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Deformation behavior of a high-plasticity nano/ultrafine-grained N-bearing duplex stainless steel: Twin/twin-like induced plasticity effect

Title
Deformation behavior of a high-plasticity nano/ultrafine-grained N-bearing duplex stainless steel: Twin/twin-like induced plasticity effect
Authors
Mohammad Moallemi, Abbas Zarei-HanzakiKIM, SUNG JOON, Changwan HongPooriya Dastranjy Nezhadfar
POSTECH Authors
KIM, SUNG JOON
Date Issued
Jul-2017
Publisher
ELSEVIER SCIENCE SA
Abstract
The present study deals with the grain refinement of a high nitrogen duplex stainless steel through cold rolling up to 80% and subsequent reversion annealing in the range of 750 degrees C to 1100 degrees C at various duration times. The microstructural observations showed that the nano/ultrafine-grained (NG/UFG) austenite with the grain size of 400 nm was obtained by annealing at 900 degrees C for 30 s due to alpha-martensite to austenite complete reverse transformation. The NG/UFG duplex steel indicated a superior mechanical properties consist of 1 GPa yield strength (YS) and 40% elongation to fracture. The transmission electron microscopy study of the tensile deformed NG/UFG material indicated that the nature of extraordinary plasticity in NG/UFG material is because of the dense planar defects, specifically, the twin/twin-like induced plasticity effect in austenite, accompanied with strain accommodation of coarse grain ferrite phase.
The present study deals with the grain refinement of a high nitrogen duplex stainless steel through cold rolling up to 80% and subsequent reversion annealing in the range of 750 degrees C to 1100 degrees C at various duration times. The microstructural observations showed that the nano/ultrafine-grained (NG/UFG) austenite with the grain size of 400 nm was obtained by annealing at 900 degrees C for 30 s due to alpha-martensite to austenite complete reverse transformation. The NG/UFG duplex steel indicated a superior mechanical properties consist of 1 GPa yield strength (YS) and 40% elongation to fracture. The transmission electron microscopy study of the tensile deformed NG/UFG material indicated that the nature of extraordinary plasticity in NG/UFG material is because of the dense planar defects, specifically, the twin/twin-like induced plasticity effect in austenite, accompanied with strain accommodation of coarse grain ferrite phase.
Keywords
MECHANICAL-PROPERTIES; MICROSTRUCTURE; TRANSFORMATION
URI
http://oasis.postech.ac.kr/handle/2014.oak/41066
DOI
10.1016/j.msea.2017.06.040
ISSN
0921-5093
Article Type
Article
Citation
Materials Science and Engineering: A, vol. 700, page. 637 - 640, 2017-07
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 KIM, SUNG JOON
Graduate Institute of Ferrous Technology
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