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Metals 2015, 5(2), 656-668; doi:10.3390/met5020656

Development of Nanocrystalline 304L Stainless Steel by Large Strain Cold Working

Belgorod State University, Pobeda 85, Belgorod 308015, Russia
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Author to whom correspondence should be addressed.
Academic Editor: Heinz Werner Höppel
Received: 29 March 2015 / Revised: 11 April 2015 / Accepted: 14 April 2015 / Published: 22 April 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
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Abstract

The microstructural changes leading to nanocrystalline structure development and the respective tensile properties were studied in a 304L stainless steel subjected to large strain cold rolling at ambient temperature. The cold rolling was accompanied by the development of deformation twinning and martensitic transformation. The latter readily occurred at deformation microshear bands, leading the martensite fraction to approach 0.75 at a total strain of 3. The deformation twinning followed by microshear banding and martensitic transformation promoted the development of nanocrystalline structure consisting of a uniform mixture of austenite and martensite grains with their transverse sizes of 120–150 nm. The developed nanocrystallites were characterized by high dislocation density in their interiors of about 3 × 1015 m−2 and 2 × 1015 m−2 in austenite and martensite, respectively. The development of nanocrystalline structures with high internal stresses led to significant strengthening. The yield strength increased from 220 MPa in the original hot forged state to 1600 MPa after cold rolling to a strain of 3. View Full-Text
Keywords: austenitic stainless steel; severe plastic deformation; deformation twinning; strain-induced martensite; grain refinement; nanocrystalline structure; strengthening austenitic stainless steel; severe plastic deformation; deformation twinning; strain-induced martensite; grain refinement; nanocrystalline structure; strengthening
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Odnobokova, M.; Belyakov, A.; Kaibyshev, R. Development of Nanocrystalline 304L Stainless Steel by Large Strain Cold Working. Metals 2015, 5, 656-668.

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