The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction,X-ray diffraction and tensile tests.The results sh...The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction,X-ray diffraction and tensile tests.The results show that the austenite phases are mainly distributed on the grain boundary in the duplex microstructure of austenite and ferrite,and it is easy for the big-size austenite to transform at small beginning tension strain following the mechanisms of both austenite (fcc)→ε- martensite (hcp)→α-martensite (bcc)and austenite (fcc)→α-martensite (bcc).Both yield strength and tensile strength increase with the increase in pre-strain,and the total elongation decreases,while the value of pre-strain plus total elongation almost keeps constant.During tensile deformation,transformation from austenite into martensite improves work-hardening rate remarkably.展开更多
Medium manganese austenitic steel (MMAS) fabricated through the hot rolling process has been used in the mining,military,and mechanical industries.In this paper,the abrasion performance and hardening mechanism were me...Medium manganese austenitic steel (MMAS) fabricated through the hot rolling process has been used in the mining,military,and mechanical industries.In this paper,the abrasion performance and hardening mechanism were measured under a series of impact energies.The impact wear was tested at different impact energies from 0.5 J to 6 J using a dynamic load abrasive wear tester (MLD-10).Microstructure and surface morphologies were analyzed using scanning electron microscopy,X-Ray diffraction,and transmission electron microscopy.The results suggest that MMSA has the best wear resistance at 3.5 J and the worst wear resistance at 1.5 J.Furthermore,the wear mechanism and worn surface microstructure change with different impact energies.There are small differences between a large amount of martensite on the worn surfaces under different impact energies and the shapes of dislocation and twins change with different impact energies.展开更多
文摘The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction,X-ray diffraction and tensile tests.The results show that the austenite phases are mainly distributed on the grain boundary in the duplex microstructure of austenite and ferrite,and it is easy for the big-size austenite to transform at small beginning tension strain following the mechanisms of both austenite (fcc)→ε- martensite (hcp)→α-martensite (bcc)and austenite (fcc)→α-martensite (bcc).Both yield strength and tensile strength increase with the increase in pre-strain,and the total elongation decreases,while the value of pre-strain plus total elongation almost keeps constant.During tensile deformation,transformation from austenite into martensite improves work-hardening rate remarkably.
文摘Medium manganese austenitic steel (MMAS) fabricated through the hot rolling process has been used in the mining,military,and mechanical industries.In this paper,the abrasion performance and hardening mechanism were measured under a series of impact energies.The impact wear was tested at different impact energies from 0.5 J to 6 J using a dynamic load abrasive wear tester (MLD-10).Microstructure and surface morphologies were analyzed using scanning electron microscopy,X-Ray diffraction,and transmission electron microscopy.The results suggest that MMSA has the best wear resistance at 3.5 J and the worst wear resistance at 1.5 J.Furthermore,the wear mechanism and worn surface microstructure change with different impact energies.There are small differences between a large amount of martensite on the worn surfaces under different impact energies and the shapes of dislocation and twins change with different impact energies.
