Effects of intercritical annealing temperature on the microstructure and mechanical properties of hot rolled 0.2C-8Mn-2Al steel were studied by using scanning electron microscope(SEM)and tensile testing.The results show that microstructure of the annealed 0.2C-8Mn-2Al steel is mainly composed of austenite and ferrite.In the range of 780 ℃ to 900 ℃,with the increase of annealing temperature,the volume fraction of austenite transformation in the 0.2C-8Mn-2Al steel before and after stretching gradually increases.Meanwhile,the tensile strength,elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel first increase and then decrease.The austenite transformation volume fraction of the 0.2C-8Mn-2Al steel annealed at 900 ℃ is the highest,reaching 43.4％.The tensile strength,elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel annealed at 840℃reach maximum values,which are 1208.6 MPa,31.2％and 37.71 GPa·％,respectively.840 ℃ is the optimal annealing temperature for the hot rolled 0.2C-8Mn-2Al steel.
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