采用光学显微镜表征了双相钢中不同马氏体体积分数情况下的组织特征，观察结果表明：低马氏体体积分数情况下，马氏体完全呈岛状或者颗粒状；随着马氏体体积分数的增加，组织中出现光学可见的板条马氏体，但颗粒状马氏体岛数量减少；当马氏体体积分数进一步增加，板条马氏体成为主导相，颗粒状马氏体岛几乎消失。结合热力学分析可知，马氏体量增加导致马氏体内部C、Mn含量的减少，这是马氏体形态变化的可能原因之一。
The microstructure characteristics of dual phase steels with different martensite volume fraction (MVF) were investigated by optical microscope. The results observed show that martensite shape is island or granular in the case of low MVF. With the increase of MVF, the optical visible lath martensite appears in the microstructure, but the granular martensite islands decrease. When further increasing the MVF, the lath martensite becomes the dominant phase, whereas the granular martensite islands have almost disappeared. Combined with thermodynamic analysis, the reduction of C and Mn contents in martensite due to the increase of MVF is one of the possible reasons for the changing of martensite morphology.
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