Effect of different temperatures annealing in the two-phase region on the microstructure and mechanical properties of Fe-0.12C-4.85Mn-0.24Si steel was studied using scanning electron microscopy,universal testing machine,X-ray diffraction instrument.The results show that with the increase of annealing temperature,the grain size of the Fe-0.12C-4.85Mn-0.24Si steel gradually increases,carbides gradually dissolve,and the volume fraction of austenite in the microstructure first increases and then decreases.The Fe-0.12C-4.85Mn-0.24Si steel annealed at 640 ℃ has the highest austenite volume fraction of 22.1％.As the annealing temperature increases,the tensile strength of the Fe-0.12C-4.85Mn-0.24Si steel gradually increases,and the product of elongation and strength first increases and then decreases.The elongation and product of strength and elongation of the Fe-0.12C-4.85Mn-0.24Si steel annealed at 640℃are the highest,which are 30.4％and 28.47 GPa·％,respectively.
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