碳鋼連鑄凝固過程的微觀模擬

Simulation on the microstructure and microsegregation of carbon steel during continuous casting process

摘要: 通過一種簡單的數學模型研究了連鑄坯凝固過程中枝晶生長的重要微觀結構參數.結合中碳鋼連鑄性能計算出凝固過程中枝晶生長的尖端半徑、枝晶生長速率、二次枝晶臂間距等枝晶相關參數,并研究了拉速對上述微觀結構參數的影響.分析了碳、硅、錳、磷和硫等重要元素的微觀偏析程度隨凝固進程與坯殼生長的變化規律.與前人經驗模型的對比與驗證表明本文模型預測結果合理.

Abstract: A numerical method was used to analyze and calculate important microstructural parameters in dendrite growth under different continuous casting conditions.The dendrite tip radius,dendrite growth velocity,and dendrite arm spacing were investigated and the effects of casting speed on these parameters were studied in combination with continuous casting properties of medium carbon steel.C,Si,Mn,P and S microsegregation in the steel was discussed.The validation of this model shows good and reasonable agreements with previous models.