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使用Thermal-Calc计算了3%Si CGO硅钢的热力学相图,使用DIL805A热膨胀仪测量了实验钢的静态CCT曲线。使用Gleeble 3500进行不同应变速率的热变形实验,并使用OM和EBSD研究了应变速率对两相区变形织构的影响规律。结果表明,在热力学相图中,3%Si的电工钢在1200℃仍处于“奥氏体-铁素体”两相区,在750℃时发生“奥氏体-铁素体”相向“铁素体-珠光体”相转变。根据静态相变点确定3%Si电工钢的热轧是两相区轧制。随应变速率下降,热轧退火晶粒的晶粒尺寸不断变大。应变速率对3%Si CGO两相区变形产生的织构有影响,{111}<110>织构组分随着应变速率的降低先增加后减少。{100}面织构是较强的织构组分。随应变速率降低,旋转立方{100}<011>织构含量较稳定但略有下降。立方{100}<001>取向晶粒在应变速率较高的试样中保持了纤维状分布,在应变速率低的试样中呈现等轴晶状,立方{100}<001>织构在应变速率较高的试样中含量较高。黄铜型取向晶粒在高应变速率条件下数量极少,在低应变速率条件下数量不多但晶粒尺寸较大。
The thermodynamic phase diagram of 3% Si CGO silicon steel was calculated using Thermal-Calc, and the static CCT curve of the experimental steel was measured using DIL805A dilatometer. The Gleeble 3500 was used to conduct the thermal deformation tests at different strain rates. The effect of strain rate on the deformation texture in the two-phase zone was investigated using OM and EBSD. The results show that in the thermodynamic phase diagram, 3% Si electrical steel is still in the “austenite-ferrite” two-phase region at 1200 ℃ and “austenite-ferrite” “Facing ” ferrite - pearlite "phase transition. According to the static transformation point 3% Si electric steel is determined by the hot rolling is two-phase zone rolling. As the strain rate decreases, the grain size of the hot-rolled annealed grains becomes larger and larger. The strain rate affected the textures of the 3% Si CGO in the two-phase region. The texture of {111} <110> first increased and then decreased with the decrease of strain rate. The {100} face texture is a stronger textured component. As the strain rate decreases, the {100} <011> texture content of the rotating cube is stable but decreases slightly. The cubic {100} <001> oriented grains retained a fibrous distribution in the samples with high strain rate and were equiaxed in the samples with low strain rates. The cubic {100} <001> The samples with higher rates are higher in content. Brass-type oriented grains have very few grains at high strain rates, small numbers at low strain rates but larger grain sizes.