【摘要】 钒基合金被认为是优良的聚变反应堆结构材料,为满足结构应用需求,提高经济性需要获得钒合金与不锈钢的双金属结构。利用高真空电子束熔钎焊连接钒合金(V-5Cr-5Ti)与抗氢不锈钢(HR-2),研究分析熔-钎焊接头的焊缝成型、微观组织与接头性能。结果表面,焊缝正面和焊缝背部成型均良好,接头结合区呈现出熔化-钎接的特点,在钒合金材料未发生熔化的前提下形成冶金结合。通过对两种金属液固反应的控制,在接头结合界面处形成了一个反应区,反应区在接头上部区域较宽,达到1 mm,底部较窄,仅为0.5 mm。在反应区内靠近钒合金一侧的金属化合物厚度与结构影响着接头的性能,在靠近钒合金一侧的界面处形成大于20μm厚的反应扩散层,在整个连接反应区内未发现金属间化合物的产生。接头的抗拉强度可以达到200MPa以上。更多还原

【Abstract】 Vanadium alloy have been identified as a leading candidate for fusion energy systems.To construct more effective and economic systems,dissimilar materials joints between vanadium alloys and stainless steel are required.The high vacuum electron beam welding-brazings(EBWB) was used to joining vanadium alloy(V-5Cr-5Ti) to stainless-steel(HR-2).The welded seam appearance and the microstructure as well as the mechanical properties of the joints were analyzed.The results show that the welded seam is good as well as the back.The joints with the characters of welding and brazing and the metallurgically bonded joint are achieved without melting the vanadium alloy sheet.Well controlling the liquid-to-solid interalloying of dissimilar materials,a reaction zone is gained on the interface.The width of reaction zone at the top of the joint is up to 1 mm,wider than the bottom of the joint(0.5 mm).The thickness and structure of the interface layer formed in the vanadium alloy side influence the joint properties.20 μm thickness interaction diffusion layer forms in the interface of V base metal and reaction zone and no interfacial intermetallic phases are detected in the joint.The maximum tensile strength of vanadium alloy/stainless-steel dissimilar alloy joints is up to 200 MPa.更多还原