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Metals 2016, 6(11), 268; doi:10.3390/met6110268

Grain Boundary Assemblies in Dynamically-Recrystallized Austenitic Stainless Steel

Laboratory of Mechanical Properties of Nanostructured Materials and Superalloys, Belgorod State University, Pobeda 85, Belgorod 308015, Russia
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Academic Editor: Soran Birosca
Received: 26 September 2016 / Revised: 28 October 2016 / Accepted: 2 November 2016 / Published: 7 November 2016
(This article belongs to the Special Issue Process-Structure-Property Relationships in Metals)
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Abstract

The grain boundary misorientation distributions associated with the development of dynamic recrystallization were studied in a high-nitrogen austenitic stainless steel subjected to hot working. Under conditions of discontinuous dynamic recrystallization, the relationships between the grain or subgrain sizes and flow stresses can be expressed by power law functions with different grain/subgrain size exponents of about −0.76 (for grain size) or −1.0 (for subgrain size). Therefore, the mean grain size being much larger than the subgrain size under conditions of low flow stress gradually approaches the size of the subgrains with an increase in the flow stress. These dependencies lead to the fraction of high-angle boundaries being a function of the flow stress. Namely, the fraction of ordinary high-angle boundaries in dynamically-recrystallized structures decreases with a decrease in the flow stress. On the other hand, the fraction of special boundaries, which are associated with annealing twins, progressively increases with a decrease of the flow stress. View Full-Text
Keywords: dynamic recrystallization; austenitic stainless steel; grain boundary engineering; hot working dynamic recrystallization; austenitic stainless steel; grain boundary engineering; hot working
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Tikhonova, M.; Dolzhenko, P.; Kaibyshev, R.; Belyakov, A. Grain Boundary Assemblies in Dynamically-Recrystallized Austenitic Stainless Steel. Metals 2016, 6, 268.

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