Simulation of NbN precipitation during Fe-C alloy solidification
Based on the principles of metal solidification and cellular automata( CA) , a cross-scale coupling model and algorithm of the steel solidification process between columnar crystal growth and inclusions have been proposed and compared with the Lipton-Glicksman-Kurz(LGK) solution for verification. Besides, the columnar crystal growth and NbN precipitation during the solidification of Fe-C-Nb-N alloy have been simulated using the CA coupling model. The results show that the cross-scale CA coupling model can accurately simulate the columnar crystal growth and inclusion precipitation process of the Fe-C-Nb-N system. In the simulated columnar crystal growth process, the dendrite competition growth is obvious, and secondary dendrite growth exists when the solid phase ratio reaches 0.53, and NbN starts to precipitate when the solid phase ratio reaches 0. 71. In the NbN precipitation process, NbN is in the shape of dotted spheres or irregular shapes and the particle size is 0.3～2.8 μm, which is in good agreement with the experimental results.
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维普
