Effect of thermo-mechanical controlled processing deformation on microstructures and tensile properties of Fe-25Mn-8Al-5Ni-1.2C steel
The effects of different deformation in thermo-mechanical controlled processing(TMCP)combined the solid solution at 1 050 ℃ with hot rolling on the microstructure and mechanical properties of Fe-25Mn-8Al-5Ni-1.2C low-density steels aged at 450 ℃ were studied by OM,SEM,TEM characterization and other experimental methods.The results show that after TMCP with different rolling reductions and aging,all the tested steels show single-phase austenite grains.With the deformation increasing from 20％to 60％,the grains are refined effectively and the average grain size decreases from 75μm to 14 μm,the precipitation and size of B2 increase;the number of the relatively large κ carbides are reduced while the smaller are increased,and its distribution gradually became homogenized.Compared with the undeformed aged steel,the yield strength of the aged steels after TMCP increases by 45％-72％d ue to the combination of grain refinement strengthening,dislocation strengthening and precipitation strengthening.Meanwhile,the strain hardening ability is improved with the deformation increasing.
NETL
NSTL
万方数据
维普
