选区激光熔化成形高温合金GH4169薄壁件有限元分析
Finite Element Analysis of Selective Laser Melting of GH4169 Thin-walled Parts
陈劲松 1霍振浩 1闫琦昊 1龚诚信 1黄达1
作者信息
- 1. 江苏海洋大学 机械工程学院,江苏 连云港 222005
- 折叠
摘要
基于选区激光熔化成形高温合金GH4169材料薄壁件的有限元仿真,通过对选区激光熔化成形过程中的温度场与应力场进行分析,研究了激光扫描速度、铺粉厚度对薄壁件成形效果的影响.将选区激光熔化成形薄壁件过程中的温度场与应力场结合,建立了瞬态热-静态结构耦合场,对成形薄壁件过程进行分析.结果表明,通过增大扫描速度减小能量密度,薄壁件尺寸偏差随着应力降低而变小;通过增大铺粉厚度导致温度梯度增大,薄壁件尺寸偏差随着冷却后的残余应力增大而增大,当扫描速度为1 200 mm/s、铺粉厚度为0.03 mm时打印效果最好.并通过实验验证了实际变形数据与有限元模拟方法趋势一致,有限元方法可以对实验过程进行较好模拟.
Abstract
This study employs finite element simulation to investigate the effects of laser scanning speed and powder layer thickness on the formation quality of thin-walled parts made from GH4169 material using selective laser melting(SLM).By analyzing the temperature and stress fields during the SLM process,a transient thermal-structural coupled field model was developed to assess the formation of thin-walled parts.The findings reveal that increasing the scanning speed,which reduces energy density,leads to a reduction in part dimensions and stress levels.Conversely,augmenting the powder layer thickness enhances the temperature gradient,resulting in greater size deviations and increased residual stresses upon cooling.Optimal printing outcomes were achieved at a scanning speed of 1 200 mm/s with a powder layer thickness of 0.03 mm.Ex-perimental validation confirms that the actual deformation data aligns with the trends predicted by the finite element simulation,indicating that this method provides an effective simulation of the experimental process.
关键词
高温合金GH4169/选区激光熔化成形/仿真模拟/温度场/应力场Key words
GH416/selective laser melting(SLM)forming/simulation/temperature field/stress field引用本文复制引用
出版年
2024
NETL
NSTL
万方数据