Tensile behavior of an equiaxed-grained Fe-6.5 wt.%Si alloy, which was deformed into Φ6 mm bar by hot rotary swaging, was investigated at various temperatures (300–400 °C) and stretching rates (0.42–1 mm/min). The results revealed an enhancement in the intermediate-temperature tensile ductility after heat treatments. Deformation twinning was found in the equiaxed-grained Fe-6.5 wt.%Si bars during the tensile test, and heat treatments can enhance the deformation twinning. More twins can be observed in the necking areas than other regions. The high Schmid factor values above 0.4 after heat treatments demonstrated that deformation twinning can easily occur in the equiaxed-grained Fe-6.5 wt.%Si alloy. Higher deformation temperatures, higher strain rates, and larger degree of order suppressed the formation of deformation twinning, while the grain sizes had little effect on the deformation twinning. The twinning stress of the Fe-6.5 wt.%Si alloy increased with the increasing grain size, which did not agree with the Hall–Petch type relationship. The deformation twinning resulted in the improved ductility of the Fe-6.5 wt.%Si alloy.

等轴晶Fe-6.5 wt。％Si合金的拉伸行为，该合金变形为Φ在各种温度（300–400°C）和拉伸速率（0.42–1 mm / min）下，通过热旋转模锻研究了6 mm bar。结果表明，热处理后中温拉伸延展性提高。在拉伸试验期间，等轴晶化的Fe-6.5 wt。％Si钢筋中发现变形孪晶，热处理可以增强变形孪晶。在颈缩区域可以看到比其他区域更多的双胞胎。热处理后高于0.4的高Schmid因子值表明，等轴晶化Fe-6.5 wt。％Si合金中容易发生形变孪晶。较高的变形温度，较高的应变速率和较大的有序度抑制了变形孪生的形成，而晶粒尺寸对变形孪生的影响很小。Fe-6.5 wt。的孪晶应力 Si合金含量随晶粒尺寸的增加而增加，这与Hall-Petch类型的关系不一致。变形孪晶导致Fe-6.5重量％Si合金的延展性提高。