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EFFECT OF MO, CR, AND V ON TENSILE AND CHARPY IMPACT PROPERTIES OF API X80 LINEPIPE STEELS ROLLED IN SINGLE PHASE REGION

Title
EFFECT OF MO, CR, AND V ON TENSILE AND CHARPY IMPACT PROPERTIES OF API X80 LINEPIPE STEELS ROLLED IN SINGLE PHASE REGION
Authors
Han, Seung-YoubShin, Sang-YongSeo, Chang-HyoLee, Hak-CheolBae, Jin-HoMm, KLEE, SUNG HAKKim, NJ
POSTECH Authors
LEE, SUNG HAKKim, NJ
Date Issued
Jan-2008
Publisher
KOREAN INST METALS MATERIALS
Abstract
This study is concerned with the effects of Mo, Cr, and V addition on tensile and Charpy impact properties of API X80 linepipe steels. Four kinds of steels were processed by varying Mo, Cr, and V additions, and their microstructures and tensile and Charpy impact properties were investigated. Since the addition of Mo and V promoted to form fine acicular ferrite and granular bainite, while prohibiting the coarsening of granular bainite, it increased the strength and upper shelf energy, and decreased the energy transition temperature. The Cr addition promoted the formation of coarse granular bainite and secondary phases such as martensite-austenite constituents, thereby leading to the increased effective grain size, energy transition temperature, and strength and to the decreased upper shelf energy. The steel containing 0.3wt.% Mo and 0.06wt.% V without Cr had the highest upper shelf energy and the lowest energy transition temperature because its microstructure was composed of fine acicular ferrite and granular bainite, together with a small amount of hard secondary phases, while its tensile properties maintained excellent.
This study is concerned with the effects of Mo, Cr, and V addition on tensile and Charpy impact properties of API X80 linepipe steels. Four kinds of steels were processed by varying Mo, Cr, and V additions, and their microstructures and tensile and Charpy impact properties were investigated. Since the addition of Mo and V promoted to form fine acicular ferrite and granular bainite, while prohibiting the coarsening of granular bainite, it increased the strength and upper shelf energy, and decreased the energy transition temperature. The Cr addition promoted the formation of coarse granular bainite and secondary phases such as martensite-austenite constituents, thereby leading to the increased effective grain size, energy transition temperature, and strength and to the decreased upper shelf energy. The steel containing 0.3wt.% Mo and 0.06wt.% V without Cr had the highest upper shelf energy and the lowest energy transition temperature because its microstructure was composed of fine acicular ferrite and granular bainite, together with a small amount of hard secondary phases, while its tensile properties maintained excellent.
URI
http://oasis.postech.ac.kr/handle/2014.oak/28620
ISSN
1738-8228
Article Type
Article
Citation
JOURNAL OF THE KOREAN INSTITUTE OF METALS AND MATERIALS, vol. 46, no. 12, page. 788 - 799, 2008-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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