激光熔化热处理的理论及实验研究

The Experiment Verification of Laseer Melt Flow and Temperature Field Simulation

对于现有的激光运用中 ,表面熔化已经成为了激光表面改性的一种重要手段。为了充分了解激光熔化机理 ,对表面熔化进行模拟研究很有必要。本文运用导出的内部边界条件的解析模型 ,利用有限元方法 ,对激光热处理温度场的偏微分方程进行了数值模拟。预测的最大熔化区域和实验比较取得了很好的一致。

TO a11 the available laser applications,surface melting hasturned out to be a powerful technique for improves the surface mechanical properties.In order to understand the laser melting process,investigations into modelling of heating mechanism initiating the laser melting are necessary.In the present study,the internal boundary conditions 〔5〕 of calculated domain are derived by use of an analyticai model,and it is used to get the numerical solution of partial differential equation (PDEs) of laser material treatment temperature field simulation by FEM.Maximum melt width and depth are predicted through three-dimension temperature field,which are compared with experimental results.It is found that the HAZ predicted from theory are in agreement with the experimental results.