【摘要】 文中对Fe-Mn-C系TWIP钢的焊接行为进行了系统研究,采用激光焊和钨极氩弧焊(TIG)进行了焊接试验,对两种焊接方法的焊后热影响区的显微组织及力学性能进行了分析.结果表明,激光焊后焊接热影响区(HAZ)及焊缝组织更为细小,分布也更为均匀,断后伸长率明显好于TIG焊.焊缝的显微硬度要高于HAZ和母材,TIG焊后HAZ晶粒严重长大,显微硬度在HAZ处也明显降低,出现了软化,导致综合性能偏差.更多还原

【Abstract】 In this paper,microstructure and mechanical properties were analyzed on the heat-affected zone(HAZ) of the sheets obtained by applying laser beam and TIG welding.The result shows that microstructure of HAZ and fusion zone(FZ) becomes finer and distributes more uniformly and the elongation is significantly better than that of TIG welding.Microhardness of FZ is larger than that of the base metal.Grains of TIG welding in HAZ grow a lot,and microhardness is significantly reduced in the HAZ which leads to worse comprehensive performance.更多还原