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EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF LASER WELDED DP780 STEEL JOINTS
Alternative TitleEFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF LASER WELDED DP780 STEEL JOINTS
Dong Danyang1; Liu Yang2; Wang Lei2; Yang Yuling1; Li Jinfeng1; Jin Mengmeng1
2013
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume49Issue:12Pages:1493-1500
AbstractDual phase (DP) steels have good combinations of strength and ductility, and are being increasingly used in vehicle body structures to meet enhanced government regulations and safety standards. The use of DP steels in automotive industries involves laser welding, which would lead to changes in local material properties and create potential safety and reliability issues under dynamic loads. The present work aimed to study the effects of strain rate on tensile properties and deformation behavior of laser welded DP780 steel joints. The results showed that the deformation behavior of laser welded joints was more sensitive to strain rate as compared to base metal of DP780 steel. The strength of DP780 steel joint increased with increasing strain rate, while the ductility decreased first with increasing strain rate from 10(-3) to 10(1) s(-1), and then increased up to a strain rate of 10(2) s(-1). The strain rate sensitivity of the deformation behavior of DP780 steel joints was mainly dependent on the change of deformation behavior and its mechanisms of base metal at various strain rates. The distance of the tensile failure location from the weld centerline decreased obviously with the increase of strain rate. And the failure location changed from the base metal to the softened heat-affected zone (HAZ) as strain rate increased. The mechanism for changing failure location can be related to the strain rate dependence of the plastic deformation behaviors of microstructures in various regions across a joint.
KeywordDUAL-PHASE STEELS HIGH-STRENGTH PLASTIC-DEFORMATION FATIGUE PROPERTIES TENSILE BEHAVIOR MICROSTRUCTURE PREDICTION ENERGY ALLOY DP980 laser welding dual phase steel dynamic load strain rate deformation behavior
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Specialized Research Fund for the Doctoral Program of Higher Education of China] ; [Fundamental Research Funds for the Central Universities of China]
CSCD IDCSCD:5025720
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/146091
Collection中国科学院金属研究所
Affiliation1.东北大学
2.中国科学院金属研究所
Recommended Citation
GB/T 7714
Dong Danyang,Liu Yang,Wang Lei,et al. EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF LASER WELDED DP780 STEEL JOINTS[J]. ACTA METALLURGICA SINICA,2013,49(12):1493-1500.
APA Dong Danyang,Liu Yang,Wang Lei,Yang Yuling,Li Jinfeng,&Jin Mengmeng.(2013).EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF LASER WELDED DP780 STEEL JOINTS.ACTA METALLURGICA SINICA,49(12),1493-1500.
MLA Dong Danyang,et al."EFFECT OF STRAIN RATE ON DYNAMIC DEFORMATION BEHAVIOR OF LASER WELDED DP780 STEEL JOINTS".ACTA METALLURGICA SINICA 49.12(2013):1493-1500.
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