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- W2912165651 abstract "High-pressure torsion (HPT) processing was applied to an Fe-10Ni-7Mn (wt.%) martensitic steel at room temperature and the grain size was reduced from an initial value of ~ 5.5 µm to an ultrafine value of ~ 185 nm for the ferritic phase and around 30 nm for the austenitic phase after 20 HPT turns. The microstructure and mechanical properties of the as-processed material were evaluated using X-ray diffraction (XRD), electron backscatter diffraction (EBSD), field emission scanning electron microscopy (FESEM), microhardness measurements and tensile testing. In addition, annealing of an as-processed specimen was analyzed by differential scanning calorimetry (DSC). The results show that HPT processing increases the hardness and ultimate tensile strength to ~ 690 Hv and ~ 2230 MPa, respectively, but the ductility is decreased from ~ 16.5% initially to ~ 6.4% and ~ 3.1% after 10 and 20 turns, respectively. The hardness distributions and EBSD images show that a reasonably homogeneous microstructure is formed when applying a sufficient level of pressure and torsional strain. The DSC results demonstrate that processing by HPT reduces the start and finish temperatures of the reverse transformation of martensite to austenite and there is continuous re-crystallization after the recovery process." @default.
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- W2912165651 date "2019-03-01" @default.
- W2912165651 modified "2023-10-18" @default.
- W2912165651 title "On the microstructure and mechanical properties of an Fe-10Ni-7Mn martensitic steel processed by high-pressure torsion" @default.
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- W2912165651 doi "https://doi.org/10.1016/j.msea.2019.02.002" @default.
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