Haiwei Xu, Wangyue Yang, and Zuqing Sun, Mechanical properties of fine-grained dual phase low-carbon steels based on dynamic transformation, J. Univ. Sci. Technol. Beijing, 15(2008), No. 5, pp. 556-560. https://doi.org/10.1016/S1005-8850(08)60104-8
Cite this article as:
Haiwei Xu, Wangyue Yang, and Zuqing Sun, Mechanical properties of fine-grained dual phase low-carbon steels based on dynamic transformation, J. Univ. Sci. Technol. Beijing, 15(2008), No. 5, pp. 556-560. https://doi.org/10.1016/S1005-8850(08)60104-8
Haiwei Xu, Wangyue Yang, and Zuqing Sun, Mechanical properties of fine-grained dual phase low-carbon steels based on dynamic transformation, J. Univ. Sci. Technol. Beijing, 15(2008), No. 5, pp. 556-560. https://doi.org/10.1016/S1005-8850(08)60104-8
Citation:
Haiwei Xu, Wangyue Yang, and Zuqing Sun, Mechanical properties of fine-grained dual phase low-carbon steels based on dynamic transformation, J. Univ. Sci. Technol. Beijing, 15(2008), No. 5, pp. 556-560. https://doi.org/10.1016/S1005-8850(08)60104-8
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.
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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