对核聚变反应堆用低活化马氏体钢进行了激光焊接试验,并对焊接接头的显微组织和力学性能进行了测试分析。结果表明,对低活化马氏体钢进行激光焊接可以获得高质量的焊接接头;焊缝组织主要为板条状马氏体,硬度可达530 HV;热影响区(HAZ)包括粗晶区和细晶区,粗晶区为粗大的珠光体,细晶区为细小的珠光体和铁素体的混合组织,最低硬度为220 HV;焊接接头有很好的力学性能,抗拉强度高达775 MPa。 Laser welding experiments on low-activation martensitic steel for nuclear fusion reactors were carried out. The microstructure and mechanical properties of the welded joints were tested and analyzed. The results show that high quality welded joints can be obtained by laser welding of low activation martensitic steel. The weld microstructure is mainly lath martensite with a hardness up to 530 HV. The heat affected zone (HAZ) Fine grain area, coarse grain area coarse pearlite, fine grain area for the fine pearlite and ferrite mixed organization, the minimum hardness of 220 HV; welded joints have good mechanical properties, tensile strength up to 775 MPa .