Hot Deformation Behavior and Processing Map of Novel Fe-Cr Alloy Containing Aluminum
The compression test was conducted on Fe-18Ni-12Cr-3Al alloy by Gleeble-3500 thermal simulator in tem-perature range of 925～1 175℃and strain of 0.01～10 s-1.The true stress-strain curve was analyzed,and the constitu-tive equation as well as thermal processing map was established.The critical conditions of dynamic recrystallization were investigated by inflection point method based on θ-σ curve.The results indicate that the flow stress of Fe-18Ni-12Cr-3Al alloy is increased significantly with increasing in strain rate and decreasing in deformation temperature.There exits a correlation between the critical stress and peak stress for dynamic recrystallization of the alloy,which is σc= 0.95σp.According to the constitutive equation and thermal processing map,the activation energy is 376.1 kJ/mol,and the optimal processing domain are determined in temperature range of 1 110～1 160℃and strain of 0.01～1 s-1.
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