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在保护气氛下,通过激光熔化同轴输送的TA12钛合金粉末,在TA15钛合金基体上逐层沉积制备出TA12钛合金薄壁样,分析了所沉积材料的微观组织、相组成及力学性能。结果表明,激光熔化沉积的TA12钛合金的内部组织致密,沉积材料与基体为完全冶金结合;激光熔化沉积TA12钛合金为等轴晶组织,晶粒内部为不同取向的细小片层α相与少量β相组成的网篮状魏氏组织,随着激光功率的增加,原始β-Ti晶粒的尺寸稍许增大;沉积状态下沿激光扫描运动方向室温及550℃高温下的拉伸强度均达到了退火棒材的要求。
The TA12 titanium alloy thin wall samples were deposited layer by layer on the TA15 titanium alloy substrate by laser melting TA12 titanium alloy powder under the protective atmosphere. The microstructure, phase composition and mechanical properties of the deposited materials were analyzed. The results show that the internal structure of TA12 titanium alloy melted by laser melting is dense and the deposited material is completely metallurgical bond with the substrate. TA12 titanium alloy is equiaxed by laser melting and the α phase and small amount β phase. With the increase of laser power, the size of the original β-Ti grains slightly increased. The tensile strength of the original β-Ti grains at room temperature in the laser scanning direction and the high temperature of 550 ℃ The requirements for annealing bars.