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Large deformation behavior of twin-induced plasticity steels under high-pressure torsion

Title
Large deformation behavior of twin-induced plasticity steels under high-pressure torsion
Authors
Byung Ho ParkHo Young UmJung Gi KimHu Younh JeongLee, SKim, HS
POSTECH Authors
Lee, SKim, HS
Date Issued
Nov-2016
Publisher
Springer
Abstract
A high-manganese twinning-induced plasticity (TWIP) steel is processed by high-pressure torsion (HPT) for up to 1 turn under 6 GPa pressure. The HPT-processed TWIP steels exhibit a homogeneous microstructure with a peak hardness of Hv 550. Deformation twinning is developed significantly in the early stage of the shear deformation, but is exhausted soon after 1/2 turn. The strength of the HPT-processed TWIP steel significantly increased due to the accumulation of dislocations, but elongation dramatically decreased due to a lack of dislocations available for plastic deformations. An analysis of the evolution of strength by imposed large strain under high pressure suggests that strain hardening due to dislocation and twinning is exhausted in the early stages of the HPT process. Further strategy for enhancing both strength and ductility is proposed.
URI
http://oasis.postech.ac.kr/handle/2014.oak/37434
DOI
10.1007/S12540-016-6279-Z
ISSN
1598-9623
Article Type
Article
Citation
Matals and Materials International, vol. 22, no. 6, page. 1003 - 1008, 2016-11
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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