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利用真空扩散焊方法制备了铁中间层钛-钢扩散焊接头,并采用OM、SEM、EDS、XRD、显微硬度和拉伸试验方法,研究了铁中间层钛-钢扩散复合界面组织和性能。结果表明,在900～1050℃、30 min扩散条件下,Fe、Ti原子在界面处发生了互扩散;钛侧形成βTi+α-βTi+αTi组织,钢侧发生脱碳,铁中间层形成柱状晶组织;拉伸强度随扩散温度升高呈现先增加后减小的趋势,900℃、30 min扩散试样拉伸强度最高,达到260 MPa;拉伸断口具有粗糙断裂区、脆性断裂区及二次断裂区特征,并在断口上检测出TiC、FeTi和Fe2Ti相。
The intermetallic titanium-steel diffusion welded joints were prepared by vacuum diffusion welding. The microstructure and properties of titanium-steel diffusion composite interface were studied by OM, SEM, EDS, XRD, microhardness and tensile test . The results show that the intergranular diffusion of Fe and Ti atoms occurs at the interface of 900 ~ 1050 ℃ for 30 min, the βTi + α-βTi + αTi forms on the titanium side and decarburizes on the steel side, and the iron interlayer forms columnar The tensile strength increases with the increase of diffusion temperature first and then decreases. The tensile strength at 900 ℃ for 30 min is the highest, reaching 260 MPa. The tensile fracture has rough fracture zone, brittle fracture zone and two Sub-fault zone characteristics, and detected in the fracture TiC, FeTi and Fe2Ti phase.