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激光强度空间分布是影响脉冲激光相变硬化效果的重要因素。现有的二维点阵光束按强度均匀分布设计,不能完全满足应用要求。为此提出基于有限元(FE)分析的光强空间分布逆向设计思路,并给出了实现方法。建立脉冲激光相变硬化有限元模型,考虑了材料热物性参数随温度的变化和相变过程,并用实验进行校核。研究了二维点阵分布参数对温度场的影响,从目标温度场和硬化层形貌出发对二维点阵的分布参数进行调整,获得优化的强度空间分布。针对汽车冲压模具表面强化的工艺要求,应用此方法设计出具有实用价值的激光强度空间分布。
The spatial distribution of laser intensity is an important factor affecting the effect of pulsed laser transformation hardening. The existing two-dimensional lattice beam intensity distribution of uniform design, can not fully meet the application requirements. For this reason, the idea of reverse design of light intensity distribution based on finite element (FE) analysis is proposed and the realization method is given. The finite element model of pulsed laser phase transformation hardening was established. The thermophysical parameters of the material were taken into account with the change of temperature and the phase change process. The experimental verification was carried out. The influence of two-dimensional lattice parameters on the temperature field is studied. The distribution parameters of the two-dimensional lattice are adjusted from the target temperature field and the morphology of the hardened layer, and the optimized intensity distribution is obtained. Aiming at the process requirements of automobile stamping mold surface strengthening, this method is used to design a laser intensity spatial distribution with practical value.