15NiCuMoNb5-6-4钢的焊后热处理与焊接接头性能研究

Research on Post-weld Heat treatment and Property of Welded Joint of 15NiCuMoNb5-6-4 Steel

对15NiCuMoNb5-6-4钢焊接接头进行不同回火参数的热处理,并对回火后焊接接头的力学性能进行了测试和分析。结果表明,提高回火温度和延长保温时间无法提高15NiCuMoNb5-6-4钢焊缝硬度,但焊缝硬度低于母材硬度时,焊接接头的拉伸强度和冲击性能指标依然可以满足设计要求。

The mechanical properties of welded joint of 15NiCuMoNb5-6-4 steel were studied.The results show that the microhardness of welding seam of 15NiCuMoNb5-6-4 steel can＇t be improved by raising tempering temperature and prolonging holding time.The tensile strength and impact property of the welded joint still meet the standard of design,although the microhardness of welding seam is less than that of the base metal.