板坯内部裂纹质量损失因子的理论研究

Theoretical Study on Quality Loss Factors for Internal Crack of Slab

针对板坯内部裂纹质量缺陷的在线理论诊断分析,基于板坯连铸冶金限制准则的全面考虑,从传热状态、力学行为和钢种特性等多方面着眼,在数学模型中引入了多个重要的质量损失因子用以计算相应的裂纹生成指数,并结合板坯连铸生产的冶金特点、通过深入的理论研究获得了相关损失因子的数值计算方法及其对质量缺陷的影响效果,为板坯质量诊断模型的开发提供了必要的理论支持,具有良好的理论意义和应用价值。

According to the online theoretical diagnosis and analysis about internal crack of slab, several important quality loss factors have been introduced into the mathematical model to calculate the relevant crack formation index, based on full consideration on the metallurgical restriction rules of slab continuous casting, and in terms of the heat-transfer status, mechanical behavior and steel grade property. Combined with the metallurgical characteristic of slab continuous casting process, both the numerical calculation method of the loss factors and their effects on quality defect have been obtained through the in-depth theoretical study, which have provided the necessary principle fundamental for development of the slab quality diagnosis model, and have good theoretical meaning and practical value.