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Effects of Alloying Elements and the Cooling Condition on the Microstructure, Tensile Properties, and Charpy Impact Properties of High-Strength Bainitic Steels

Title
Effects of Alloying Elements and the Cooling Condition on the Microstructure, Tensile Properties, and Charpy Impact Properties of High-Strength Bainitic Steels
Authors
Sung, HKShin, SYHwang, BLee, CGKim, NJLee, S
POSTECH Authors
Kim, NJLee, S
Date Issued
Sep-2010
Publisher
KOREAN INST METALS MATERIALS
Abstract
The effects of alloying elements and the cooling condition on the microstructure, tensile properties, and Charpy impact properties of high-strength bainitic steel plates fabricated by a controlled rolling process were investigated in the present study. Eight kinds of steel plates were fabricated by varying C, Cr, and Nb additions under two different cooling rates, and their microstructures and tensile and Charpy impact properties were evaluated. The microstructures present in the steels increased in the order of granular bainite, acicular ferrite, bainitic ferrite, and martensite as the carbon equivalent or cooling rate increased, which resulted in a decrease in the ductility and Charpy absorbed energy. The steels containing a considerable amount of bainitic ferrite or martensite showed very high strengths, together with good ductility and Charpy absorbed energy. In order to achieve the best combination of strength, ductility, and Charpy absorbed energy, granular bainite and acicular ferrite were properly included in the high-strength bainitic steels by controlling the carbon equivalent and cooling rate, while about 50 vol.% of bainitic ferrite or martensite was maintained to maintain the high strength.
Keywords
High-strength bainitic steel; Metals; Rolling; Mechanical properties; Scanning electron microscopy (SEM); CARBON STEELS; ACICULAR FERRITE; TRANSFORMATION; DEFORMATION; BEHAVIOR; MORPHOLOGY; AUSTENITE; EQUATION
URI
http://oasis.postech.ac.kr/handle/2014.oak/25443
DOI
10.3365/KJMM.2010.48.09.798
ISSN
1738-8228
Article Type
Article
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, vol. 48, no. 9, page. 798 - 806, 2010-09
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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