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对不同硅含量的低碳贝氏体钢进行轧制,对轧制后的试样进行组织检验和拉伸试验,分析了该钢的显微组织和力学性能。结果表明:Si含量从1.0 wt%增加到1.5 wt%时,试样的微观组织基本相同,均为粒状贝氏体+M/A岛,其屈服强度、抗拉强度略有增加,伸长率基本相同,强度的增加主要来源于Si的固溶强化作用。Si含量从1.5wt%增加到2.0wt%时,该钢的显微组织明显变化,含硅2.0 wt%钢的显微组织为粒状贝氏体+板条马氏体+等轴铁素体,该钢的屈服强度及抗拉强度显著增加,但相比于含Si量1.5wt%的钢,伸长率、强塑积均下降,强度的提高主要是固溶强化、相变强化等的综合作用。比较三种低碳贝氏体钢,若只考虑钢的强度因素,则Si的添加量应达2.0 wt%;若只考虑钢种塑性及强塑积,则Si的添加量应为1.5 wt%。
The low carbon bainitic steels with different silicon contents were rolled. The microstructures and mechanical properties of the samples were analyzed by microstructure and tensile test. The results show that the microstructures of the samples are basically the same when the content of Si is increased from 1.0 wt% to 1.5 wt%, all of them are granular bainite + M / A island, the yield strength and tensile strength increase slightly while the elongation Basically the same, the increase of strength mainly comes from the solid solution strengthening effect of Si. When the content of Si increases from 1.5wt% to 2.0wt%, the microstructure of the steel changes obviously. The microstructure of the steel containing 2.0wt% silicon is granular bainite + lath martensite + equiaxed ferrite, The yield strength and tensile strength of the steel significantly increased, but compared to the steel containing 1.5wt% Si, the elongation and the plastic deformation decreased, and the improvement of the strength was mainly due to the combination of solid solution strengthening and phase transformation strengthening effect. Comparison of three types of low carbon bainitic steel, if only consider the strength of steel, the addition of Si should reach 2.0 wt%; if only consider the plasticity and plasticity of the steel, the addition of Si should be 1.5 wt% .