Ta1与0Cr18Ni9薄板的储能焊试验

采用电容储能焊方法对Ta1与0Cr18Ni9薄板进行点焊连接，分析了直接点焊与添加高熵中间层的钽/钢接头组织与性能. 结果表明，溶质截流效应可有效抑制快速凝固熔核中脆性金属间化合物产生，实现钽/钢的储能焊接. Ta1/0Cr18Ni9的直接点焊接头中熔化区集中于钢板一侧，呈双曲回转形，熔核中心出现一直径约0.2 mm近圆形气孔，在钽与钢的结合界面处有少量Fe₅Ta₃与Cr₂Ta金属间化合物产生；添加高熵合金中间层的点焊接头，由比较规则的近半扁球状熔核及熔核向基体过渡的熔合区组成，熔核具有简单固溶体结构，组织均匀致密，主要由柱状晶组成. 在相同的参数条件下，钽/钢直接焊接头接头抗剪强度为239 MPa，添加高熵合金中间层的钽/钢接头抗剪强度可达374 MPa.

Capacitor discharge welding of Ta1 and 0Cr18Ni9 thin plates

Capacitor discharge spot welding with rapid solidification characteristics of Ta1 and 0Cr18Ni9 thin plates were carried in present paper. The microstructure and properties of the welding joints between by direct CDW and adding Fe₅Co₂₄Ni₂₇Cu₂₅Cr₁₉ interlayer alloy were analysed and discussed. The results show that the solute trapping can effectively inhibit brittle intermetallic compounds to realize welding tantalum and steel welding. The welding joints of the direct CDW possess hyperbolical and gyro shaped and the melting zone is located in one side of the 0Cr18Ni9 plate. Nuggets appear about 0.2 mm subcircular porosity in diameter, and Fe₅Ta₃ and Cr₂Ta intermetallic compounds are produced at the interface between tantalum and steel. The welding joint added high entropy interlayer alloy is composed of cap-shaped nugget and fusion area of the transition base metal. Furthermore, the nugget have simple solid solution structure and fine microstructure which consisted of columnar crystals. Under the same condition, shear strength of the joint is 239 MPa by direct spot welding of Ta1 and 0Cr18Ni9 and the higher shear strength of Ta1/0Cr18Ni9 spot welding joint by CDW reached 374 MPa.