激光选区熔化IN718合金的熔池演化过程数值模拟  

Numerical Simulation of Melt Pool Evolution in Selective Laser Melting of IN718 Alloy

作　　者：谢文浩 李俊 周建新[3] 计效园[3] 殷亚军[3] 张帅锋 段伟 段现银 党理想 Xie Wenhao;Li Jun;Zhou Jianxin;Ji Xiaoyuan;Yin Yajun;Zhang Shuaifeng;Duan Wei;Duan Xianyin;DangLixiang(Key Laboratory of Metallurgical Equipment and Control Technology,Minstry of Education,Wuhan University of Science and Technology,Wuhan 430081;Luoyang Ship Material Research Institute,Luoyang 471023;State Key Laboratory of Materials Processing and Die&.Mould Technology,Huazhong University of Science&Technology,Wuhan 430074)

机构地区：[1]武汉科技大学冶金装备及其控制教育部重点实验室,武汉430081 [2]中国船舶集团有限公司第七二五研究所,洛阳471023 [3]华中科技大学材料成形与模具技术全国重点实验室,武汉430074

出　　处：《特种铸造及有色合金》2024年第4期490-495,共6页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52175359)。

摘　　要：采用离散元(DEM)与流体体积(VOF)相结合的方法,以IN718粉末的激光选区熔化(SLM)过程为研究对象,通过数值模拟和试验验证,研究了激光功率对熔池尺寸的影响,以及熔池演化和熔道形貌的形成机理。结果表明,随着激光功率增大,熔池尺寸逐渐增大,熔池连续性和尺寸均匀性增强,合适的工艺参数(P=200 W,v=1.5 m/s)会获得最佳熔道形貌;由温度梯度引起的表面张力梯度与蒸气反冲压力共同驱动了熔池的演化和熔道形貌的形成;优化层间旋转角(θ=67°)能够降低熔道两端孔缺陷出现的概率。Utilizing a combined discrete element method(DEM)and volume of fluid(VOF)approach,effects of laser power on the melt pool size and formation mechanisms of evolution and morphology of IN718 during selective laser melting(SLM)were investigated through numerical simulation and experimental validation.The results reveal that with an increase in laser power,the melt pool size is gradually enlarged and the continuity and size uniformity of the melt pool is improved.Optimal melt track morphology is achieved at specific process parameters(P=200 W,v=1.5m/s).The surface tension gradient induced by the temperature gradient,coupled with the vapor recoil pressure,jointly drive the evolution of the melt pool and the formation of the melt track.Optimizing the interlayer rotation angle(θ=67°)can reduce the probability of pore defects at the ends of the melt tracks.

关 键 词：激光选区熔化 IN718合金 熔池演化 数值模拟 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论] TG146.15[自动化与计算机技术—计算机科学与技术]