对CLAM钢进行电子束焊接后,对接头部位进行回火和调质处理,利用扫描电子显微镜和透射电子显微镜观察热处理前后的焊缝组织,同时对焊缝进行室温冲击实验。结果表明,电子束焊接后,CLAM钢焊态焊缝的微观组织主要有δ铁素体和板条马氏体,冲击韧度较低。经回火处理后,板条马氏体转化为回火马氏体,δ铁素体被保留。经调质处理后δ铁素体完全消失,冲击韧度得到改善。 After the electron beam welding of CLAM steel, the joints were tempered and quenched. The weld microstructures before and after heat treatment were observed by scanning electron microscopy and transmission electron microscopy. At the same time, the weld experiments were carried out at room temperature. The results show that the microstructure of weld metal of CLAM steel is mainly composed of δ-ferrite and lath martensite after e-beam welding, and the impact toughness is low. After tempering, lath martensite transformed into tempered martensite, δ ferrite is retained. After quenched and tempered, the δ-ferrite disappeared completely and the impact toughness was improved.