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在前期焊接试验参数优化基础上,通过自行研制的线性摩擦焊机焊接了两组TC4钛合金试件,其中对一组试件焊后进行630℃×3h的热处理,然后对焊态和热处理态焊接接头的组织和力学性能进行了对比分析。结果表明,焊态下接头组织更为细小;热处理态接头组织中析出了次生α相,且晶粒发生球化长大现象,接头组织更加均匀。对两种接头在室温和400℃条件下进行拉伸试验,接头拉伸断裂位置均在母材处,且室温拉伸条件下热处理接头的抗拉强度和屈服强度均较焊态接头的高,高温拉伸条件下两种接头拉伸性能相差不大。400℃、570 MPa条件下两种接头的持久时间均超过100 h。
Based on the optimization of pre-welding parameters, two sets of TC4 titanium alloy specimens were welded by a self-developed linear friction welding machine. One group of specimens were heat treated at 630 ℃ for 3 hours after welding, and then welded and heat treated Welding joint organization and mechanical properties of a comparative analysis. The results show that the microstructure of welded joint is more finer; the secondary α phase precipitates in the welded joint and the spheroidization and growth of the grains occur, and the joint structure is more uniform. Tensile tests were carried out on the two kinds of joints at room temperature and 400 ℃. The tensile fracture position of the joint was all at the base metal. The tensile strength and yield strength of the joint under heat treatment at room temperature were higher than that of the welded joint, Tensile properties of the two joints under high temperature tensile conditions are similar. The lasting time of both joints at 400 ℃ and 570 MPa both exceeded 100 h.