连续激光表面重熔平面—非平面系合金的数值模拟

本文对连续激光表面重熔铝硅、铁碳合金温度场的变化，及快速凝固的微观组织形态的演绎进行了数值模拟，以期通过对这两种典型的f-nf系合金的研究，得到f-nf系合金在激光表面重熔下微观组织形态演绎的共同特征。数学模型在能量平衡方程的基础上，考虑到激光束空间Gauss分布特性，计算了物体表面温度场三维分布，在此基础上结合枝晶分布KGT模型以及共晶分布经修正的TMK模型，建立起一个完整的从激光重熔到共晶生长的计算模型。利用此模型模拟计算了f-nf合金激光重熔后，快速凝固的微观组织的共晶生长的范围。

Numerical simulation for CW laser surface remelting of f nf alloy

Three dimensional temperature filed,for CW laser surface remelting of Al Si and Fe C alloy and the eutectic coupled zone at the condition of rapid solidification,has been calculated by numerical simulation,to get the eutectic coupled zone of f nf alloy at the condition of rapid solidification through by the two kinds of typical f nf alloy,in this paper.The numerical model is based on energy balance equation,used taking into account of Gauss distribution of laser spot,and the three dimensional temperature distribution and surface temperature gradient of samples have been calculated,combining with KGT model for dendrite and modified TMK model for eutectic,the complete eutectic microstructures will be obtained.The coupled growth zones have been calculated by using this model after CW laser surface remelting of f nf alloy.