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对T250马氏体时效钢进行光纤激光焊接和时效处理,研究了焊前时效和焊后时效条件下接头的强韧性并分析了原因.结果表明,焊前时效处理接头的强韧性较差,抗拉强度为时效态母材的62%,静力韧度为28%;焊后时效处理的接头的强韧性较好,抗拉强度达到了时效态母材的98%,静力韧度达到了71%.焊缝区是影响焊接-时效处理接头强韧性的关键区域,焊缝中弥散析出的Ni3(Ti,Mo)颗粒相是焊后时效处理的接头强韧性优于焊前时效处理的接头的根本原因.Ni3(Ti,Mo)析出相对接头的抗拉强度和弹性变形阶段的静力韧度有利,对接头塑性变形阶段的静力韧度有双重影响.晶界逆转变奥氏体对接头的抗拉强度和弹性变形阶段的静力韧度影响不大,但对接头塑性变形阶段的静力韧度不利.
The T250 martensitic steel was treated by fiber laser welding and aging treatment, the toughness of pre-welded aging and post-weld aging conditions were studied and the reason was analyzed. The results show that the pre-welded aging joint has poor toughness and toughness, The tensile strength is 62% of the aging matrix and the static toughness is 28%. The toughness of the joints after aging is better, the tensile strength reaches 98% of the aging matrix and the static toughness reaches 71% .The weld zone is a key area that affects the strength and toughness of the weld-aging treatment joint. The Ni3 (Ti, Mo) phase precipitated in the weld is the joint with post-aging treatment better than the pre-weld aging . The tensile strength of Ni3 (Ti, Mo) precipitation relative to the joint and the static toughness of the elastic deformation phase are favorable, which have a dual impact on the static toughness of the plastic deformation phase of the joint. The tensile strength of the joint and the static toughness of the elastic deformation stage have little effect, but the static toughness of the plastic deformation stage of the joint is unfavorable.