The grain size dependence of the tensile properties of a TWIP steel has been determined for a wide range of grain sizes obtained by grain growth after complete recrystallization of cold rolled material. The near-linear stress-strain behaviour typical of either TWIP steels or other materials that deform by twinning has been observed, the work hardening rate being larger for the smaller grain sizes. The Hall-Petch slope increases as a function of strain, from 350 MPa μm~(1/2) for the yield stress to 630 MPa μm~(1/2) for the maximum uniform strain in the tensile tests, ε ≌ 0.40. Profuse twinning is observed in deformed specimens by means of FIB-ISE.
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