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

doi:10.1016/j.ijfatigue.2022.106770

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Defect-induced cracking and fine granular characteristics in very-high-cycle fatigue of laser powder bed fusion AlSi10Mg alloy
	Li, Jianghua 3; Sun, Jingyu 3; Qian, Guian 3; Shi, Liting 1,2
刊名	INTERNATIONAL JOURNAL OF FATIGUE
	2022-05-01
卷号	158 页码:14
关键词	Laser powder bed fusion Very-high-cycle fatigue Defect-induced crack Grain refinement Misorientation
ISSN号	0142-1123
DOI	10.1016/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.
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关键词	FORMATION MECHANISM ; GROWTH ; INITIATION ; MICROSTRUCTURE ; BEHAVIOR ; THERMOGRAPHY ; PLASTICITY ; TI-6AL-4V ; DAMAGE ; STEEL
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
内容类型	期刊论文
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.(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.