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对3种成分Fe-Mn-Si-Al钢的力学性能、显微结构和重位晶界进行了研究,结果表明:随着钢中Mn、Si和Al元素含量的降低,材料的屈服强度和抗拉强度逐渐升高,伸长率逐渐降低,低∑值重位晶界出现频率依次为83.4%、36%和21%,并且钢中形变孪晶的数量逐渐减少。Fe-30Mn-3Si-3Al钢中形变孪晶分为一次孪晶和二次孪晶,一次孪晶和二次孪晶生长方向成60°夹角,大部分二次孪晶分布在一次孪晶的两孪晶界之间,但在高应力的形变带内二次孪晶可穿过一次孪晶的孪晶界。
The mechanical properties, microstructure and re-occluded grain boundaries of three Fe-Mn-Si-Al steels were studied. The results show that with the decrease of Mn, Si and Al contents in the steel, the yield strength and The tensile strength gradually increased and the elongation decreased gradually. The frequency of low Σ value repositioned grain boundaries was 83.4%, 36% and 21%, respectively, and the number of deformation twins in steel gradually decreased. The deformation twins in Fe-30Mn-3Si-3Al steel are divided into primary twins and secondary twins. The primary and secondary twins grow at an angle of 60 °, and most of the secondary twins are distributed in one twins Of the twin boundaries between the two, but in the high-strain zone of secondary twins can be twins through the twin boundaries.