选区激光熔化成形钛合金薄壁件热行为及打印极限高度研究  

Study on thermal behavior and printing limit height of selective laser melting forming titanium alloy thin-walled parts

作　　者：彭凯 蔡高参 胡彪 PENG Kai;CAI Gao-shen;HU Biao(School of Mechanical Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学机械工程学院,浙江杭州310018

出　　处：《塑性工程学报》2024年第7期114-123,共10页Journal of Plasticity Engineering

基　　金：浙江省自然科学基金资助项目(LQ18E050010);中国博士后基金资助项目(2018M642482);浙江理工大学青年创新专项项目(22242297-Y)。

摘　　要：为了研究钛合金薄壁件在选区激光熔化工艺下的热行为及工艺参数对打印极限高度的影响,采用理论建模、模拟仿真和正交试验法等手段开展了钛合金薄壁件在复杂热循环作用下的热行为及打印极限高度研究。分别从单层单道、单层多道和多层单道展开研究。模拟结果表明,对于单层单道成形,当激光束从节点N1移动到节点N3时,熔池峰值温度和最大冷却速率逐渐增加;对于单层多道成形,当激光束从第1道扫描至第3道时,熔池尺寸和熔池峰值温度呈递增趋势;对于多层单道成形,当激光束从第1层扫描至第5层时,熔池尺寸呈递增趋势。试验结果表明,打印极限高度与激光功率成正相关,与扫描速度呈负相关,随着扫描间距的增加先增加后减小,且与激光能量密度呈线性增长趋势。To study the thermal behavior of titanium alloy thin-walled parts under selective laser melting process and the influence of process parameters on the printing limit height,the theoretical modeling,simulation and orthogonal test method were used to study the thermal behavior and the printing limit height of titanium alloy thin-walled parts under the action of complex thermal cycle.The study was carried out from single-layer single-pass,single-layer multi-pass and multi-layer single-pass respectively.The simulation results show that for single-layer single-pass forming,when the laser beam moves from node N1 to node N3,the peak temperature of the molten pool and the maximum cooling rate increase gradually.For single-layer multi-pass forming,when the laser beam scans from the first pass to the third pass,the molten pool size and the peak temperature of the molten pool show a tendency to increase.For multi-layer single-pass forming,when the laser beam scans from the first layer to the fifth layer,the melten pool size shows an increasing trend.The test results show that the printing limit height is positively correlated with the laser power,negatively correlated with the scanning speed,first increases and then decreases with the increase of scanning spacing,and linearly increases with the laser energy density.

关 键 词：选区激光熔化 增材制造 薄壁件 热行为 打印极限高度 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]