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以铸坯表层原奥氏体晶粒尺寸理论计算为基础,建立了连铸坯表层奥氏体晶粒尺寸计算模型,用面向对象的Visual Basic 6.0高级语言,开发了相应的计算机计算软件。该软件具有较好的准确性、实用性、通用性和易操作性,其仿真结果能较好地指导现场工作和实验室研究。通过仿真计算可以得出钢中碳质量分数为0.15%～0.18%时铸坯表层奥氏体晶粒尺寸较大,特别是碳质量分数0.17%时,原奥氏体晶粒尺寸最大。还可以得到结晶器冷却速度与表层原奥氏体晶粒尺寸的定量关系,随冷却速度的增大,铸坯表层原奥氏体晶粒尺寸呈指数的衰减关系。
Based on the theoretical calculation of the original austenite grain size on the slab surface, a model for calculating the grain size of the surface austenite in the slab was established. The corresponding computer calculation software was developed by using the object-oriented Visual Basic 6.0 high-level language. The software has good accuracy, practicability, versatility and ease of operation, and its simulation results can better guide the field work and laboratory research. Through the simulation calculation, it can be concluded that the austenite grain size of the slab is larger when the mass fraction of carbon in the steel is 0.15% ~ 0.18%, especially the maximum austenite grain size when the mass fraction of carbon is 0.17%. The relationship between the cooling rate of the mold and the original austenite grain size can also be obtained. With the increase of the cooling rate, the former austenite grain size decays exponentially.