TA15钛合金激光沉积温度场数值模拟与检测

Measurement and numerical simulation of temperature field of laser deposition of TA15titanium alloy

在综合考虑热源模型、对流辐射换热、相变潜热、材料非线性因素对激光沉积修复温度场影响前提下,建立了激光沉积修复的数学模型,采用有限元参数化设计语言(APDL)对多道多层激光沉积修复温度场进行了数值模拟。研究了激光沉积修复瞬时温度场及其中心高度上节点温度随时间变化情况,分析了修复件中心高度上温度梯度分布情况。搭建了激光沉积修复温度测量系统,对修复时表面温度进行了测量,并与模拟温度进行了比较,两者吻合较好。为控制激光沉积修复组织、提高修复质量提供有效手段。

The finite element model is built for laser deposition repair process based on comprehensive consideration of the heat source model,heat transfer of convection and radiation,phase change latent heat and nonlinear factors of material.Then a numerical simulation of temperature field of multi-pass and multi-layer laser deposition repair is conducted using ANSYS parametric design language.The distribution of transient temperature field are studied at different time,and change of temperature and the distribution of temperature gradient of different nodes along center height of the repaired parts are analyzed.A temperature measurement system of laser deposition repair is established to test surface temperature of the repaired parts,and a good agreement is observed between the calculated temperature and the experimental results.It is found that thermal simulation of laser deposition repair is an effective way to control the microstructure of laser deposition repaired parts and improve the quality of repair.