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Fatigue mechanism of medium-carbon steel welded joint: Competitive impacts of various defects
Wang, D. Q. Q.1,2,3; Yao, D. D.4; Gao, Z. B.4; Wang, Q.3; Zhang, Z. F.3; Li, X. W.1,2
Corresponding AuthorWang, Q.(gmwang@imr.ac.cn) ; Zhang, Z. F.(zhfzhang@imr.ac.cn) ; Li, X. W.(xwli@mail.neu.edu.cn)
2021-10-01
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
ISSN0142-1123
Volume151Pages:11
AbstractFatigue of welded joint is a scientific issue of great significance, because welding process always causes the loss of fatigue strength up to 40-60% for welded joint of the key components, resulting in a relatively poor reliability in service. In the present work, the fatigue behavior and damage mechanism of a medium-carbon steel welded joint were systematically investigated by microstructure observation and fatigue tests. It was found that, for the medium-carbon steel welded joint, fatigue crack mainly initiated at the welding defects, e.g., welding porosity, slag inclusion and heterogeneous microstructure with a poor mechanical property (i.e., the network-block proeutectoid ferrite). The competitive impact of various defects on the fatigue damage behaviors of welded joint was discussed, i.e., the competition between the volume defects (e.g., porosity and inclusions) and the heterogeneous structure. It is revealed that the smaller surface defects are more susceptible to fatigue damage due to the low constraint of plane stress state and higher stress intensity factor at high stress amplitude, while the larger internal defects easily cause fatigue damage at low stress amplitude because the driving force for crack propagation is larger than that of the damage case from the sample surface. Generally, the fatigue lives of samples with fatigue crack initiating from the weak phase are relatively longer, about 10 times as long as those of the samples with fatigue crack starting from the sample surface. In addition, the residual fatigue crack growth life, Nf, and the initial stress intensity factor (SIF), Delta K1 at the volume defect tip exhibit a linear relation in the double logarithmic coordinate system. The present findings can provide a theoretical basis for the anti-fatigue design and fatigue life extension technology for the metallic component with welded structures.
KeywordSteel Welded joint Stress intensity factor Defect Fatigue life
Funding OrganizationChinese Academy of Sciences ; National Natural Science Foundation of China (NSFC) ; LiaoNing Revitalization Talents Program
DOI10.1016/j.ijfatigue.2021.106363
Indexed BySCI
Languageen
Funding ProjectChinese Academy of Sciences[2020SYHZ0017] ; National Natural Science Foundation of China (NSFC)[51871048] ; LiaoNing Revitalization Talents Program[XLYC1808027]
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
WOS IDWOS:000683016400001
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159588
Collection中国科学院金属研究所
Corresponding AuthorWang, Q.; Zhang, Z. F.; Li, X. W.
Affiliation1.Northeastern Univ, Sch Mat Sci & Engn, Dept Mat Phys & Chem, Wenhua Rd, Shenyang 110819, Peoples R China
2.Northeastern Univ, Sch Mat Sci & Engn, Key Lab Anisotropy & Texture Mat, Minist Educ, Wenhua Rd, Shenyang 110819, Peoples R China
3.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
4.CRRC Changchun Railway Vehicles CO LTD, 435 Qingyin Rd, Changchun 130062, Peoples R China
Recommended Citation
GB/T 7714
Wang, D. Q. Q.,Yao, D. D.,Gao, Z. B.,et al. Fatigue mechanism of medium-carbon steel welded joint: Competitive impacts of various defects[J]. INTERNATIONAL JOURNAL OF FATIGUE,2021,151:11.
APA Wang, D. Q. Q.,Yao, D. D.,Gao, Z. B.,Wang, Q.,Zhang, Z. F.,&Li, X. W..(2021).Fatigue mechanism of medium-carbon steel welded joint: Competitive impacts of various defects.INTERNATIONAL JOURNAL OF FATIGUE,151,11.
MLA Wang, D. Q. Q.,et al."Fatigue mechanism of medium-carbon steel welded joint: Competitive impacts of various defects".INTERNATIONAL JOURNAL OF FATIGUE 151(2021):11.
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