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 (8): 1117-1119.DOI: 10.12068/j.issn.1005-3026.2014.08.012

• 材料与冶金 • 上一篇    下一篇

Nb对低碳微合金钢连续冷却相变行为的影响

王壮飞，唐帅，刘振宇，王国栋   

  1. (东北大学 轧制技术及连轧自动化国家重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2013-09-16 修回日期:2013-09-16 出版日期:2014-08-15 发布日期:2014-04-11
  • 通讯作者: 王壮飞
  • 作者简介:王壮飞(1979-)，男，辽宁鞍山人，东北大学博士研究生；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(51204049).

Effect of Nb on Continuous Cooling Transformation Behavior of Low Carbon Microalloyed Steel〓

WANG Zhuangfei， TANG Shuai， LIU Zhenyu， WANG Guodong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2013-09-16 Revised:2013-09-16 Online:2014-08-15 Published:2014-04-11
  • Contact: WANG Zhuangfei
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摘要： 结合膨胀法和金相观察绘制了无Nb和添加质量分数0042%Nb的实验钢的动态CCT曲线，阐明了Nb对低碳微合金钢相变行为和相变组织的影响规律.结果表明，添加Nb可显著细化铁素体晶粒，抑制铁素体形成，促进贝氏体形成，使CCT曲线移向右下方，缩小铁素体和珠光体相变区，显著扩大贝氏体相变区.此外，添加Nb可显著增强细晶强化、析出强化和相变强化效果，使实验钢维氏硬度显著提高.

关键词: 低碳, 微合金钢, Nb, CCT曲线, 相变

Abstract: The dynamic continuouscoolingtransformation (CCT) diagrams of Nbfree and 0042 wt% Nb tested steels were plotted by means of a dilatometry method combined with metallography. The influence of Nb on the continuous cooling transformation behavior and transformation microstructure of low carbon microalloyed steel was elucidated. The results show that the addition of Nb can significantly refine ferrite grain size and suppress the formation of ferrite， promoting the formation of bainite， and can make CCT curves move down and right， reducing the ferrite and perlite transformation field and expanding the bainite transformation field. Moreover， the Vickershardness can be significantly increased due to grain refinement， precipitation hardening and transformation strengthening by the addition of Nb.

Key words: low carbon, microalloyed steel, Nb, CCT curve, transformation

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