The strain-induced boundaries that develop during cold
rolling may also contribute to the strengthening [32]. The straininduced
boundaries are rather strong barriers to slip due to the very
high dislocation density in these boundaries. Therefore, the strengthening
can be related to the increasing dislocation density, taking into account all
dislocations, i.e. intra-granular dislocations and those accumulated in the
strain-induced boundaries. The change in the dislocation density in the
high-Mn austenitic steel during cold rolling has been suggested to obey
the following relationship, Δρ = β(1 – exp(−ε)), where β and ε are a
constant and the true rolling strain, respectively [39]. Therefore, the hardness
of the cold rolled steel can be expressed as
The strain-induced boundaries that develop during coldrolling may also contribute to the strengthening [32]. The straininducedboundaries are rather strong barriers to slip due to the veryhigh dislocation density in these boundaries. Therefore, the strengtheningcan be related to the increasing dislocation density, taking into account alldislocations, i.e. intra-granular dislocations and those accumulated in thestrain-induced boundaries. The change in the dislocation density in thehigh-Mn austenitic steel during cold rolling has been suggested to obeythe following relationship, Δρ = β(1 – exp(−ε)), where β and ε are aconstant and the true rolling strain, respectively [39]. Therefore, the hardnessof the cold rolled steel can be expressed as
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