东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2015, Vol. 36 ›› Issue (1): 24-28.DOI: 10.12068/j.issn.1005-3026.2015.01.006

• 材料与冶金 • 上一篇    下一篇

低碳Si-Mn钢直接淬火-等温配分工艺中组织演变

康健， 袁国， 张贺， 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:2013-12-01 修回日期:2013-12-01 出版日期:2015-01-15 发布日期:2014-11-07
  • 通讯作者: 康健
  • 作者简介:康健(1982-)，男，辽宁沈阳人，东北大学博士后研究人员; 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:
    国家科技支撑计划项目(2012BAF04B01); 中央高校基本科研业务费专项资金资助项目(N130407001); 辽宁省自然科学基金资助项目(2014020027).

Microstructure Evolution of Low Carbon Si-Mn Steel During Direct Quenching and Isothermal Partitioning

KANG Jian， YUAN Guo， ZHANG He， WANG Guo-dong   

  1. State Key Laboratory of Rolling and Automation， Northeastern University， Shenyang 110819， China.
  • Received:2013-12-01 Revised:2013-12-01 Online:2015-01-15 Published:2014-11-07
  • Contact: KANG Jian
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摘要： 以低碳Si-Mn钢为研究对象，在传统淬火-配分工艺中引入压缩变形，研究了压缩变形对组织演变的影响以及实验钢在不同等温配分条件下的显微结构特征.结果表明，引入高温变形处理后，试样具有更加精细的显微结构，同时显微组织中含有较高比例的大角度晶界，由无变形条件下的65.7%提高至72.5%;在相变及碳配分过程中，晶界以及板条边界附近易形成碳富集区;随配分时间延长，显微组织呈回火转变趋势，当配分时间延长至1500s时，组织中出现较大量的碳化物析出相，残余奥氏体体积分数降低至7.9%.

关键词: 低碳Si-Mn钢, 压缩变形, 直接淬火, 配分, 显微组织

Abstract: Compression deformation was introduced into the conventional quenching and partitioning process for low carbon Si-Mn steel.Effects of the hot deformation on microstructure evolution and microstructure characteristics of specimens treated by various isothermal partitioning processes were investigated. The results showed that the microstructure is refined and the fraction of high-angle grain boundary increases from 65.7% to 72.5% due to the hot deformation. Carbon-rich areas formed during transformation and partitioning process are mostly observed at the boundaries of prior austenite grains and martensite laths. With the increase of the partitioning time，the microstructure shows a tendency to tempering transformation. When the partitioning time is up to 1500s， a great number of carbides are formed and the volume fraction of retained austenite decreases to 7.9%.

Key words: low carbon Si-Mn steel, compression deformation, direct quenching, partitioning;microstructure

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