东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (1): 47-50.DOI: 10.12068/j.issn.1005-3026.2014.01.011

• 材料与冶金 • 上一篇    下一篇

亚快速凝固下磷对铁素体体积分数与形态的影响

邱以清，刘振宇，李娜，王国栋   

  1. (东北大学 轧制技术及连轧自动化国家实验室， 辽宁 沈阳110819)
  • 收稿日期:2012-12-01 修回日期:2012-12-01 出版日期:2014-01-15 发布日期:2013-07-09
  • 通讯作者: 邱以清
  • 作者简介:邱以清(1962-)，男，山东滕州人，东北大学副教授；刘振宇(1967-)，男，内蒙古赤峰人，东北大学教授，博士生导师；王国栋(1942-)，男，辽宁大连人，东北大学教授，博士生导师，中国工程院院士.
  • 基金资助:
    国家自然科学基金资助项目(51074051).

Influence of P on Volume Fraction and Morphology of Ferrite Under Subrapid Solidification

QIU Yiqing， LIU Zhenyu， LI Na， WANG Guodong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2012-12-01 Revised:2012-12-01 Online:2014-01-15 Published:2013-07-09
  • Contact: QIU Yiqing
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摘要： 通过金相组织观察，分析了不同磷含量双辊连铸薄带中的铁素体.实验结果表明，与同样磷含量的铸锭相比，铸带中的铁素体体积分数明显增大；对于同一个铸带，表层内铁素体体积分数小于中心区域，且磷含量越低表层内铁素体体积分数越小；随着磷含量的升高，铸带中的铁素体形态逐渐由针状向表面圆滑的块状转变.通过理论分析得出，快速冷却有利于钢中铁素体的稳定；表面圆滑的块状铁素体是由钢液中直接析出的，而针状铁素体是由固态奥氏体中析出的.

关键词: 亚快速凝固, 双辊连铸薄带, 磷含量, 体积分数, 形态

Abstract: The ferrite in twinroll cast strips with different P contents was analyzed by the observation of the microstructure. The results showed that the volume fraction of ferrite in the cast strip was obviously more than that in the cast billet with the same P content. In a cast strip， the volume fraction of ferrite in the surface layer was less than that in the center area， and the ferrite in the surface layer was reduced with the reduction of the P content. The morpology of the ferrite in the cast strip was gradually transformed from the acicular form into the polygonal form with smooth surface with the increase of the P content. Through the theoretical analysis， it was shown that the rapid cooling favored ferrite stabilizing in steels， and the polygonal ferrite with smooth surface directly precipitated from the liquid steel while the acicular ferrite precipitated from the solid austenite.

Key words: subrapid solidification, twinroll cast strip, P content, volume fraction, morphology

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