炼钢

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重轨钢中碳氮化物析出动力学分析与控制

  

  1. (1. 北京科技大学 冶金与生态工程学院,北京 100083; 2. 安徽工业大学 冶金与资源学院,安徽 马鞍山 243002; 3. 攀枝花钢钒有限公司 提钒炼钢厂,四川 攀枝花 617000)
  • 接受日期:1900-01-01 出版日期:2016-10-05

Dynamics of carbonitrides inclusions precipitation during solidification in heavy rail steels

  • Accepted:1900-01-01 Online:2016-10-05

摘要: 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。

关键词: 重轨钢, 氮碳化物夹杂物, 析出, 动力学分析

Abstract: In the current work,the segregation of elements was studied on basis of segregation model and influence of cooling rate on precipitating and growing up of nitride inclusions was investigated during solidification. The calculating results showed that concentration of Ti,V,C and N elements were 4.68,2.34,4.55,and 3.3 times than initial concentration near the liquid-solid interfaces. It could postpone the precipitation of TiN inclusions and decrease the size of them by reducing the content of Ti and N in molten steel and increasing cooling rate from 0.27 K/s to 37.96 K/s. According to regular solution sublattice model,themodynamic calculation of carbonitrides inclusions formation mechanism was performed in heavy rail steel.

Key words: heavy rail steel, carbonitrides inclusions, precipitation, dynamics analysis