标题:Fatigue behavior improvements of laser-induction hybrid welded S690QL steel plates
作者:Li, Li ;Zheng, Jianming ;Wang, Chunming
作者机构:[Li, Li ;Wang, Chunming ] State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 更多
通讯作者:Wang, Chunming
通讯作者地址:[Wang, C] State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and TechnologyChina;
来源:Optics and Laser Technology
出版年:2020
卷:126
DOI:10.1016/j.optlastec.2020.106101
关键词:Cracks; Fatigue strength; Laser-induction hybrid welding; Single-laser welding; Transient failure mode
摘要:In this paper, the improvements of fatigue performances of S690QL steel welded by laser-induction hybrid welding (LIHW) method were performed, mainly through the infrared imaging device to obtain the weld thermal cycle, fatigue machine to test the fatigue strength and scanning electron microscope to observe the fracture morphology. In fatigue tests, tension-tension fatigue loading and stress ratio R = .0.1 was selected. The LIHW fitted S-N curves were derived. It was found that the cracks with symmetrical grooves were initiated at the weld center (WC), while the single-laser welding (SLW) fatigue samples were fractured at the WC. However, the LIHW samples were finally fractured near heat-affected zone (HAZ). The fracture morphology of fatigue samples with stress amplitude of 108 MPa and 144 MPa were further selected to analysis. Due to different degree of defects or stress concentration, and different welding heat input absorption ability and cooling rate, in sudden fracture region, SLW fatigue samples mainly contained the brittle transient failure mode, LIHW fatigue samples mainly showed a ductile failure mode. It can thus be concluded that the LIHW method could improve the fatigue performance of S690QL steel joints. © 2020 Elsevier Ltd
收录类别:EI;SCOPUS
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85078521921&doi=10.1016%2fj.optlastec.2020.106101&partnerID=40&md5=6545c2ec5c25411c8dc83e91f8814a0a
TOP