一、前言钢的凝固以及在冷却过程中产生的偏析、三、四次夹杂物以及其他各种低、高倍缺陷对钢质造成的不良影响,在以后的热处理和压力加工过程中也难以完全消除。因此,应该重视对钢凝固组织和凝固过程的控制。各种不同的凝固条件(例如不同的温度梯度,冷却速度、凝固速度、溶质分布、钢液流动等),得到的凝固组织也不同。因此,我们可以从已经凝固了的钢的 I. Preface The solidification of steel and the segregation during the cooling process, the third and fourth inclusions and other various low and high magnification defects on the steel adverse effects in the subsequent heat treatment and pressure processing is also difficult to completely eliminate . Therefore, attention should be paid to the control of solidification and solidification of steel. Different solidification conditions (eg, different temperature gradients, cooling rates, solidification rates, solute distribution, flow of molten steel, etc.) also result in different solidified structures. So we can get from the already solidified steel