Abstract

The chemical composition and microstructure of an AISI 321/Cu/Ta/Ti welded joint prepared by carbon dioxide laser is studied in this work. An analysis of the chemical composition showed that the Ta plate located between the Cu plate and Ti is the barrier for melting Ti in the welding pool. The welded joint consists of the Cu-based solid solution, austenite, and (Ta,Ti)(Fe,Cr)₂ and (Ta,Ti)Сu₃ intermetallic particles 10–50 µm in size. Tantalum actively interacts with the Fe-based melt. A diffusion zone consisting of β-Ti and (Ti,Ta)₂Cu intermetallic particles forms near the boundary between the titanium alloy and the Ta plate. Joint fracture upon tensile tests occurs along the boundary between the (Fe + Cu) zone and Ta plate; the ultimate tensile strength is σ_u = 215 MPa.

中文翻译：

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AISI 321 / Cu / Ta / Ti焊接接头的化学成分和组织研究

摘要

本文研究了二氧化碳激光制备的AISI 321 / Cu / Ta / Ti焊接接头的化学成分和显微组织。化学成分分析表明，位于Cu板和Ti之间的Ta板是熔池中Ti熔化的障碍。焊接接头由Cu基固溶体，奥氏体和（钽，钛）（铁，铬）₂和（钽，钛）Сu _3个金属间化合物颗粒为10〜50μm的尺寸。钽与铁基熔体有效相互作用。在钛合金和Ta板之间的边界附近形成由β-Ti和（Ti，Ta）₂ Cu金属间化合物颗粒组成的扩散区。拉伸试验时，接头断裂沿（Fe + Cu）区和Ta板之间的边界发生。极限抗拉强度为σ_u = 215兆帕。