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 experiment was done on the reduced activation martensitc steel which is used in fusion reactor,the microstructure and mechanical properties of the welding joint were tested in this paper. The results show that the joints with good quality can be obtained by laser welding. The microstructure in weld is lath martensite,while the heat affect zone (HAZ) comprised coarse grain zone and fine grain zone. The structure of coarse grain zone is coarse pearlite and a mixed structure which comprises fine pearlite and ferrite in fine grain zone. The hardness of the weld was about 530 HV,while minimum hardness was about 220 HV in HAZ. The tensile strength of the weld joint reached 775 MPa.