The effects of solution treatment at different temperatures on the microstructure and mechanical properties of hot rolled Fe-6Al-4Mn-0.6C light steel were studied by OM,TEM,XRD,tensile test and fracture observation.The results show that the microstructure of hot rolled Fe-6Al-4Mn-0.6C steel consists of ferrite and a large amount of fine type κ carbides.The microstructure of hot rolled Fe-6Al-4Mn-0.6C steel after solution at 920℃is ferrite,martensite,residual austenite and a small amount of type κ carbides.When the solution temperature reaches 980℃,the κ carbides in Fe-6Al-4Mn-0.6C steel disappear.Compared with that of the hot rolled test steel,the strength of Fe-6Al-4Mn-0.6C steel in solution state is decreased.Fe-6Al-4Mn-0.6C steel solution treated at 920℃has the lowest tensile strength and yield strength of 1012.3 MPa and 824.6 MPa respectively,and the elongation and strong plastic product are the highest,which are 1.5%and 1518.45 MPa·%respectively.
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