Hot Deformation Behavior and Microstructure Evolution of Power Metallurgical Fe-6.5wt.%Si High Silicon Steel
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.
powder metallurgy Fe-6.5wt.%si high silicon steelhot deformationconstitutive equationmicrostructure evolution
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