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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
In this paper, the temperature fields of Al-Si and Fe-C alloys after continuous laser surface remelting and the deduction of the rapid solidification microstructure were numerically simulated in order to obtain the f nf alloy through the study of these two typical f nf alloys The common characteristics of the microstructure evolution of the alloy under laser surface remelting. Based on the energy balance equation, taking into account the spatial Gauss distribution of the laser beam, the three-dimensional distribution of the temperature field on the surface of the object is calculated. Based on the KGT model of dendrite distribution and the modified TMK model of eutectic distribution, the mathematical model is established A complete computational model from laser remelting to eutectic growth. Using this model, the range of eutectic growth of rapidly solidified microstructures after laser remelting of f nf alloy has been simulated