【摘要】 采用物理模拟手段研究了不同变形条件下粉末冶金Fe-6.5wt.%Si高硅钢的热变形行为，并利用金相显微镜(OM)和电子背散射衍射(EBSD)技术分析了合金热变形过程中的组织演化。结果表明：基于Zener-Holloman参数和线性拟合方法建立的本构方程能够很好地预测合金的高温变形行为；基于动态材料模型构建的热加工图能够为合金的热变形提供适宜的工艺窗口；粉末冶金Fe-6.5wt.%Si高硅钢在高温变形时的主要软化机制为动态再结晶和动态回复。变形温度的升高和应变速率的降低有利于合金的再结晶形核和长大。变形后铁素体相形成<100>//ND和<111>//ND丝织构，且随着变形温度升高，<111>//ND织构增强。更多还原

【Abstract】 The hot deformation behavior of a powder metallurgical Fe-6.5wt.%Si high silicon steel under different deformation conditions was investigated by physical simulation, while the microstructure evolution of alloy was analyzed using optical microscopy(OM) and electron backscatter diffraction(EBSD) techniques.The results show that the constitutive equation established based on Zener-Holloman parameter and linear fitting method accurately predicted the high temperature deformation behavior of the alloy.Additionally, a hot processing map constructed using a dynamic material model provided suitable process windows for its thermal deformation.Dynamic recrystallization and dynamic recovery are identified as the primary softening mechanism during high temperature deformation of the high silicon steel, with an increase in nucleation and growth of recrystallization observed at higher deformation temperatures and lower strain rates.After deformation, ferrite phase exhibited <100>//ND and <111>//ND fiber textures, with an enhanced presence of <111>//ND fiber texture as the deformation temperature increased.更多还原