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Effects of Microstructure and Pre-strain on Bauschinger Effect in API X70 and X80 Linepipe Steels SCIE SCOPUS KCI

Title
Effects of Microstructure and Pre-strain on Bauschinger Effect in API X70 and X80 Linepipe Steels
Authors
Seok Su SohnSeung Youb HanSang Yong ShinJin-ho BaeLee, S
Date Issued
2013-05
Publisher
SPRINGER
Abstract
In this study, effects of microstructure and pre-strain on the Bauschinger effect were investigated in two API X70 and two API X80 linepipe steel sheets fabricated by controlling the cooling condition, and their yield strength and Bauschinger parameters were measured by the tension-compression test with varying tension pre-strain. The fast-cooled steels had the higher fraction of acicular ferrite, granular bainite and martensite-austenite (MA) constituents and smaller grain sizes. The reduction in yield stress (Delta YS) of the steels having a higher fraction of MA and smaller grain sizes was higher than that of the steels having a lower fraction of MA and larger grain sizes. The Delta YS was smallest at the pre-strain of 1%, reached the maximum at the pre-strain of 2%, and then decreased with increasing pre-strain. This result could be explained by the amounts of mobile dislocations and back stress, which affected the Bauschinger effect and strain hardening effect simultaneously. Since these two effects affected the yield strength on a competing basis, the Bauschinger stress and hardening parameter were used to separately analyze these effects. It could be confirmed that the Bauschinger effect and strain hardening effect were activated at pre-strains of 1-2% and 3-4%, respectively.
Keywords
linepipe steel; cold working; bauschinger effect; work hardening; tensile test; LOW-CARBON; PLATE
URI
https://oasis.postech.ac.kr/handle/2014.oak/15129
DOI
10.1007/S12540-013-3007-9
ISSN
1598-9623
Article Type
Article
Citation
Metals and Materials International, vol. 19, no. 3, page. 423 - 431, 2013-05
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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