82A钢凝固过程中TiN夹杂析出热力学和动力学  

Thermodynamics and dynamics of TiN precipitation during solidification of steel 82A

作　　者：蒋跃东[1,2] 薛正良[1] 吴杰[2] 桂美文[2] 郑云峰[2] 

机构地区：[1]武汉科技大学材料与冶金学院,湖北武汉430081 [2]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《武汉科技大学学报》2010年第4期358-362,共5页Journal of Wuhan University of Science and Technology

基　　金：湖北省教育厅优秀中青年科技创新团队计划(T200609)

摘　　要：用热力学和动力学方法研究82A钢液凝固过程元素偏析及其对TiN夹杂析出的影响。热力学分析表明,Ti的偏析比远高于N的偏析比;凝固冷却速度从6 K/min增至600 K/min过程中,凝固冷却速度对Ti、N凝固偏析比影响不大;钢液初始Ti含量降至0.000 2%、初始氮含量为0.002%~0.004%时,在凝固末期仍有TiN夹杂析出。动力学分析表明,随着钢液凝固冷却速度的加快,凝固析出的TiN颗粒尺寸明显变小。The segregation of titanium and nitrogen during the solidification of steel 82A and its effect on the precipitation of TiN inclusion was studied on the basis of thermodynamics.It is found that：（1） The segregation ratio of titanium is far greater than that of nitrogen;the cooling rate of 82A solidification has little effect on the segregation ratios of titanium and nitrogen when the cooling rate increases from 6K/min to 600K/min.（2） Under the current level of N content for 82A,it is totally impossible to avoid TiN inclusion precipitation during the solidification of steel 82A even if the content of titanium is reduced to 0.0002%.（3） With the increase of the cooling rate of 82A solidification,the size of TiN inclusion precipitated during solidification is significantly reduced.

关 键 词：82A钢 TiN夹杂 热力学 动力学 

分 类 号：TF762.8[冶金工程—钢铁冶金]