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。

Thin wall samples from TA12 titanium alloy have been prepared on TA15 substrates by laser direct deposition of coaxially fed metallic powders under protective gas. The microstructure,phases and mechanical properties of the deposited materials were investigated. The results indicated that the deposited materials are fully dense,and metallurgically bonded with the substrate. The as-deposited TA12 titanium alloy tendes to be equiaxed grains,within which is basketweave widmannstatten structure formed of many fine α lamella and small amount of β with different direction. And the size of the original β-Ti grains increases a little with increasing the laser power used for depositing. The tensile strength at room temperature and under 550 ℃ for the as-deposited materials along the scanning direction reaches the value for the annealed bar.