Abstract：The dual phase steel has excellent mechanical property, and the content of martensite/ferrite has important influence on its property. The dual phase steel samples with different volume fractions of martensite were prepared by adjusting the quenching temperature. The morphology and distribution of martensite/ferrite structures were qualitatively observed by metallographic microscope. The electron backscatter diffraction (EBSD) technique and Gaussian fitting showed that the diffraction pattern contrast of martensite/ferrite had bimodal distribution. Based on this, the quantitative statistics of volume fraction of martensite in steel was conducted. The results showed that the volume fraction of martensite was only 19.09% when the quenching temperature was 730℃. The content of martensite in dual phase steel increased with the increase of quenching temperature. When the quenching temperature was 790℃, the volume fraction of martensite was up to 30.96%, which increased by 62%. Moreover, the mechanical properties of dual phase steel samples were compared. The analysis results indicated that the tensile strength of dual phase steel was improved significantly with the increase of quenching temperature. Meanwhile, the yield strength also showed increasing trend. It was mainly related to the increase of martensite content in steel. On the other hand, the elongation rate of dual phase steel decreased greatly, which was mainly caused by the decrease of ferrite content as well as the morphology change from needle-like (which was advantageous to deformation) to polygonal.
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