应用激光, 2018, 38 (2): 183, 网络出版: 2018-06-01
选区激光熔化钛合金成形工艺和表面形貌研究
Study on Forming Process and Surface Topography of Titanium Alloy by Selective Laser Melting Process
选区激光熔化 钛合金 表面形貌 能量密度 鱼鳞纹 selective laser melting titanium alloy surface topography energy density fish-scale pattern
摘要
针对TC4钛合金材料进行选区激光熔化单道扫描和多道搭接工艺实验。通过改变激光功率和扫描速度来探究工艺参数对TC4成形效果和表面形貌的影响机理。对实验中出现的断续、球化、鱼鳞纹和“爆粉”等现象进行分析和优化。结果表明, 激光功率和扫描速度对熔道宽度和高度有较大影响, 选择合适的工艺参数窗口才能得到连续干净的熔道。熔池的对流运动会导致鱼鳞纹状凝固痕迹, 且随着扫描速度增加, 鱼鳞纹由圆润变得尖细。能量密度对多道搭接成形表面球化颗粒有较大影响。能量密度过大会导致“爆粉”现象, 可以通过降低激光功率或提高扫描速度来预防。
Abstract
The single pass scanning and multi-pass cladding experiments have been carried out for TC4 titanium alloy materials by selective laser melting. By changing the laser power and scanning speed, the influence of process parameters on the forming effect and surface topography of TC4 is investigated. The phenomena of discontinuous tracks, balling, fish-scale patterns and "powder explosion" are analyzed and optimized. The results show that the laser power and scanning speed have a great influence on molten track width and height, the continuous and clean molten track can be obtained only by choosing the appropriate process parameter window. The convection motion in molten pool will lead to fish-scale patterns, and with the increase of scanning speed, the patterns become more narrow and thin. The energy density has a great influence on the spheroidized particles on the multi-pass cladding forming surface. Excessive energy density leads to "powder explosion" phenomena, which can be prevented by decreasing the laser power or increasing the scanning speed.
宦君, 田宗军, 梁绘昕, 谢德巧, 沈理达, 吕非. 选区激光熔化钛合金成形工艺和表面形貌研究[J]. 应用激光, 2018, 38(2): 183. Huan Jun, Tian Zongjun, Liang Huixin, Xie Deqiao, Shen Lida, Lv Fei. Study on Forming Process and Surface Topography of Titanium Alloy by Selective Laser Melting Process[J]. APPLIED LASER, 2018, 38(2): 183.