东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (1): 36-41.DOI: 10.12068/j.issn.1005-3026.2017.01.008

• 材料与冶金 • 上一篇    下一篇

低碳Si-Mn系DQ&P钢组织演变模拟研究

李云杰, 康健, 袁国, 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:2016-01-18 修回日期:2016-01-18 出版日期:2017-01-15 发布日期:2017-01-13
  • 通讯作者: 李云杰
  • 作者简介:李云杰(1991-),男,四川宜宾人,东北大学博士研究生; 袁国(1979-),男,山东泰安人,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:
    国家自然科学基金青年基金资助项目(51504063); 辽宁省自然科学基金资助项目(2014020027); 中央高校基本科研业务费专项资金资助项目(N130407001).

Simulation Study on Microstructure Evolution of Low Carbon Si-Mn Steel During Direct Quenching and Partitioning

LI Yun-jie, KANG Jian, YUAN Guo, WANG Guo-dong   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.
  • Received:2016-01-18 Revised:2016-01-18 Online:2017-01-15 Published:2017-01-13
  • Contact: YUAN Guo
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摘要: 以低碳Si-Mn钢为研究对象,采用直接淬火-配分工艺,研究了不同变形温度和配分时间对组织演变行为的影响.结果表明,Q&P钢典型组织由马氏体、铁素体和少量残余奥氏体组成.其中马氏体呈现板条马氏体、孪晶马氏体等特征.随着配分时间的延长,显微组织呈现回火转变趋势.当变形温度为950℃和880℃时,残余奥氏体体积分数先增加后减少,均在配分150s时达到最大值,分别为9.1%,10.1%.当变形温度在820℃时,由于先共析铁素体的存在易于获得较多的残余奥氏体,体积分数高达11.9%,并且残余奥氏体中平均碳含量相对较低.

关键词: 低碳Si-Mn钢, 直接淬火, 变形温度, 配分时间, 残余奥氏体

Abstract: Effects of deformation temperature and partitioning time on microstructure evolution of low carbon Si-Mn steel during direct quenching-partitioning process were investigated. The volume fraction of retained austenite and the carbon concentration in retained austenite were quantitatively studied. The results showed that the typical microstructure of Q&P steel consists of a small amount of retained austenite, ferrite and martensite containing lath martensite and twin martensite. With increase of the partitioning time, the microstructure shows a tempered transformation tendency. When deformation temperature is 950℃and 880℃, the volume fraction of retained austenite decreases after the first increase and reaches the maximum, 9.1%, 10.1%, respectively at the partitioning time of 150s. When deformation temperature is 820℃, the volume fraction of retained austenite increases up to 11.9% because of proeutectoid ferrite. And the carbon concentration in austenite is relatively lower.

Key words: low carbon Si-Mn steel, direct quenching, deformation temperature, partitioning time, retained austenite

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