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
谢文浩 1李俊 1周建新 2计效园 2殷亚军 2张帅锋 3段伟 4段现银 1党理想1
作者信息
- 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. 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
- 3. 中国船舶集团有限公司第七二五研究所,洛阳 471023
- 4. 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;中国船舶集团有限公司第七二五研究所,洛阳 471023
- 折叠
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.
Abstract
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=1.5 m/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Key words
Selective Laser Melting/IN718 Alloy/Melt Pool Evolution/Numerical Simulation引用本文复制引用
基金项目
国家自然科学基金资助项目(52175359)
出版年
2024
NETL
NSTL
万方数据