Microstructure and Mechanical Properties in Hot-Rolled Extra High-Yield-Strength Steel Plates for Offshore Structure and Shipbuilding |
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Authors: | Dongsheng Liu Qingliang Li Toshihiko Emi |
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Affiliation: | (1) Institute of Research of Iron and Steel, Shasteel, Jinfeng Town, Zhangjiagang City, Jiangsu Province, 215625, People’s Republic of China;(2) Bekaert Binjiang Steel Cord Co. Ltd., Jiangyin City, Jiangsu Province, 215625, People’s Republic of China |
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Abstract: | Key parameters for a thermomechanically controlled processing and accelerated cooling process (TMCP-AcC) were determined for
integrated mass production to produce extra high-yield-strength microalloyed low carbon SiMnCrNiCu steel plates for offshore
structure and bulk shipbuilding. Confocal scanning microscopy was used to make in-situ observations on the austenite grain growth during reheating. A Gleeble 3800 thermomechanical simulator was employed to investigate
the flow stress behavior, static recrystallization (SRX) of austenite, and decomposition behavior of the TMCP conditioned
austenite during continuous cooling. The Kocks–Mecking model was employed to describe the constitutive behavior, while the
Johnson–Mehl–Avrami–Kolmogorov (JMAK) approach was used to predict the SRX kinetics. The effects of hot rolling schedule and
AcC on microstructure and properties were investigated by test-scale rolling trials. The bridging between the laboratory observations
and the process parameter determination to optimize the mass production was made by integrated industrial production trials
on a set of a 5-m heavy plate mill equipped with an accelerated cooling system. Successful production of 60- and 50-mm-thick
plates with yield strength in excess of 460 MPa and excellent toughness at low temperature (213 K (–60 °C)) in the parent
metal and the simulated coarse-grained heat affected zone (CGHAZ) provides a useful integrated database for developing advanced
high-strength steel plates via TMCP-AcC. |
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