含铈IF钢中含钛夹杂物的析出行为

通过热力学计算研究了IF钢中含钛夹杂物的形成过程以及铈对钢液中Al2O3夹杂物的变质机理,并采用扫描电镜、能谱仪观察和分析了IF钢和含铈IF钢中的含钛夹杂物。热力学计算和扫描电镜观察结果表明:TiN不能在熔炼温度下形成;在IF钢液凝固的过程中TiN以异质形核的形式生成并长大,生成TiN-Al2O3夹杂物;在含铈IF钢中TiN-Al2O3夹杂物被稀土铈变质为TiN-CeAlO3夹杂物,稀土铈减小了含铈IF钢中含钛复合夹杂物的尺寸。

Precipitation behaviors of titaniferous inclusions in cerium-containing IF steel

The formation of titaniferous inclusions and the mechanism of modifying Al2O3 inclusion of cerium in IF steel were studied by thermodynamic calculation??Scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to observe and analyze the titaniferous inclusions in IF steel and cerium- containing IF steel??The results of thermodynamic analysis and observation by scanning electron microscopy show that TiN cannot form at the steelmaking temperature??During the solidification process of IF steel, TiN generates by heterogeneous nucleation and to form TiN- Al2O3 inclusion??TiN- Al2O3 inclusion can be modified into TiN- CeAlO3 inclusion by cerium in cerium- containing IF steel??The size of titaniferous compound inclusions in cerium- containing IF steel is reduced by cerium??