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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  

Han, Seung Youb (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Shin, Sang Yong (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Seo, Chang-hyo (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Lee, Hakcheol (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Bae, Jin-ho (Sheet Products & Process Research Group Technical Research Laboratories, POSCO)
Kim, Kisoo (Sheet Products & Process Research Group Technical Research Laboratories, POSCO)
Lee, Sunghak (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Kim, Nack J. (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
Publication Information
Korean Journal of Metals and Materials / v.46, no.12, 2008 , pp. 788-799 More about this Journal
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.
Keywords
API X80 linepipe steel; tensile properties; charpy impact properties; effective grain size;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By Web Of Science : 1  (Related Records In Web of Science)
Times Cited By SCOPUS : 2
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