On Regularities of Grain Refinement through Large Strain Deformation

Abstract:

The recent studies on grain refinement in austenitic stainless steels during large strain deformations are critically reviewed. The paper is focused on the mechanism of structural changes that is responsible for the development of submicrocrystalline structures that can be interpreted as continuous dynamic recrystallization developing under conditions of warm working. The final grain size that is attainable by large strain warm working can be expressed by a power law function of temperature compensated strain rate with an exponent of about -0.15. The development of submicrocrystalline structures is assisted by the deformation microbanding and dynamic recovery, which are characterized by opposite temperature dependencies. The grain refinement kinetics, therefore, are characterized by a weak temperature dependence for a wide range of warm working conditions.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 314-319
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.314
• Online since: January 2016
• Authors: Andrey Belyakov*, Zhanna Yanushkevich, Marina Tikhonova, Rustam Kaibyshev
• Keywords: Austenitic Stainless Steels, Dynamic Recrystallization, Grain Refinement, Large Strain Deformation, Ultrafine-Grained Microstructures

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