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在BT20钛合金基板上进行了不同激光功率、扫描速度等工艺参数的激光沉积修复试验,研究了各工艺参数对BT20钛合金组织及显微硬度的影响规律,并分析了其成因,为优化工艺参数提高激光沉积修复质量提供依据。结果表明:随着激光功率P的增大,柱状晶的长度变短并趋向于等轴晶的转变;在相同的激光功率下,随着激光扫描速度v的增大,柱状晶的尺寸变得细长;基体、热影响区、修复区的显微硬度在修复方向逐渐增大。
The laser deposition and repair experiments of different laser power, scanning speed and other process parameters were carried out on the BT20 titanium alloy substrate. The effects of various process parameters on the microstructure and microhardness of BT20 titanium alloy were studied, and the causes were analyzed. In order to optimize the process Parameters to improve the quality of laser deposition repair basis. The results show that with the increase of laser power P, the length of the columnar crystal becomes shorter and tends to the transformation of equiaxed crystal. With the increase of the laser scanning speed v, the size of the columnar crystal becomes the same under the same laser power Slender; matrix, heat affected zone, the repair area of the microhardness in the repair direction gradually increased.