The effect of cold rolling strain on strengthening of the Fe–17Mn–
1.5Al–0.3C TWIP steel is shown in Fig. 1. In the initial condition, the present
steel is characterized by an outstanding ability to work harden. Cold
rolling to a total strain of 0.2 results in rapid increase in the hardness
from 1510 to 3700 MPa. Upon further cold rolling, the rate of strain hardening
gradually decreases. This is a common deformation behavior during
large strain cold working, when the strain hardening capacity decreases
to almost zero at large strains [31–34]. In contrast to other studies on metallic
materials subjected to severe deformation, however, the present
steel exhibits remarkable hardening even in the ranger of large strains
of 2 to 3, leading to the hardness of up to 5600 MPa during cold rolling
to a total strain of 3.0. The strengthening by cold working is frequently
attributed to an increase in dislocation density (Δρ), ΔHv = αGbΔρ0.5,
where α is a constant, G is the shear modulus and b is the Burgers vector
[28,35–38].
The effect of cold rolling strain on strengthening of the Fe–17Mn–1.5Al–0.3C TWIP steel is shown in Fig. 1. In the initial condition, the presentsteel is characterized by an outstanding ability to work harden. Coldrolling to a total strain of 0.2 results in rapid increase in the hardnessfrom 1510 to 3700 MPa. Upon further cold rolling, the rate of strain hardeninggradually decreases. This is a common deformation behavior duringlarge strain cold working, when the strain hardening capacity decreasesto almost zero at large strains [31–34]. In contrast to other studies on metallicmaterials subjected to severe deformation, however, the presentsteel exhibits remarkable hardening even in the ranger of large strainsof 2 to 3, leading to the hardness of up to 5600 MPa during cold rollingto a total strain of 3.0. The strengthening by cold working is frequentlyattributed to an increase in dislocation density (Δρ), ΔHv = αGbΔρ0.5,where α is a constant, G is the shear modulus and b is the Burgers vector[28,35–38].
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