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采用高真空电子束阻隔熔化连接异种金属V-5Cr-5Ti钒合金和HR-2不锈钢,通过焊缝成型、微观组织和接头性能的对比分析,研究不同镀层金属(Au、Ag、Cr和Ni)的影响。结果表明:通过电子束流的偏移均可实现V-5Cr-5Ti/Au(Ag、Cr、Ni)/HR-2异种金属的连接,接头平滑过渡,焊缝正反面成型良好;V-5Cr-5Ti与熔化区的界面较为平直,在靠近钒合金一侧形成一个明显的镀层金属富集带;熔化区内部晶粒细小均匀,在靠近HR-2处形成取向明显的树枝晶。Au和Ag起到了很好的阻隔作用,V-5Cr-5Ti/HR-2接头的抗拉强度明显增加,达到400 MPa,X射线探伤未发现裂纹和气孔缺陷;镀层金属为Cr、Ni时,接头抗拉强度低于100 MPa。
Different coating metals (Au, Ag, Cr and Ni) were studied by means of high-vacuum electron beam barrier fusion melting of dissimilar metals V-5Cr-5Ti vanadium alloy and HR-2 stainless steel through the comparative analysis of weld formation, microstructure and joint properties. Impact. The results show that the connection of V-5Cr-5Ti / Au (Ag, Cr, Ni) / HR-2 dissimilar metals can be achieved by the electron beam flux migration, The interface between -5Ti and the melt zone is relatively flat, forming a distinct metal-rich zone close to the vanadium alloy. The grains in the melt zone are fine and uniform, forming dendrites with obvious orientation near HR-2. The tensile strength of V-5Cr-5Ti / HR-2 joint increased obviously to 400 MPa, no cracks and pores were found in X-ray inspection. When the coating metal was Cr and Ni, Joint tensile strength is less than 100 MPa.