板坯连铸结晶器内钢凝固过程热行为研究 Ⅱ.模型验证与结果分析

SIMULATION OF THERMAL BEHAVIOR DURING STEEL SOLIDIFICATION IN SLAB CONTINUOUS CASTING MOLD Ⅱ.Model Verification and Results Analysis

基于建立的二维瞬态热/力耦合有限元模型,模拟计算了国内某钢厂实际板坯连铸工况下结晶器内某高强船板钢凝固过程的热行为,并利用现场实测温度数据验证了模型的可靠性.在此基础上重点研究分析了该钢在结晶器凝固过程角部区域气隙厚度、坯壳-铜板间的保护渣(包括液渣层和固渣层)分布及其热行为变化规律和对应区域的热流与表面温度变化特征,并揭示了拉速、结晶器锥度和保护渣性能变化对该钢种在结晶器内凝固热行为的影响.

Based on the thermal mechanical coupling finite element model described in Part I of present work, the thermal behavior of one high strength ship plate steel solidifying in slab continuous casting mold was simulated with the practical continuous casting conditions of a steel plant, and the availability of the model was verified by in.plant measurement temperature. With this model, the thickness distributions and thermal behavior of air gap, mold flux （including liquid flux and solidified flux）, and the variation characteristics of heat flux and surface temperature, as well as the influence of casting speed, mold taper, and mold flux properties mold were investiea.ted. on thermal behavior of the steel solidifying in