【摘要】 采用数值模拟技术 ,可以使聚焦光束处理参数的优化过程更加经济、高效。在此背景下 ,本文建立了聚焦光束相变硬化过程温度场分布的三维数值分析模型。模型考虑了试样的有限尺度 ,试样材料热物理参数的温度依赖关系 ,以及对流、辐射造成的表面热损失。对尺寸为 1 2 5mm× 1 2 5mm× 90mm的 4 5钢试样的瞬态传热过程进行三维模拟 ,验证了模型的可靠性。计算得到的试样三维温度分布图像可用来预测聚焦光束处理产生的相变硬化层尺寸。结果表明 ,聚焦光束相变硬化过程温度场的空间分布是局域化的 ,并且具有极高速的加热和冷却过程。匀速扫描的聚焦光束相变硬化过程存在端部效应更多还原

【Abstract】 By applying the numerical simulation technology,it makes the optimization process for light beam heating parameters more efficient and economic.Accordingly,a model has been developed for numerical simulation on 3D transience temperature field via light beam remelt free hardening.The model is defined on the finite size.The change during the process of the thermalphysics properties of material,and the heat loss caused by convection and radiation are considered.The work piece is made of steel 45 with the size of 12 5mm×12 5mm×90mm.The reliability of the model has been testified by comparison of the simulation and the experimental results.The 3D temperature distribution can be used in forecasting the size of phase transformation zone.The temperature field distributes in a local zone and there is the end effect in the process.The heating and cooling rate are very high.The process parameter can be optimized based on the simulation.更多还原