针对TA15钛合金通槽损伤形式进行激光沉积修复试验, 观察修复试样的组织形貌, 测试修复试样的显微硬度及冲击性能。实验结果表明, 修复试样由修复区、热影响区及基材区三部分组成, 修复区与基体形成致密冶金结合; 修复区组织为粗大原始β柱状晶, 晶内为α＋β网篮组织, α片层随机取向生长, 宽为0.4～0.5 μm。硬度分布由基材向修复区依次提高, 主要合金合金元素Al、Zr、Mo、V由基材到激光修复区均匀分布, 无宏观偏析。修复试样的冲击韧性较基材低, 为基材的52%～73%; 在高应力冲击载荷下, 修复区呈脆性断裂, 基材倾向于韧性断裂; 修复试样的冲击韧性随修复区体积增加而提高。

Researches on the laser deposition repair of TA15 titanium alloy forgings having groove damage are carried on, and the microstructure of laser deposition repair sample is analyzed, then the microhardness and impact toughness of the laser deposition repair samples are tested. The results indicate that there is a dense metallurgical bond between the repaired zone and the substrate, and the laser repair sample includes repaired zone, heat affected zone and substrate. The macrostructure of the repaired zone is characterized by the epitaxial coarser columnar β with basket weave α/β, and the microstructure of the repaired zone is characterized by a fine α/β lamellar microstructure with various random orientations, and the width of the α is 0.4～0.5 μm.Distribution of micro-hardness from the substrate to the repaired zone shows an increasing trend. The Al,Zr,Mo,V elements are uniformly distributed without fluctuation and segregation from the substrate to the repaired zone. The impact toughness of laser deposition repair component is alittle lower than that of the substrate, which is about 52%～73% of the substrate; Under the high stress impact load, the damage of the repaired zone is brittle fracture, and the damage of the substrate tends to ductile fracture; The impact toughness of laser deposition repair component is improved with the repaired zone volume increasing.