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采用偏析模型和动力学方法研究了钢液凝固过程中元素偏析及冷却速率对氮化物夹杂物析出长大的影响;计算结果表明,凝固末期残余液相中的Ti,V,C和N等元素的浓度分别提高到其初始浓度的4.68、2.34、4.55和3.3倍;通过降低钢中Ti和N含量及增大冷却速率从0.27 K/s到37.96 K/s,可以推迟TiN夹杂物的析出时机并减小其尺寸。以规则溶液亚点阵模型为基础,计算了重轨钢中碳氮化钒钛复合夹杂物的形成过程。
The effects of element segregation and cooling rate on the precipitation and growth of nitride inclusions were investigated by segregation model and kinetic method. The calculated results show that Ti, V, C and N in the residual liquid phase Were increased to 4.68, 2.34, 4.55 and 3.3 times their initial concentrations, respectively; and TiN inclusions could be postponed by reducing the Ti and N content in the steel and increasing the cooling rate from 0.27 K / s to 37.96 K / s And reduce its size. Based on the sub-lattice model of regular solution, the formation process of vanadium carbonitride composite inclusions in heavy rail steel was calculated.