Mechanical properties of fine-grained dual phase low-carbon steels based on dynamic transformation

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-10-01 DOI:10.1016/S1005-8850(08)60104-8

Haiwei Xu , Wangyue Yang , Zuqing Sun

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引用次数: 8

Abstract

The fine grained dual phase (FG-DP) steel with ferrite grains of 2-4.5 μm and martensite islands smaller than 3 μm was obtained through the mechanism of deformation-enhanced ferrite transformation (DEFT). Mechanical properties of the steel were tested at room temperature. The results indicated that with a similar volume fraction of martensite (about 20vol%), FG-DP steel exhibited a superior combination of higher strength and more rapid strain hardening at low strains compared with the coarse-grained dual phase (CG-DP) steel obtained by critical annealing. The combination of higher strength, large elongation, and more rapid strain hardening of FG-DP steel can be attributed to the fine ferrite grain and finely dispersed martensite islands. In addition, the uniformly distributed martensite islands in FG-DP steel have smaller interspacing compared with that of CG-DP steel. So, at the initial plastic deformation stage, the plastic deformation of ferrite was restrained and more pronounced load was transferred from ferrite to martensite. The plastic deformation of martensite in FG-DP steel started earlier.

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基于动态转变的细晶双相低碳钢力学性能研究

通过形变增强铁素体相变(DEFT)机制，获得铁素体晶粒为2 ~ 4.5 μm、马氏体岛小于3 μm的细晶双相钢(FG-DP)。在室温下测试了该钢的力学性能。结果表明，在马氏体体积分数相近(约20vol%)的情况下，FG-DP钢与经临界退火的粗晶双相(CG-DP)钢相比，具有更高的强度和更快速的应变硬化。FG-DP钢具有较高的强度、较大的伸长率和更快的应变硬化，这可归因于铁素体晶粒细，马氏体岛分布细。与CG-DP钢相比，FG-DP钢中均匀分布的马氏体岛间距更小。因此，在初始塑性变形阶段，铁素体的塑性变形受到抑制，载荷从铁素体向马氏体的转移更为明显。FG-DP钢的马氏体塑性变形开始较早。

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Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

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