东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (10): 1408-1411.DOI: 10.12068/j.issn.1005-3026.2014.10.010

• 材料与冶金 • 上一篇    下一篇

连续退火工艺对B250P钢组织性能的影响

蒋光炜1，王春柳2，曹宇1，邸洪双1   

  1. (1 东北大学 轧制技术与连轧自动化国家重点实验室， 辽宁 沈阳110819；2 中国一汽集团光洋转向装置有限公司， 吉林 长春130011)
  • 收稿日期:2013-12-20 修回日期:2013-12-20 出版日期:2014-10-15 发布日期:2014-05-19
  • 通讯作者: 蒋光炜
  • 作者简介:蒋光炜(1965-)，男，辽宁辽阳人，东北大学博士研究生；邸洪双(1958-)，男，辽宁锦州人，东北大学教授，博士生导师.
  • 基金资助:
    国家重点基础研究发展计划项目(2011CB606306-2).

Effect of Continuous Annealing Process on Microstructure and Properties of B250P Steel

JIANG Guangwei1， WANG Chunliu2， CAO Yu1， DI Hongshuang1   

  1. 1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China； 2. FAW Guangyang Steering Gear Co.， Ltd.， Changchun 130011， China.
  • Received:2013-12-20 Revised:2013-12-20 Online:2014-10-15 Published:2014-05-19
  • Contact: DI Hongshuang
  • About author:-
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摘要： 对含磷高强B250P钢板的连续退火工艺进行了模拟实验，通过光学金相、透射电子显微技术及拉伸实验，研究了连退工艺中加热速度、退火温度、保温时间及冷却速度对B250P钢微观组织及力学性能的影响.结果表明，B250P钢晶粒尺寸随着加热速度的增加、退火温度的升高及冷却速度的增大而增大；随着保温时间的增加，晶粒尺寸呈现出先减小后增大的趋势.退火过程中B250P钢析出相主要为纳米级的NbC和TiC，具有钉扎位错和大角度晶界及细化晶粒的作用.B250P钢的r值随着加热速度的升高而增大，随着冷却速度的增加而减小；提高退火温度和保温时间，r值先增大后减小.

关键词: B250P钢, 连续退火, 晶粒尺寸, 析出物, r值

Abstract: The continuous annealing process of B250P steel was simulated， and the effects of continuous annealing process parameters (heating rate， annealing temperature， holding time and cooling rate) on the microstructure and properties of B250P steel were investigated by using optical microscopy， transmission electron microscopy and tensile test. The results showed that the grain size of B250P steel increases with heating rate， annealing temperature and cooling rate. While the grain size firstly increases and then decreases with increasing the holding time. The dominant precipitates during the annealing process are nanoscale NbC and TiC， which can pin the dislocations and high angle boundaries as well as refine the grains. The rvalue of B250P steel increases with increasing the heating rate and decreases with increasing the cooling rate. The rvalue increases and then decreases with increasing annealing temperature and holding time.

Key words: B250P steel, continuous annealing, grain size, precipitate, rvalue

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