研究了0Cr13Ni7MoTi马氏体时效不锈钢在不同焊接功率下的激光熔焊组织形貌及焊后热处理对焊接接头组织、硬度分布及拉伸性能的影响.结果表明,焊接接头分为熔合区、热影响区和母材3个区域.根据不同功率的焊接接头各区域及熔合区上下部凸起尺寸特征,2000 W和2500W的激光焊接工艺较为合理.选取2500W的焊接接头在420～480℃之间分别进行2 ～3h的时效处理,420～460℃时效处理后焊接接头各区域组织与焊后组织无明显变化,经480℃时效后,在原奥氏体晶界处形成少量回复奥氏体.经过时效处理的焊接接头的硬度和屈服强度均较未处理时有所提高,经过460℃×3 h时效处理的硬度最高,达到490～500 HV,屈服强度提高了67.3％.
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