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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0.4~0.5μm。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。
TA15 titanium alloy through the groove damage forms of laser deposition repair test, observe the repair of the sample morphology, test the hardness of the sample and test the impact resistance. The experimental results show that the repaired sample consists of three parts: the repair zone, the heat affected zone and the substrate zone. The repair zone has a dense metallurgical bond with the matrix. The repair zone is composed of coarse primary β-columnar crystals with α + β baskets , α sheet randomly grown growth, width of 0.4 ~ 0.5μm. Hardness distribution increased from the substrate to the repair area in turn, the main alloy alloy elements Al, Zr, Mo, V from the substrate to the laser repair zone uniform distribution, no macroscopic segregation. The impact toughness of the repaired sample is lower than that of the substrate, which is 52% ~ 73% of the substrate. Under the high stress impact load, the repaired area is brittle and the substrate tends to be ductile; the impact toughness of the repaired sample Increase in volume and increase.