以低碳Mn-Cr冷轧热镀锌双相钢为对象,研究了两相区不同加热温度下钢的组织特征和力学性能。结果表明,钢的组织由铁素体和马氏体岛组成,马氏体岛在铁素体基体上均匀弥散分布,马氏体岛中有微孪晶存在,且在靠近马氏体岛相界的铁素体中存在非连续的(Fe,Cr,Mn)xCy析出物。随加热温度的升高,钢的屈服强度和伸长率明显升高,抗拉强度下降。 Taking low-carbon Mn-Cr cold-rolled hot-dip galvanized dual-phase steel as an example, the microstructure and mechanical properties of the steel under different heating temperatures in two-phase region were studied. The results show that the microstructure of the steel is composed of ferrite and martensite islands, the martensite islands are uniformly dispersed on the ferrite matrix, the micro-twins exist in the martensite islands, and near the martensite island phase Discontinuous (Fe, Cr, Mn) xCy precipitates exist in the boundary ferrite. With the increase of heating temperature, the yield strength and elongation of steel obviously increased, and the tensile strength decreased.