帘线钢SWRH82A铸坯加热过程中钛夹杂的固溶  

Solid solution of Ti inclusions during heating process for cast bloom of tire cord steel SWRH82A

作　　者：张京[1] 薛正良[1] 蒋跃东[2] 熊锐[1] 邹峰[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,武汉430081 [2]武汉钢铁(集团)公司研究院,武汉430080

出　　处：《材料与冶金学报》2014年第4期242-246,共5页Journal of Materials and Metallurgy

基　　金：武汉市科技攻关计划项目资助(项目编号:201210321098)

摘　　要：根据热力学和动力学理论，研究了过共析帘线钢SWRH82A铸坯中钛夹杂固溶的条件．研究表明：（1）当SWRH82A铸坯加热温度达到1347K时，奥氏体中TiN具备固溶的热力学条件；（2）当加热温度达到1360K时，Ti（C，N）夹杂将开始溶解；（3）在1423～1523K的加热升温阶段，由于钛夹杂的分解并向奥氏体中扩散固溶，使得小颗粒钛夹杂逐渐消失，大颗粒钛夹杂尺寸变小；在铸坯高温加热后的冷却降温过程中，固溶在奥氏体深处的Ti和N会重新结合析出TiN夹杂，但缺少继续长大的动力学条件；固溶在残余钛夹杂周边奥氏体中的n和N会以残余钛夹杂为核心不断析出长大．According to the thermodynamic and kinetic theory, the solution conditions of Ti inclusions of hypereutectoid tire cord steel SWRH82A cast slab were studied. The results showed that： （ 1 ） When the heating temperature of SWRH82A cast slab is 1 347 K, it is possible for TiN to be dissolved in austenite in the thermodynamic sense; （2） When the heating temperature is 1 360 K, Ti （C, N） inclusions begin to dissolve gradually; （3） At temperature from 1 423 - 1 523 K, due to decomposition and diffusion of Ti inclusions into austenite, the small particles of Ti inclusions disappear gradually, the large Ti inclusions particles become smaller. During the cooling process from a high temperature, TiN inclusions will be re - precipitated owing to the mutual reaction of Ti and N dissolved in the depths of austenite, however the TiN inclusions can＇t grow up because there is lack of the kinetic conditions. Ti and N dissolved around the residual Ti inclusions in the austenite will constantly precipitate and grow up on the core of residual Ti inclusions.

关 键 词：过共析帘线钢 钛夹杂 固溶 

分 类 号：TF762[冶金工程—钢铁冶金]