东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (6): 820-823.DOI: -

• 材料与冶金 • 上一篇    下一篇

590MPa级热轧V-N高强车轮钢组织性能控制

胡军1，杜林秀1，王万慧2，李晶1   

  1. (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；2.中冶赛迪工程技术股份有限公司，重庆401122)
  • 收稿日期:2012-12-31 修回日期:2012-12-31 出版日期:2013-06-15 发布日期:2013-12-31
  • 通讯作者: 胡军
  • 作者简介:胡军(1987-)，男，辽宁鞍山人，东北大学博士研究生；杜林秀(1962-)，男，辽宁本溪人，东北大学教授，博士生导师.
  • 基金资助:
    国家科技支撑计划项目(2011BAE13B03).

Microstructural Control and Mechanical Properties of 590MPa Grade HotRolled VN High Strength Steel

HU Jun1， DU Linxiu1， WANG Wanhui2， LI Jing1   

  1. 1. The State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China; 2. CISDI Engineering Co.， Ltd.， Chongqing 401122， China.
  • Received:2012-12-31 Revised:2012-12-31 Online:2013-06-15 Published:2013-12-31
  • Contact: HU Jun
  • About author:-
  • Supported by:
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摘要： 对一种低成本V-N微合金化钢进行了控轧控冷实验，探讨了相变机理与析出行为，并系统地研究了其综合力学性能.结果表明，显微组织为多边形铁素体、粒状贝氏体及少量的针状铁素体，纳米尺度V(C，N)析出质点弥散地分布于铁素体或贝氏体铁素体基体内部.抗拉强度615MPa实验钢具有优良的断后延伸率，冷弯性能合格，扩孔率达到95%，满足轮辐用钢的加工要求，低温冲击性能良好.细晶强化、位错强化、析出强化、相变强化为主要强化机制.

关键词: V-N微合金化钢, 汽车板, 组织和力学性能, 强化机制

Abstract: The controlled rolling and controlled cooling test was conducted on lowcost VN microalloyed steel. The transformation mechanisms and precipitation behavior were discussed， and the comprehensive mechanical properties were systematically studied. The results indicated that the microstructure composes of polygonal ferrite， granular bainite and small amount of acicular ferrite. The nanoscaled V(C， N) precipitates distribute dispersedly in the matrix of ferrite or bainiteferrite. The experimental steel with tensile strength 615MPa possesses excellent elongationafterfracture. The cold bending property is qualified. The holdexpansion ratio is 95%， which meet the demand of the automotive wheel disc. The low temperature impact toughness is outstanding. The fine grain strengthening， dislocation strengthening， precipitation hardening and transformation strengthening are the main strengthening mechanisms.

Key words: VN microalloyed steel, automotive plate, microstructure and mechanical properties, strengthening mechanism

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