东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2007, Vol. 28 ›› Issue (4): 510-513+521.DOI: -

• 论著 • 上一篇    下一篇

微合金化对超细晶中厚板显微组织的影响

王立军;姚连登;任海鹏;刘春明;   

  1. 东北大学材料各向异性与织构教育部重点实验室;宝山钢铁股份有限公司;东北大学材料各向异性与织构教育部重点实验室;东北大学材料各向异性与织构教育部重点实验室 辽宁沈阳110004;上海201900;辽宁沈阳110004;辽宁沈阳110004
  • 收稿日期:2013-06-24 修回日期:2013-06-24 出版日期:2007-04-15 发布日期:2013-06-24
  • 通讯作者: Wang, L.-J.
  • 作者简介:-
  • 基金资助:
    中国金属学会-国际钒技术委员会资助项目;;

Effect of microalloying on ultrafine-grained microstructure of plates

Wang, Li-Jun (1); Yao, Lian-Deng (2); Ren, Hai-Peng (1); Liu, Chun-Ming (1)   

  1. (1) Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110004, China; (2) Baoshan Iron and Steel Co. Ltd., Shanghai 201900, China
  • Received:2013-06-24 Revised:2013-06-24 Online:2007-04-15 Published:2013-06-24
  • Contact: Wang, L.-J.
  • About author:-
  • Supported by:
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摘要： 在Gleeble 1500热模拟机上,通过820~790℃温度范围内的多道次热压缩变形模拟了中厚板的精轧工艺,考察了不同铌、钒(氮)含量的低碳钢的组织演变过程、微合金元素的碳氮化物的析出行为和对形变诱导铁素体相变(DIFT)的影响.结果表明:变形过程中有部分奥氏体转变为铁素体,依变形的温度不同在变形间隔时间内有逆相变或亚动态相变发生;变形后快速冷却得到平均晶粒直径低于5μm的超细晶组织.单独添加钒对DIFT具有抑制作用,可以细化显微组织;钒-氮复合添加促进DIFT,但使组织粗化;添加铌基本不会抑制DIFT,能显著细化显微组织.变形后冷速越小,钢种间差距越明显.微合金化元素的作用与其在变形过程中...

关键词: 微合金化, 中厚板, 超细晶粒, 形变诱导铁素体相变, 碳氮化物

Abstract: The microstructure evolution, precipitation behavior of carbonitride as microalloying element and its effects on deformation induced ferrite transformation (DIFT) of mild steel with various Nb, V (N) content were investigated on a Gleeble 1500 thermomechanical simulator through multi-pass thermocompression in the temperature range of 820-790°C to simulate the finish rolling process of plates. The results showed that part of austenite is transformed into ferrite through DIFT with reversed or meta-dynamic transformation found at intervals of deformation and depending on its temperature; in the microstructure the mean grain size is less than 5μm through the quick chilling after multi-pass deformation; DIFT is inhibited by adding V only to the steel to get the microstructure refined, while adding V-N compound to the steel will enhance DIFT to coarsen the microstructure; adding Nb to the steel will not inhibit DIFT but get the microstructure refined remarkably; the slower the chilling rate after deformation, the more apparent the difference between such steel. It was revealed that the effects of microalloying elements are correlated to the dissolution and precipitation behavior of carbonitride.

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