Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 35A, Issue 11, Pages 3423-3430Publisher
SPRINGER
DOI: 10.1007/s11661-004-0178-5
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The cold-rolled microstructure formed in an interstitial-free (IF) steel from low to medium reductions has been investigated by using transmission electron microscopy. Dislocation cells formed early in the process and reduced in size until a critical strain was reached, beyond which they remained at a constant size of similar to1-mum diameter. The critical strain coincided with the formation of microbands, and it is proposed here that microbands carry all the deformation from their creation, rendering cell refinement unnecessary. Furthermore, since the dislocation densities of meshes and cells are almost identical and the stored elastic energy E-Cell is always less than E-mesh it is proposed that cells are derived from the dislocation mesh structure. Microbands grow quickly to a length that is limited by grain boundaries. The thermodynamic condition favoring microband formation is (partial derivativeE(MB)/partial derivativep) < (partial derivativeE(Cell)/partial derivativep) and the microbands are not derived from cell structures but from dislocation sheets or walls on which deformation is concentrated.
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