东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (6): 823-826+847.DOI: -

• 论著 • 上一篇    下一篇

不同工艺低碳Nb-B贝氏体钢组织性能

段争涛;李艳梅;朱伏先;樊中免;   

  1. 东北大学轧制技术与连轧自动化国家重点实验室;沈阳工业大学化工装备学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N090307004)

Microstructures and mechanical properties of low carbon Nb-B bainitic steel with different processing

Duan, Zheng-Tao (1); Li, Yan-Mei (1); Zhu, Fu-Xian (1); Fan, Zhong-Mian (2)   

  1. (1) State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China; (2) School of Chemical Equipment, Shenyang University of Technology, Liaoyang 111003, China
  • Received:2013-06-19 Revised:2013-06-19 Published:2013-04-04
  • Contact: Duan, Z.-T.
  • About author:-
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摘要： 对一种不添加其他微合金元素的低碳Nb-B微合金贝氏体钢在不同工艺的组织和力学性能进行研究.结果表明,终轧温度为850℃,冷却速度10℃/s左右,终冷温度560℃时,实验钢的屈服强度和抗拉强度分别为495和720MPa,-20℃冲击功和延伸率分别为159 J和23%,实验钢组织为粒状贝氏体和准多边形铁素体;终冷温度降至480℃,实验钢组织为粒状贝氏体,屈服强度和-20℃冲击功分别提高51 MPa和93 J;终轧温度降至810℃时,屈服强度相对增加24MPa;冷却速度增大到25℃/s,组织为粒状贝氏体、少量的针状铁素体和板条贝氏体,屈服强度和抗拉强度分别为655和777 MPa,而-20℃冲击功和...

关键词: 终冷温度, 终轧温度, 冷却速度, 组织, 力学性能

Abstract: The microstructures and mechanical properties of a low carbon Mn-Nb-B bainitic steel were investigated. The results revealed that when the finish rolling temperature is 850°C, the cooling rate is about 10°C/s and the stop cooling temperature is 560°C. The microstructure of tested steel is quasi-polygonal ferrite and granular bainite. The yield strength, tensile strength, impact energy (-20°C) and elongation are 495 and 720 MPa, 159 J, 23%, respectively. As the stop cooling temperature is decreased to 480°C, the yield strength and tensile strength are increased 51 MPa and 93 J respectively. The yield strength is increased 24 MPa when the finish rolling temperature is decreased to 810°C. When the cooling rate is increased to 25°C/s, the microstructure is composed of granular bainite, acicular ferrite and lath bainite. The yield strength, tensile strength, impact energy (-20°C), elongation are 655 and 777 MPa, 226 J, 20%, respectively. The substructure can be refined by accelerated cooling. The strength of tested steel can be increased observably through the substructure strengthing and the existence of lath bainite.

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