东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (6): 780-785.DOI: 10.12068/j.issn.1005-3026.2015.06.006

• 材料与冶金 • 上一篇    下一篇

含B钒微合金钢的连续冷却相变行为

金光秀, 高彩茹, 杜林秀   

  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:2014-04-30 修回日期:2014-04-30 出版日期:2015-06-15 发布日期:2015-06-11
  • 通讯作者: 金光秀
  • 作者简介:金光秀(1975- ),男,朝鲜金策工业综合大学讲师,东北大学博士研究生; 杜林秀(1962-),男,河北滦县人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(2011BAE25B03).

Phase Transformation Behaviors of Boron-Vanadium Microalloyed Steels During the Continuous Cooling

KIM Kwang-su, GAO Cai-ru, DU Lin-xiu   

  1. State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China.
  • Received:2014-04-30 Revised:2014-04-30 Online:2015-06-15 Published:2015-06-11
  • Contact: GAO Cai-ru
  • About author:-
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摘要: 为开发一种新的低成本高性能含B钒微合金钢和建立其TMCP生产工艺,用MMS-200热力模拟试验机研究了实验钢在连续冷却条件下的相变规律,绘制出实验钢的静态CCT曲线和动态CCT曲线.结果表明:微量的B提高了钒微合金钢过冷奥氏体稳定性,促进了针状铁素体形成,在比较宽的冷却速度范围内能得到贝氏体组织;未变形钢相比于变形钢,在更低的冷却速度甚至0.5℃/s的冷却速度下能得到大部分的贝氏体组织,但两者在5℃/s以上的冷却速度下都得到全部贝氏体组织;变形降低了奥氏体稳定性,促进铁素体转变,含硼钢铁素体转变存在的冷速升高到2℃/s,不含硼钢的其冷速升高到15℃/s;钒微合金钢中B有利于获得高强度的贝氏体组织,冷速5℃/s以上时相变后含硼钢的硬度都高于变形及未变形不含硼钢的硬度.

关键词: 连续冷却相变, 钒微合金钢, 含硼钢, 贝氏体转变, 显微组织

Abstract: In order to develop a low cost and high performance boron-vanadium microalloyed steel and establish its TMCP process, the transformation mechanism of the test steel under continuous cooling was studied and the static and dynamic CCT curves of the test steel were also obtained by means of MMS-200 thermo-mechanical simulator. The results showed that, by addition of the trace boron, the stability of overcooling austenite of the vananium microalloyed steel was increased, and the formation of acicular ferrite was promoted, while the bainite can be obtained under wider cooling rates. Compared to the deformed steel, bainite was the major microstructure which obtained in the undeformed steel under the very slow cooling rate even only 0.5℃/s, but when the cooling rate was higher than 5℃/s, fully bainite was obtained in both the deformed and undeformed steels. The stability of austenite was reduced and the formation of the ferrite was promoted by deformation, thus ferrite transformation proceeded under cooling rate lower than 2℃/s and 15℃/s in the boron steel and non-boron steel, respectively. For vanadium microalloyed steel, boron is beneficial to obtaining high strength bainite, therefore when the cooling rate is higher than 5℃/s, Vickers hardness of boron steel is higher than that of non-boron steel under deformed and undeformed status.

Key words: continuous cooling transformation, vanadium microalloyed steel, boron steel, bainite transformation, microstructure

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