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Tensile properties and strengthening mechanisms of a TWIP steel at high strain rate: Hall-Petch relationship. The influence of strain rate and grain size on the mechanical properties of a 22% Mn, 0.6% C (mass %) austenitic TWIP steel has been studied. A typical quasi-linear stress-strain behaviour of TWIP steels that deform by twinning has been observed at strain rates of 9.4 s −1 and 265 s −1 and room temperature. At high strain rates, the constant work - hardening rate region typically observed in TWIP steel clearly shortens. In addi- tion, the Hall-Petch relationship has been obtained for each strain rate. The Hall-Petch slope KHP increases as a function of strain in all cases. The dependence of the KHP on the strain rate could be adiabatic heating.

Propiedades mecánicas a tracción y mecanismos de endurecimiento de un acero TWIP a altas velocidades de deformación: relación de Hall-Petch