| The lightweight of steel has great development prospects in the fields of automobiles,ships,aerospace,etc.,and the light weight of steel is mainly from two aspects.On the one hand,it is to improve the strength of steel,and to ensure its original safety and practicality.on the other hand,the density of the steel is reduced,that is,the metal element having a small atomic mass is added to the steel to achieve weight reduction while ensuring the performance of the alloy steel is constant or even improved.Fe-Mn-Al-C with different Al content was melted by vacuum induction furnace,and its deformation and heat treatment were carried out.The changes of microstructure,mechanical properties,fracture morphology and corrosion resistance of the two test steels under different processes were studied.On the basis of the forged steel,the two Fe-Mn-Al-C steels were hot rolled and solution treated,and the microstructure and mechanical properties of the test steel after hot deformation and heat treatment were tested and analyzed.The fracture test results of the test steel were used to investigate the fracture mechanism of the test steel after hot rolling and solution treatment.The results show that the microstructure of the test steel after hot rolling treatment is obviously refined.After the solution treatment,the microstructure of the test steel grows,and the austenite content increases and the ferrite content decreases.After hot rolling,the strong plastic product of Fe-28Mn-10Al-C steel is 44.53 GPa,the strong plastic product of Fe-28Mn-5Al-C steel is 34.974GPa;the strong plastic product of the two test steels after solution treatment is increased to 51.9554 GPa and 43.9241 GPa respectively;The fracture mechanism is microporous aggregate fracture;the solution treatment causes the austenite structure to grow,reduces the ferrite content,and improves the mechanical properties of the steel.The cold-rolled and annealed test steel was hot-rolled,and the effects of cold rolling and annealing on the microstructure and mechanical properties of the steel were further studied.The results show that the ferrite in the Fe-28Mn-10Al-C steel increases after cold rolling deformation and is distributed in a discontinuous band shape along the rolling direction.After annealing,the austenite in the steel is refined,The ferrite structure in Fe-28Mn-10Al-C steel grows laterally and diffusely,and Fe-28Mn-5Al-C steel is austenitic structure.It is believed that the main factor affecting the strength increase and plasticity reduction of test steel after cold rolling and annealing treatment is the content and volume of ferrite in steel.The corrosion resistance of the two test steels under different treatments was analyzed by Tafel polarization curve and Nyquist map.The results show that Fe-28Mn-10Al-C steel under different treatment processes The corrosion resistance is better than that of Fe-28Mn-5Al-C steel.With the increase of Al content,the corrosion resistance of Fe-Mn-Al-C lightweight steel is gradually enhanced.By comparing the corrosion resistance of 10 Al steel under different treatments,it is concluded that the corrosion resistance of 10 Al steel after solution treatment is the best,while the corrosion resistance of 10 Al steel after cold rolling treatment is the worst.Figure48;Table12;Reference 61... |
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