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Serration Phenomena Occurring During Tensile Tests of Three High-Manganese Twinning-Induced Plasticity (TWIP) Steels

Title
Serration Phenomena Occurring During Tensile Tests of Three High-Manganese Twinning-Induced Plasticity (TWIP) Steels
Authors
Hong, SShin, SYLee, JDONG-HYUN AHNKim, HSSUNG-KYU KIMKWANG-GEUN CHINLee, S
POSTECH Authors
Kim, HSLee, S
Date Issued
Feb-2014
Publisher
SPRINGER
Abstract
In this study, the serration phenomena of two high-Mn TWIP steels and an Al-added TWIP steel were examined by tensile tests, and were explained by the microstructural evolution including formation of localized Portevin-Le Chatelier deformation bands and twins. In stress-strain curves of the high-Mn steels, serrations started in a fine and short shape, and their height and periodic interval increased with increasing strain, whereas the Al-added steel did not show any serrations. According to digital images of strain rate and strain obtained from a vision strain gage system, deformation bands were initially formed at the upper region of the gage section, and moved downward along the tensile loading direction. The time when the band formation started was matched with the time when one serration occurred in the stress-time curve. This serration behavior was generally explained by dynamic strain aging, which was closely related with the formation of deformation bands. (C) The Minerals, Metals & Materials Society and ASM International 2013
In this study, the serration phenomena of two high-Mn TWIP steels and an Al-added TWIP steel were examined by tensile tests, and were explained by the microstructural evolution including formation of localized Portevin-Le Chatelier deformation bands and twins. In stress-strain curves of the high-Mn steels, serrations started in a fine and short shape, and their height and periodic interval increased with increasing strain, whereas the Al-added steel did not show any serrations. According to digital images of strain rate and strain obtained from a vision strain gage system, deformation bands were initially formed at the upper region of the gage section, and moved downward along the tensile loading direction. The time when the band formation started was matched with the time when one serration occurred in the stress-time curve. This serration behavior was generally explained by dynamic strain aging, which was closely related with the formation of deformation bands. (C) The Minerals, Metals & Materials Society and ASM International 2013
URI
http://oasis.postech.ac.kr/handle/2014.oak/15126
DOI
10.1007/S11661-013-2007-1
ISSN
1073-5623
Article Type
Article
Citation
Metallurgical and Materials Transactions A, vol. 45A, page. 633 - 646, 2014-02
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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