Microstructure and Tensile Properties of the Laser Welded TWIP Steel and the Deformation Behavior of the Fusion Zone
Microstructure and tensile properties of the laser welded joint of Fe-18.8Mn-0.6C TWIP steel were investigated in this research.Microstructures of the fusion zone (FZ) was characterized by means of X-ray diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM) combined with carbon extraction replicas technology.The welded joint with a fully austenitic structure was obtained by the CW CO2 laser.Granular divorced eutectic phases (Fe,Mn)3C and inclusions formed in the interdendritic regions due to the metallurgical reaction during the solidification of FZ.Although the mechanical properties of the welded samples are lower than those of BM,the FZ exhibited a good combination of strength (e.g.tensile strength up to 1000 MPa) and ductility (e.g.total elongation up to 73%).The microstructural evolution revealed that dislocation slip was the main deformation mechanism at low strains of FZ,while at relatively high strains,mechanical twinning was the domain deformation mechanism and played an important role in improving the strength and ductility as well as the work-hardening effect of FZ.
laser welding microsegregation shrinkage porosities mechanical twins microstructural evolution
WANG Tao ZHANG Mei XIONG Wei LIU Rendong SHI Wen LI Lin
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China Technique Center of Ansteel, Ansteel Group Corporation,Anshan 114001, Liaoning, China
国际会议
成都
英文
144-148
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）