40Cr钢平板表面激光堆焊三维温度场数值模拟

Numerical simulation of three-dimensional temperature field on plate surface of 40Cr steel in laser surfacing process

基于ANSYS数值模拟平台,建立了三维瞬态激光堆焊40Cr钢温度场有限元模型,利用APDL参数设计语言实现热源的移动,对40Cr钢表面激光相变硬化处理过程的温度场进行模拟,得出熔池温度随时间的变化规律,并对比了不同功率和不同扫描速度对温度场的影响。结果表明:随热源的移动,温度场呈现彗星状云图,且激光光斑前缘温度梯度大,后部温度梯度小;不同功率对比结果表明,在相同的激光扫描速度6 mm/s时,表面温度最大值随激光功率增大而升高,在900 W时达到4238℃;不同速度对比结果表明,在相同功率800 W时,表面温度最大值随激光速度增大而减小,在6 mm/s时达到3738℃。

Based on a numerical simulation platform ANSYS,a finite element model of three-dimensional transient laser surfacing temperature field of 40Cr steel was build,and heat source movement was realized using APDL parameter design language.The temperature field on 40Cr steel surface in laser hardening process was simulated,the molten bath temperature change law with time was deduced,and the influence of laser power and scanning speed on temperature field was compared.The results show that the temperature field shows contour map like Comet during the heat source movement,and there exist large temperature gradient in the front of laser spot and small temperature gradient at the back of it.The maximum surface temperature increases with the increase of laser power,and it reaches 4238 ℃ when laser power is 900 W and scanning speed is 6 mm/s;The maximum surface temperature increases with the decrease of laser scanning speed,and it reaches 3738 ℃ when scanning speed is 6 mm/s and laser power is 800 W.