IF钢凝固过程中Al_2O_3-TiN复合夹杂物的形成机理

以理论分析和实验研究相结合的方式分析了IF钢凝固过程中Al2O3-TiN复合夹杂物的形成机理.结果表明,以凝固分率0.9为界限,钢水凝固过程中Al2O3和TiN先后通过异质形核方式析出并结合形成Al2O3-TiN复合夹杂物;冷却速率越小,复合夹杂物粒径越大;在冷却速率一定时,可作为异质形核核心的夹杂物的粒径越大,凝固过程中析出的复合夹杂物的长大程度越小;复合夹杂物内层Al2O3粒径越小,外层TiN长大程度越明显.

Formation Mechanism of Al2O3-TiN Compound Inclusion During IF Steel Solidification Process

The mechanism of precipitation and growth of Al2O3-TiN compound inclusions during IF steel solidification process was researched by experiments and theoretical analysis.The results showed that when the solid fraction exceeds 0.9,Al2O3 and TiN precipitate successively by heterogeneous nucleation and Al2O3-TiN compound inclusions are formed.The final diameter of compound inclusions increases with the decrease of cooling rate.When the cooling rate is constant,the growing extent of compound inclusions decreases with the increase of the radius of inclusions used for nucleus.The growing extent of TiN inclusions formed outside the Al2O3-TiN compound inclusions increases with the decrease of the radius of Al2O3 inclusions inside.