Development of high strength hot rolled low carbon copper-bearing steel containing nanometer sized carbides

Title
Development of high strength hot rolled low carbon copper-bearing steel containing nanometer sized carbides
Authors
Phaniraj Madakashira신영민Joonho LeeNam Hoon Goo김동익서진유정우상심재혁최인석
Keywords
HSLA steel; Copper; Nano-sized carbides; Interrupted cooling; Numerical simulation
Issue Date
2015-05
Publisher
Materials science & engineering. A, Structural materials : properties, microstructure and processing
Citation
VOL 633, 1-8
Abstract
A low carbon ferritic steel was alloyed with Ti, Mo and Cu with the intention of achieving greater increment in strength by multiple precipitate strengthening. The steel is hot rolled and subjected to interrupted cooling to enable precipitation of Ti&#8211;Mo carbides and copper. Thermodynamic calculations were carried out to determine equilibrium phase fractions at different temperatures. Microstructure characterization using transmission electron microscopy and composition analysis revealed that the steel contains ~5 nm size precipitates of (Ti,Mo)C. Precipitation kinetics calculations using MatCalc software showed that mainly body centered cubic copper precipitates of size < 5nm form under the cooling conditions in the present study. The steel has the high tensile strength of 853 MPa and good ductility. The yield strength increases by 420 MPa, which is more than that achieved in hot rolled low carbon ferritic steels with only copper precipitates or only carbide precipitates. The precipitation and strengthening contribution of copper and (Ti,Mo)C precipitates and their effect on the work hardening behavior is discussed.
URI
http://pubs.kist.re.kr/handle/201004/49713
ISSN
09215093
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KIST Publication > Article
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