Effect of V/Fe composite interlayer on the microstructure and mechanical properties of electron beam welded joints of Ta-10W and GH3128

Abstract

Electron beam welding of Ta-10W and GH3128 superalloys without and with the addition of V/Fe composite interlayer was carried out to study the effect of the addition of V/Fe composite interlayer on the microstructure, mechanical properties and fracture characteristics of the welded joints. The results showed that both welded joints were well formed, with the addition of V/Fe composite interlayer having finer grains in each region. The fracture form of both welded joints are brittle fracture, fracture location are in the Ta-10W side. However, some ductile fracture features were present in the fracture of the added V/Fe composite interlayer. In direct electron beam welding, the Ta-10w side of the reaction layer there is a large number of Ta-Ni and other intermetallic compounds, which is the most important reason for its poor mechanical properties of the joint. the addition of V/Fe composite interlayer greatly reduces the tendency of intermetallic compound formation in the weld, changing the microstructure of the reaction layer, the tensile strength of the joint has been significantly increased, the maximum tensile strength of 362 MPa.