东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (9): 1294-1298.DOI: -

• 论著 • 上一篇    下一篇

IF钢凝固过程中Al_2O_3-TiN复合夹杂物的形成机理

李志强;袁磊;刘涛;于景坤;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 出版日期:2012-09-15 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50904016)

Formation mechanism of Al2O3-TiN compound inclusion during IF steel solidification process

Li, Zhi-Qiang (1); Yuan, Lei (1); Liu, Tao (1); Yu, Jing-Kun (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Online:2012-09-15 Published:2013-04-04
  • Contact: Yu, J.-K.
  • About author:-
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摘要： 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.

关键词: 凝固, 复合夹杂物, Al2O3-TiN, 机理, 微观偏析

Abstract: 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.

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