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Effects of Start and Finish Cooling Temperatures on Microstructure and Mechanical Properties of Low-Carbon High-Strength and Low-Yield Ratio Bainitic Steels SCIE SCOPUS

Title
Effects of Start and Finish Cooling Temperatures on Microstructure and Mechanical Properties of Low-Carbon High-Strength and Low-Yield Ratio Bainitic Steels
Authors
HYO KYUNG SUNGLee, SSANG YONG SHIN
Date Issued
2014-04
Publisher
SPRINGER
Abstract
The effects of start and finish cooling temperatures on microstructure and mechanical properties of low-carbon high-strength and low-yield ratio bainitic steels were investigated in this study. Four kinds of low-carbon high-strength and low-yield ratio bainitic steels were fabricated by varying the start and finish cooling temperatures and cooling rates, and their microstructure and mechanical properties such as tensile and Charpy impact properties were measured. In the steels cooled down from the high start cooling temperature above Ar-1 [978 K (705 A degrees C)], the volume fraction of acicular ferrite is lower than in the steels cooled down from the low start cooling temperature below Ar-1 [978 K (705 A degrees C)]. The finish cooling temperatures and cooling rates affect the formation of bainitic ferrite, granular bainite, and martensite-austenite (MA) constituents. According to the correlation between microstructure and mechanical properties, the tensile strength increases with increasing the volume fractions of bainitic ferrite and MA constituents, whereas the elongation decreases. The yield ratio decreases as the volume fraction of MA constituents increases. Charpy impact absorbed energy is proportional to the volume fraction of acicular ferrite, and is inversely proportional to the volume fraction of granular bainite.
URI
https://oasis.postech.ac.kr/handle/2014.oak/11623
DOI
10.1007/S11661-013-2156-2
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 45A, no. 4, page. 2004 - 2013, 2014-04
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이성학LEE, SUNG HAK
Dept of Materials Science & Enginrg
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