Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Rolling Conditions on Microstructure and Mechanical Properties of Thick Steel Plates for Offshore Platforms

해양플랜트용 후판강의 미세조직과 기계적 특성에 미치는 압연 조건의 영향

  • Kim, Jongchul (Technical Research Center, Hyundai Steel Company) ;
  • Suh, Yonhchan (Technical Research Center, Hyundai Steel Company) ;
  • Hwang, Sungdoo (Technical Research Center, Hyundai Steel Company) ;
  • Shin, Sang Yong (School of Materials Science and Engineering, University of Ulsan)
  • 김종철 (현대제철 기술연구소) ;
  • 서용찬 (현대제철 기술연구소) ;
  • 황성두 (현대제철 기술연구소) ;
  • 신상용 (울산대학교 첨단소재공학부)
  • Received : 2018.07.23
  • Accepted : 2018.08.09
  • Published : 2018.08.27
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Abstract

In this study, three kinds of steels are manufactured by varying the rolling conditions, and their microstructures are analyzed. Tensile and Charpy impact tests are performed at room temperature to investigate the correlation between microstructure and mechanical properties. In addition, heat affected zone(HAZ) specimens are fabricated through the simulation of the welding process, and the HAZ microstructure is analyzed. The Charpy impact test of the HAZ specimens is performed at $-40^{\circ}C$ to investigate the low temperature HAZ toughness. The main microstructures of steels are quasi-polygonal ferrite and pearlite with fine grains. Because coarse granular bainite forms with an increasing finish rolling temperature, the strength decreases and elongation increases. In the steel with the lowest reduction ratio, coarse granular bainite forms. In the HAZ specimens, fine acicular ferrites are the main features of the microstructure. The volume fraction of coarse bainitic ferrite and granular bainite increases with an increasing finish rolling temperature. The Charpy impact energy at $-40^{\circ}C$ decreases with an increasing volume fraction of bainitic ferrite and granular bainite. In the HAZ specimen with the lowest reduction ratio, coarse bainitic ferrite and granular bainite forms and the Charpy impact energy at $-40^{\circ}C$ is the lowest.

Keywords

References

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