Recrystallization and grain growth of a nano/ultrafine structured austenitic stainless steel during annealing under high hydrostatic pressure

Author(s)
Agnieszka Teresa Krawczynska, Stanislaw Gierlotka, Przemyslaw Suchecki, Daria Setman, Boguslawa Adamczyk-Cieslak, Malgorzata Lewandowska, Michael Zehetbauer
Abstract

The aim of this study was to investigate the effect of high hydrostatic pressure applied during annealing on the processes of recrystallization and grain growth in nanostructured austenitic stainless steel 316LVM. The nanostructures were obtained by profile rolling to a total strain of 3.4 and by high-pressure torsion to a total strain of 79. These processes resulted in microstructures consisting of nanotwins and nanograins, respectively. The deformed samples were annealed at 900 A degrees C for 10 min under atmospheric or hydrostatic pressures of 2 and 6 GPa. The resulting microstructures were examined using transmission and scanning electron microscopy techniques. The mechanical properties were evaluated in microhardness measurements. It was established that annealing under high hydrostatic pressure retards recrystallization and grain growth, both in profile-rolled and high-pressure torsion-processed samples. The magnitude of retardation depends on the character of the grain boundaries. The non-equilibrium high-angle grain boundaries present in the high-pressure torsion-processed sample show higher mobility under pressure than the nanotwinned and low-angle boundaries in the profile-rolled sample.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
Warsaw University of Technology, Polish Academy of Sciences (PAS)
Journal
Journal of Materials Science
Volume
53
Pages
11823-11836
No. of pages
14
ISSN
0022-2461
DOI
https://doi.org/10.1007/s10853-018-2459-1
Publication date
08-2018
Peer reviewed
Yes
Austrian Fields of Science 2012
Materials physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/recrystallization-and-grain-growth-of-a-nanoultrafine-structured-austenitic-stainless-steel-during-annealing-under-high-hydrostatic-pressure(4e202d95-16e7-4fbb-8bdc-1121fd06737b).html