A substantial improvement of tensile properties through microstructure engineering in a high Ni-0.2C TRIP steel under severe plastic deformation

In the present paper, microstructural evolution and mechanical properties changes of an ultrafine-grains (UFGs) Fe-24Ni-0.2C steel processed via accumulative roll bonding (ARB) is investigated. Characterization of microstructure with Electron Backscatter Diffraction (EBSD) technique revealed that a substantial grain refinement happened after 6-cycle ARB process. As well, elongated UFGs austenite with mean grain size smaller than 200 nm was...