浇注温度对双辊薄带凝固组织影响的模拟预测

Computer Aided Prediction of Effects of Pouring Temperatureon on the Solidification Structure for Twin-roll Thin Strip

在已建立的理论数学模型的基础上 ,以 1Cr18Ni9Ti不锈钢为研究对象 ,模拟预测了在薄带厚度保持不变条件下浇注温度对薄带凝固组织中柱状晶区比例、柱状枝晶间距和取向度的影响规律。结果表明 :随着浇注温度升高 ,1Cr18Ni9Ti不锈钢双辊薄带凝固组织中柱状晶区比例首先增大 ,然后又逐渐减小。而柱状枝晶取向度和枝晶间距则随着浇注温度的升高而减小 ,但在较高的浇注温度条件下 ,柱状枝晶间距在凝固结束时有突然增大的趋势。

On the basis of the theoretically developed mathematical model, the influence of pouring temperature on the proportion of columnar crystal zone, the columnar dendrite arm spacing and the directional orientation in the solidification structrue of 1Cr18Ni9Ti stainless steel twin-roll thin strip with constant thickness was predicted. The simulated results indicated that with the pouring temperature increase, the proportion of columnar crystal zone increased first, and then declined gradually, while the columnar dendrite arm spacing and the directional orientation decreased with pouring temperature increase but the columnar dendrite arm spacing had a suddenly increasing trend at higher pouring temperature by solidification end.