IMECH-IR  > 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 JH(李江华)1; Sun JY(孙经雨)1; Qian GA(钱桂安)1; Shi LT2,3
Corresponding AuthorSun, Jingyu(sunjingyu@imech.ac.cn) ; Qian, Guian(qianguian@imech.ac.cn)
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2022-05-01
Volume158Pages:14
ISSN0142-1123
AbstractThe 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.
KeywordLaser powder bed fusion Very-high-cycle fatigue Defect-induced crack Grain refinement Misorientation
DOI10.1016/j.ijfatigue.2022.106770
Indexed BySCI ; EI
Language英语
WOS IDWOS:000792826400001
WOS KeywordFORMATION MECHANISM ; GROWTH ; INITIATION ; MICROSTRUCTURE ; BEHAVIOR ; THERMOGRAPHY ; PLASTICITY ; TI-6AL-4V ; DAMAGE ; STEEL
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding ProjectNational 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
Funding OrganizationNational Natural Science Foundation of China ; CAS Pioneer Hundred Talents Program
Classification一类
Ranking1
ContributorSun, Jingyu ; Qian, Guian
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/89334
Collection非线性力学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China;
2.China Automot Technol & Res Ctr Co Ltd, 68 East Xianfeng Rd, Tianjin 300300, Peoples R China;
3.Tianjin Univ, Sch Mat Sci & Engn, Tianjin 300072, Peoples R China
Recommended Citation
GB/T 7714
Li JH,Sun JY,Qian GA,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 李江华,孙经雨,钱桂安,&Shi LT.(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 李江华,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.
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