Journal
ACTA MATERIALIA
Volume 54, Issue 6, Pages 1659-1669Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2005.11.034
Keywords
high-pressure torsion; high-resolution electron microscopy (HREM); iron and steels; nanocrystalline microstructure; martensitic phase transformation
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High-resolution transmission electron microscopy and three-dimensional atom probe observations show clearly that a reverse transformation of body-centred cubic ferrite to face-centred cubic austenite occurs during severe plastic deformation of a pearlitic steel resulting in a nanocrystalline structure, something that never occurs in conventional deformation of coarse-grained iron and steels. The driving force and the mechanisms of this reverse transformation are discussed. It is shown that nanostructure and shear stresses are essential for this process, and the results confirm molecular dynamics predictions of such transformations in nanocrystalline iron. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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