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Microstructural characterization and residual stress distribution in a nanostructured austenitic stainless steel

Agnieszka T. Krawczynska, Malgorzata Lewandowska and Anthony T. Fry

Abstract

In this paper, residual stress distribution is investigated by a novel X-ray cosα diffraction technique in a nanostructured austenitic stainless steel after hydrostatic extrusion processes. Hydrostatic extrusion performed at 20°C and with a total true strain of 2.3 leads to the creation of a nanostructure consisting of nanotwins and shear bands. The results reveal that the greatest compressive residual stresses of −1 GPa are found 3 mm from the surface of the nanostructured austenitic stainless steel. These compressive residual stresses restrict crack growth into the material, thereby preventing catastrophic failure.


*Correspondence address, Agnieszka Krawczyńska, PhD Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, Warsaw 02-507, Poland, Tel.: +48222348455, Fax:+48222348514, E-mail: , Web: www.inmat.pw.edu.pl

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Received: 2017-12-28
Accepted: 2018-03-26
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München