东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (5): 686-689.DOI: 10.12068/j.issn.1005-3026.2014.05.018

• 材料与冶金 • 上一篇    下一篇

板条贝氏体中少量铁素体对高强钢强韧性的影响

宋峰雨1,张朋彦2,王平1,朱伏先2   

  1. (1东北大学 材料电磁过程研究教育部重点实验室, 辽宁 沈阳110819; 2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:2013-08-21 修回日期:2013-08-21 出版日期:2014-05-15 发布日期:2014-08-18
  • 通讯作者: 宋峰雨
  • 作者简介:宋峰雨(1985-),男,辽宁锦州人,东北大学博士研究生;王平(1964-),男,黑龙江哈尔滨人,东北大学教授,博士生导师;朱伏先(1946-),男,福建寿明人,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(51174058).

Effects of the Small Amount of Ferrite in Bainite Laths on the Strength and Toughness of High Strength Steels

SONG Fengyu1, ZHANG Pengyan2, WANG Ping1, ZHU Fuxian2   

  1. 1 The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China; 2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2013-08-21 Revised:2013-08-21 Online:2014-05-15 Published:2014-08-18
  • Contact: ZHU Fuxian
  • About author:-
  • Supported by:
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摘要: 以一种低成本高强钢为研究对象,对其实施了不同冷却模式的TMCP工艺实验,并利用光学显微镜、拉伸试验机、冲击试验机对其组织与力学性能进行了研究.实验结果表明:通过相变强化和在两相区的保温处理,在以板条贝氏体为主的实验钢组织中引入少量铁素体,使其拥有高强度、高冲击韧性等综合力学性能.在同类工艺条件下,试验钢的抗拉强度、屈服强度以及屈强比随终冷温度降低而升高,延伸率和断面收缩率随终冷温度降低而降低.

关键词: 高强工艺钢, 组织, 力学性能, 贝氏体, 冲击韧性

Abstract: A low cost high strength steel was studied by TMCP processing under different cooling modes, the microstructures and mechanical properties were investigated by the optical microscope, tensile testing machine and shock testing machine respectively. The results showed that the transformation strengthen and insulation treatment in two phase region can bring a small amount of ferrite into the tested steel, in which the original microstructure is mainly lath bainite, that leads to high strength and high shock toughness of the tested steel. Under the similar conditions, the tensile strength, yield strength and yield ratio increase while the elongation and reduction of area decrease with the decrease of the final cooling temperature.

Key words: high strength steels, microstructure, mechanical properties, bainite, impact toughness

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