characteristics in very-high-cycle fatigue of laser powder bed fusion AlSi10Mg alloy".INTERNATIONAL JOURNAL OF FATIGUE 158(2022):14.

入库方式： OAI收割

来源：力学研究所

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