对新型铸造模具钢进行焊接修复,研究焊后热处理对焊接接头组织和性能的影响。结果表明,焊后回火处理使模具钢完全淬火区组织由淬火马氏体转变成回火马氏体,不完全淬火区和回火区组织变化不明显。回火处理后淬火区和焊缝硬度明显降低,焊接接头抗拉强度增加。焊后回火处理对焊缝磨损率和平均摩擦系数影响不大。 The new casting mold steel welding repair, welding heat treatment after welding on the joint organization and performance. The results show that the microstructure of quenched martensite transformed into tempered martensite by the tempering after welding is completely quenched, and the microstructure of quenched and tempered zone is not obvious. After tempering quenching zone and weld hardness was significantly reduced, the tensile strength of welded joints increased. Post-weld tempering on the weld wear rate and the average friction coefficient has little effect.