| Fe-Mn-Al-C lightweight steel is an alloy material with high strength,low density and good strong plasticity.Two high manganese Fe-Mn-Al-C-Nb systems with Nb content of 0.3% and 0.5% were designed and prepared.The lightweight steel of the body is deformed and heat treated by vacuum induction melting furnace.The microstructure,mechanical properties and fracture morphology of the two test steels under hot rolling and solution treatment,cold rolling and annealing are studied.And explored the expansion of the use of niobium alloying for lightweight steel.The hot-rolling and solution treatment of Fe-Mn-Al-C-Nb steel with different Nb content were carried out,and the influence of solution temperature on the microstructure and tensile properties of the test steel was studied.The hot rolling and different solid solution temperatures were investigated.Test the fracture mechanism of steel.After1150°C solution treatment,0.5Nb steel obtained the best strong plasticity,and the strong plastic product reached 50.53GPa·%;the fracture mechanism of the two test steels before and after solution treatment was microporous aggregate fracture.The effects of cold rolling and annealing temperature on the microstructure and mechanical properties of the steel were further studied.After annealing,as the annealing temperature increases,the grain grows gradually,the tensile strength decreases,and the elongation after fracture shows a significant upward trend.The 0.5Nb steel is annealed at 1050°C to obtain the best mechanical properties.It is 986 MPa,the elongation is 51.19%,and the strong plastic product is 50.47GPa·%.The Tafel polarization curves and electrochemical impedance spectroscopy were performed on the two test steels by electrochemical workstation.The results show that the addition of Nb is beneficial to enhance the corrosion resistance of Fe-Mn-Al-C lightweight steel.With the increase of Nb content,the corrosion resistance of the test steel is gradually enhanced.Figure 40;Table 13;Reference 68... |
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