中文摘要：

利用连铸坯凝固过程热模拟装置研究了过热度、冷却强度和强制对流对200 mm厚高碳T10A钢连铸坯凝固组织的影响。正交试验显示高碳T10A钢的凝固组织对工艺参数非常敏感,等轴晶率在0~65%之间剧烈变化。其中,强烈冷却和低过热度会导致穿晶组织,高过热度配合弱冷可获得较高等轴晶率,但需要降低拉坯速率。过热度为20~40℃配合适当的冷却条件能够获得约50%的等轴晶率,可兼顾铸坯质量和生产效率。

英文摘要：

The effect of superheat,cooling intensity and forced convection on the solidification structure of a 200 mm high carbon T10 A steel billet were observed by a thermal simulating setup,which was developed to investigate the solidification process of continuous casting billet / slab. The orthogonal experiments indicated that T10 A high carbon steel,which equiaxed grain rates changed in a range of0 ~ 65%,was very sensitive to the processing parameters of continuous casting. Entire columnar structure was observed in a sample solidified with low superheat plus strong cooling. On the contrary,high superheat and weak cooling could lead to a high equiaxed grain ratio. Inevitably,this process must result in a low pulling rate. Fifty percent of equiaxed grains could be achieved when superheat was20 ~ 40 ℃ with an appropriate cooling intensity,and these parameters were expected to be the crafting window which could balance the quality of billet and production efficiency.