东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (12): 1708-1712.DOI: 10.12068/j.issn.1005-3026.2018.12.007

• 材料与冶金 • 上一篇    下一篇

Nb-V低碳微合金钢等温淬火过程析出行为

李小琳， 邓想涛， 李艳梅， 王昭东   

  1. (东北大学 轧制自动化及连轧国家重点实验室， 辽宁 沈阳110819)
  • 收稿日期:2017-09-23 修回日期:2017-09-23 出版日期:2018-12-15 发布日期:2018-12-19
  • 通讯作者: 李小琳
  • 作者简介:李小琳(1990-)，女，陕西西安人，东北大学博士研究生; 王昭东(1968-)，男，安徽怀宁人，东北大学教授，博士生导师.冯明杰(1971-)， 男， 河南禹州人， 东北大学副教授; 王恩刚(1962-)， 男， 辽宁沈阳人， 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(51171041).国家重点研发计划项目(2017YFB0305300).

Carbide Precipitation in Ferrite in Nb-V-Bearing Low-carbon Steel During Isothermal Quenching Process

LI Xiao-lin， DENG Xiang-tao， LI Yan-mei， WANG Zhao-dong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2017-09-23 Revised:2017-09-23 Online:2018-12-15 Published:2018-12-19
  • Contact: LI Yan-mei
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摘要： 利用透射电镜和纳米压痕仪对Nb-V低碳微合金钢中纳米碳化物的析出行为进行研究.研究结果表明，在700℃等温60min试样中，可同时观察到相间析出和弥散析出，在其余试样中均未观察到相间析出，此规律可以通过相变过程中的扩散准则和台阶机制来解释.另外，纳米压痕结果显示在600℃等温20min试样中，平均硬度为3.87GPa，650℃等温20min试样中，平均硬度为4.10GPa，且通过TEM观察可以看出，650℃等温20min中试样析出物数量密度较大且分布均匀.利用Ashby-Orowan机制对析出强化量进行计算，可以得出在650℃等温20min试样中，析出强化对整个屈服强度的贡献量可以达到110MPa.

关键词: 微合金高强度钢, 相间析出, 弥散析出, 纳米压痕

Abstract: Precipitation behavior of carbides in Nb-V HSLA steel during isothermal quenching process and its strengthening effect were studied using TEM and nanoindentation tests. The results indicated that interphase precipitations and dispersed precipitations could occur simultaneously in the specimen treated at 700℃ for 60min， while in other specimens， only random precipitations were observed. This phenomenon can be explained by mass balance criterion and ledge mechanism during diffusional phase transformation. It was also found that the average hardness of the specimen held at 600℃ for 20min was 3.87GPa and was 4.10GPa at 650℃ for 20min. Moreover， the TEM results illustrated that carbide precipitations in the specimen holding at 650℃ for 20min were dispersed more uniformly and the volume fraction of the precipitations was greater than that treated at 600℃ for 20min. The strengthening contributed by the precipitations was 110MPa in the specimen treated at 650℃ for 20min， evaluated by the Ashby-Orowan mechanism.

Key words: HSLA steel, interphase precipitation, dispersed precipitation, nanoindentation

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