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采用实验研究的方法,探究了高功率激光成形Ti-6Al-4V合金组织演化规律和力学性能。研究结果表明:高功率激光成形Ti-6AL-4V合金的组织由贯穿多个熔覆层呈外延生长的柱状晶组成,层高熔覆约为0.8mm,β柱状晶间有等轴晶过渡,且存在明显的层带现象。原始β晶粒内部由板条α相和板条间β相组成,晶间β相内分布有针状次生α相,晶粒间与晶粒内部并无明显的成分偏析。和低功率激光成形相比,高功率激光成形Ti-6Al-4V合金硬度和强度均较低,而后者强度高于锻件标准,表现出低强高塑特点。
Using experimental methods, the microstructure evolution and mechanical properties of Ti-6Al-4V alloy with high power laser were investigated. The results show that the microstructure of high-power laser-formed Ti-6AL-4V alloy consists of columnar crystals grown epitaxially through multiple cladding layers with a high cladding layer of about 0.8mm and an equiaxed crystal transition between the β columnar grains. And there is a clear banding phenomenon. The original β grains are composed of the lath α phase and interlattice β phase, and the needle-like secondary α phase is distributed in the interphase β phase. There is no obvious component segregation between the intergranular and intragranular grains. Compared with low-power laser forming, high-power laser forming Ti-6Al-4V alloy hardness and strength are lower, while the latter is higher than the forging strength of the standard, showing low-strength plastic characteristics.