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- W3187019744 abstract "A Fe-25Mn-3Si-3Al TWIP steel was modified by the additions of 0. 35% Nb and 0. 1% C,and then an appropriate heat treatment process was used to improve its yield strength. The results show that the yield strength of Fe-25Mn-3Si-3Al TWIP steel increases from 320 MPa to 445 MPa,but the uniform elongation of the modified steel decreases from 65% to 55% after the modification. The addition of Nb can strongly hinder the growth of austenitic grains,and refines the recrystallized grain size of the high-Mn TWIP steel,moreover,Nb atoms combine with C atoms to form the nanoscale Nb C precipitated phase,and these nanoscale precipitated particles are dispersively distributed in austenitic matrix,which can prevent the dislocation movement and improve the yield strength of the high-Mn TWIP steel by the Orowan mechanism. Furthermore,the additions of Nb and C elements can not obviously change the deformation mechanism of Fe-25Mn-3Si-3Al steel at room temperature,and the strain-induced twinning is still a main deformation mechanism for the modified Fe-25Mn-3Si-3Al-0. 3Nb-0. 1C steel. The stacking fault energy of Fe-25Mn-3Si-3Al-0. 3Nb-0. 1C steel still remains a low level.And finally, the yield strength and tensile strength of Fe-25Mn-3Si-3Al steel are significantly improved by grain refinement and precipitation strengthening,and the twinning induced plasticity effect of the austenitic matrix provides a satisfactory ductility for the modified steel." @default.
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- W3187019744 date "2015-01-01" @default.
- W3187019744 modified "2023-09-28" @default.
- W3187019744 title "Microstructure and mechanical properties of Nb micro-alloyed Fe-25Mn-3Si-3Al TWIP steel" @default.
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