东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2009, Vol. 30 ›› Issue (10): 1417-1420.DOI: -

• 论著 • 上一篇    下一篇

高强细晶IF钢微观形貌的研究

乔立峰;张红梅;刘振宇;王国栋;   

  1. 东北大学轧制及连轧自动化国家重点实验室;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2009-10-15 发布日期:2013-06-22
  • 通讯作者: Zhang, H.-M.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50734002)

Micromorphologic study on the super-fine grain and high-strength IF steel

Qiao, Li-Feng (1); Zhang, Hong-Mei (1); Liu, Zhen-Yu (1); Wang, Guo-Dong (1)   

  1. (1) The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2009-10-15 Published:2013-06-22
  • Contact: Zhang, H.-M.
  • About author:-
  • Supported by:
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摘要： 以新型高强细晶IF钢为研究对象,通过实验室冷轧和退火实验,研究了退火工艺对高强细晶IF钢微观形貌的影响.通过微观组织观察可以发现,化学成分的改善、轧制及退火工艺的控制可以使这种钢不仅具有细小的晶粒,而且存在10～40nm的细小析出物Nb(C,N);晶界附近析出物非常稀少,称之为PFZ(晶界无析出物区),且仅存在于晶界的一侧;部分三叉晶界处存在晶界合并现象.实验表明,由于这种钢中Nb析出物非常细小,使晶粒大大细化;同时由于PFZ带的存在,使这种钢具有较低屈强比及较高延伸率,且成形性能良好.

关键词: 高强细晶IF钢, 显微组织, 铌析出物, PFZ

Abstract: The effect of annealing process on the micromorphology of the new-type SFG HSS (super-fine grain, high-strength steel) sheet was studied via cold rolling and annealing in lab. The observation results of microstructure showed that the super-fine grains can be obtained by improving chemical composition and controlled rolling annealing, and the tiny Nb(C, N) precipitates (10~40 nm) are found and they are rare in the vicinity of grain boundary, i.e., the PFZ zone (precipitate-free zone) which exists only the one side of grain boundary. Moreover, some grain boundaries are merged together at part of trifurcate grain boundaries. Experiment results showed that the Nb precipitates in such steel are so tiny that the grain refining comes up to a very high degree and, due to the PFZ, the steel has a low ratio of yield strength to tensile strength with high elongation and favorable formability.

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