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Tensile and Charpy Impact Properties of High-Strength Bainitic Steels Fabricated by Controlled Rolling Process

Title
Tensile and Charpy Impact Properties of High-Strength Bainitic Steels Fabricated by Controlled Rolling Process
Authors
Sung, HKShin, SYHwang, BLee, CGKim, NJLee, S
POSTECH Authors
Kim, NJLee, S
Date Issued
Jul-2010
Publisher
KOREAN INST METALS MATERIALS
Abstract
This study is concerned with tensile and Charpy impact properties of high-strength bainitic steels fabricated by controlled rolling process. Six kinds of steels were fabricated by varying finish rolling temperature, start cooling temperature, and cooling rate, and their microstructures and tensile and Charpy impact properties were investigated. Their effective grain sizes were also characterized by the electron back-scatter infraction analysis. The microstructures of the steels rolled in the single phase region were most similar to those of the steels rolled in the two phase region. The steels cooled from 700 degrees C were composed mainly of granular bainites, while those cooled from 600 degrees C contained a number of bainitic ferrites, which resulted in the decrease in ductility and upper shelf energy in spite of the increase in strength. In the steels cooling from 600 degrees C, fine acicular ferrites were well formed when the cooling rate was slow, which led to the best combination of high ductility, high upper shelf energy, and low energy transition temperature according to the decrease in the overall effective grain size due to the presence of acicular ferrites having smaller effective gram size.
Keywords
bainitic steels; metals; rolling; strength; tensile test; CARBON STEELS; MECHANICAL-PROPERTIES; ACICULAR FERRITE; PIPELINE STEEL; MICROSTRUCTURES; BEHAVIOR; TRANSFORMATION; DEFORMATION; TEMPERATURE; MORPHOLOGY
URI
http://oasis.postech.ac.kr/handle/2014.oak/25448
DOI
10.3365/KJMM.2010.48.07.615
ISSN
1738-8228
Article Type
Article
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, vol. 48, no. 7, page. 615 - 624, 2010-07
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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