Abstract
Strain-induced cementite dissolution is a well-documented phenomenon, which occurs during the cold plastic deformation of pearlitic steels. Recently new results that can shed additional light on the mechanisms of this process were obtained thanks to atom probe tomography investigations of pearlitic steel deformed by highpressure torsion (HPT). It was shown that the process of cementite decomposition starts by carbon depletion from the carbides due to defect motion; once enough carbon is robbed from the carbide it is thermodynamically destabilized resulting in rapid break-up. Additionally, it was shown that the carbon atoms do not really dissolve in the ferrite but that they segregate to the dislocations and grain boundaries of nanocrystalline ferrite.
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Ivanisenko, Y., Sauvage, X., MacLaren, I., Fecht, H.J. (2009). Nanostructuring and Dissolution of Cementite in Pearlitic Steels During Severe Plastic Deformation. In: Hahn, H., Sidorenko, A., Tiginyanu, I. (eds) Nanoscale Phenomena. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00708-8_5
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