钢锭顺次凝固行为的物理模拟

Physical simulation on sequential solidification behavior of ingot

实现钢锭顺次凝固可以有效补缩,改善钢锭内部质量。本文依据相似原理,以80 t矩形钢锭为原型建立与原型尺寸比为1:10的物理模型,用硫代硫酸钠模拟钢锭的顺次凝固行为。通过对不同梯次冷却条件下的对比试验得出:实现顺次凝固的梯次温度差要大于40℃;为有效实现钢锭顺次凝固,梯次冷却强度在前30 min采用较小的温差,在30 min后采用较大的温度差。

The internal quality of ingot can be improved by feeding effectively in sequential solidification. A physical model of 1/10 linear scale for 80 t ingot is established based on the similarity principle. The sequential solidification behavior of ingot is simulated in different temperature gradients using sodium thiosulfate. The physical simulation results show that the echelon temperature difference must be more than 40 ℃ to realize the sequential solidification. The echelon cooling strength is taking a smaller temperature difference in the first 30 mins and a large temperature difference after 30 mins.