Experimental and Numerical Study on Local and Overall Mechanical Properties of Laser Welded DP980 Steels
Ferrite-martensite dual-phase (DP) steel is one of the advanced high strength steel (AHSS) families widely adopted for body-in-white.The characterization of local microstructure and mechanical properties is of vital importance to evaluate and model the overall behavior of the welded DP steel.In this work,hot dip galvanized DP980 steel was welded using Nd:YAG laser with high heat input (HHI) and low heat input (LHI).The thermal cycles experienced locally were identified using finite element analysis of the laser welding process.The local thermal cycles of LHI and HHI are shown in Fig.1a and b based on numerical simulation.The t8/5 time,which represents the cooling time from 800℃ to 500℃,is important to evaluate the cooling rate of the welding thermal cycle.The average t8/5 of simulated welding was approximately 0.62s for LHI,while the t8/5 of HHI was approximately 4.35s.
laser welding dual-phase steel heat-affected zone finite element analysis thermal simulation mechanical properties
JIA Qiang GUO Wei PENG Peng ZHU Ying ZOU Guisheng
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China; Internat Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
国际会议
成都
英文
752-754
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）