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 (4): 524-527.DOI: -

• 材料与冶金 • 上一篇    下一篇

超快冷终冷温度对桥梁钢组织性能的影响

陈俊，唐帅，刘振宇，王国栋   

  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:2012-10-23 修回日期:2012-10-23 出版日期:2013-04-15 发布日期:2013-06-19
  • 通讯作者: 陈俊
  • 作者简介:陈俊(1982-)，男，河南南阳人，东北大学博士研究生；刘振宇(1967-)，男，内蒙古赤峰人，东北大学教授，博士生导师；王国栋(1942-)，男，辽宁大连人，东北大学教授，博士生导师，中国工程院院士.
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N110607003，N100507002，N110307002).

Effects of UFC Final Cooling Temperature on Microstructure and Mechanical Properties of Bridge Steels

CHEN Jun， TANG Shuai， LIU Zhenyu， WANG Guodong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2012-10-23 Revised:2012-10-23 Online:2013-04-15 Published:2013-06-19
  • Contact: CHEN Jun
  • About author:-
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摘要： 两阶段轧制后，采用超快冷对实验钢进行冷却，研究了超快冷终冷温度对高强桥梁钢组织性能的影响.结果表明，超快冷终冷温度显著影响实验钢的组织特征，随着超快冷终冷温度的降低，实验钢的显微组织由粒状贝氏体为主逐渐演变为板条贝氏体为主，且M/A尺寸显著细化.明确了超快冷终冷温度对实验钢力学性能的影响规律，且在236℃的超快冷终冷温度条件下，实验钢的屈服强度、抗拉强度、屈强比、-40℃冲击功和延伸率分别为745MPa，961MPa，078，1665J和168%，实现了强度、韧性和塑性的平衡，同时获得了低屈强比.

关键词: 桥梁钢, 超快冷, 屈强比, 显微组织, 力学性能

Abstract: The testing steel was cooled using ultra fast cooling (UFC) after two stage hot rolling， and the effects of UFC final cooling temperatures on the microstructure and mechanical properties of the high strength bridge steel were investigated. The results showed that the microstructural characteristics of the testing steel were obviously affected by the UFC final cooling temperatures. The main part of the microstructure of the testing steel changed from the granular bainite to the lath bainite gradually and the M/A size was significantly refined with the decrease of UFC final cooling temperatures. The effects of UFC final cooling temperatures on mechanical properties of the testing steels was also revealed. For the UFC final cooling temperature of 236℃， the yield strength， tensile strength， yield ratio， impact energy with the testing temperature of -40℃ and elongation were 745MPa， 961MPa， 078， 1665J and 168%， respectively. The balance of strength， toughness and plasticity was achieved and lower yield ratio was also gained.

Key words: bridge steels, ultra fast cooling, yield ratio, microstructure, mechanical properties

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