TC4钛合金多层激光熔覆工艺研究

Study on Multilayer Laser Cladding Process of TC4 Titanium Alloy

为探究TC4(Ti-6Al-4V)钛合金多层激光熔覆实验的最佳的工艺参数组合,采用IPG光纤激光器和侧向送粉系统,在TC4板材表面进行激光多层熔覆实验,熔覆粉末选择Ni60A自熔性合金粉末。实验结果显示,熔覆层各层选择的扫描速度偏低时,随着层数的增加,熔覆层表面出现过烧现象;每层之间要不断调整激光功率和扫描速度,才能得到完好的多层堆积层,且熔覆层和基体形成了良好的冶金结合。随着层数的增加,已完成的熔覆层由于受到激光热量的回火处理,表面硬度会有一定程度的降低。越靠近基体的熔覆层硬度越小,最顶部的熔覆层硬度最高。

In order to explore the optimum process parameters of TC4 （Ti-6Al-4V ）titanium alloy multilayer laser cladding experiment, laser cladding experiment is carried on the surface of TC4 board with IPG fiber laser and lateral feed system, and the cladding powder is Ni60A self fluxing alloy powder. Experimental results show that when the scanning speed of each layer is low, the surface of the cladding layer will be burn with the increase of layers. If it wants to get a good cladding layer, it should adjust the laser power and scanning speed each layer. Because of the cladding layer has been completed heated treat by laser, so the surface hardness can be reduced to a certain extent with the increase in the number of layers. The lower the hardness of the cladding layer is and the closer it nears the substrate. So the hardness of the top cladding layer is the hardest.