Abstract
The strain hardening behavior and microstructure evolution of a newly developed Cr–Nb alloyed high manganese steel were investigated in the present study. The investigated steel demonstrated good combination of yield strength (425.6 MPa) and impact toughness (372.5 J/cm2) after solution treatment. Room temperature compression test was conducted to investigate the strain hardening behavior during the practical performance condition. The investigated steel exhibited a long continuous strain hardening stage. The ultimate true stress could be higher than 5000 MPa. No obvious phase transformation was activated during the deformation process. The deformation behavior was dominated by planar dislocation slip, dislocation walls, formation of mechanical twinning and inhabitation of nano size NbC carbide precipitations. The formation of mechanical twinning and dislocation cell played a dyanamic grain refinement effect, which contributed to the upward trend of the strain hardening rate. Precipitation strengthening would also help improving the strain hardening rate.
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