东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2008, Vol. 29 ›› Issue (11): 1576-1580.DOI: -

• 论著 • 上一篇    下一篇

高扩孔钢变形奥氏体的连续冷却转变

蔡明晖;丁桦;李晓滨;唐正友;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-22 修回日期:2013-06-22 出版日期:2008-11-15 发布日期:2013-06-22
  • 通讯作者: Cai, M.-H.
  • 作者简介:-
  • 基金资助:
    国家自然科学基金资助项目(50527402)

Continuous cooling transformation of deformed austenite in highly hole-expandable steels

Cai, Ming-Hui (1); Ding, Hua (1); Li, Xiao-Bin (1); Tang, Zheng-You (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
  • Received:2013-06-22 Revised:2013-06-22 Online:2008-11-15 Published:2013-06-22
  • Contact: Cai, M.-H.
  • About author:-
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摘要： 研究了三种硅—锰系低碳钢变形奥氏体的连续冷却转变,分析了w(Si),w(Mn)对相变温度Ar3、转变组织及力学性能的影响.实验结果表明:w(Si)由0.50%增加到1.35%时,Ar3升高15~25℃,而w(Mn)由0.97%增加到1.43%时,Ar3降低30~50℃,锰对Ar3的影响效果强于硅;硅促进了高温等轴铁素体析出,抑制了贝氏体相变,而锰不仅细化了相变组织,还促进了贝氏体形成;w(Si),w(Mn)分别为0.56%和1.43%的钢在850℃变形后以30℃/s冷却,获得均匀、微细化的铁素体/贝氏体双相组织,抗拉强度可达到654 MPa.

关键词: 铁素体/贝氏体双相钢, 变形奥氏体, 硅含质量分数, 锰质量分数, 相变温度

Abstract: The effects of Si and Mn contents on transformation temperature Ar3, transformed microstructure and mechanical properties of three kinds of low-carbon steels during continuous cooling were investigated. Ar3 rises by 15-25°C when increasing Si content from 0.50% to 1.35%, and it drops by 30-50°C when increasing Mn content from 0.97% to 1.43%. The effect of Mn on Ar3 is more significant than Si. Si stimulates the precipitation of the high-temperature equiaxed ferrite to suppress the bainite transformation, but Mn not only provides the grain refining of transformed microstructure but also stimulates the forming of bainite. The homogeneous and grain refining diphase ferrite/bainite steel (w(Si)=0.56, w(Mn)=1.43) can be obtained after deformed at 850°C and cooled at the rate 30°C/s, of which the tensile strength is up to 654 MPa.

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