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Metallurgical and Materials Transactions A

, Volume 42, Issue 5, pp 1349–1361 | Cite as

Microstructure and Mechanical Properties in Hot-Rolled Extra High-Yield-Strength Steel Plates for Offshore Structure and Shipbuilding

  • Dongsheng LiuEmail author
  • Qingliang Li
  • Toshihiko Emi
Article

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.

Keywords

Austenite Bainite Acicular Ferrite Polygonal Ferrite Continuous Cool Transformation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors acknowledge the financial support received from Shasteel. The authors are indebted to Ms. S. Chen and Dr. X. Zhang for arranging the hot plate rolling trials. The able assistance received from Dr. H. Zhang, Mr. B. Cheng, and Mr. H. Zhu is warmly appreciated.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2010

Authors and Affiliations

  1. 1.Institute of Research of Iron and SteelZhangjiagang CityPeople’s Republic of China
  2. 2.Bekaert Binjiang Steel Cord Co. Ltd.Jiangyin CityPeople’s Republic of China

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