Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Carbon and Nickel on Microstructure and Low Temperature Charpy Impact Properties of HSLA Steels

HSLA 강의 미세조직과 저온 샤르피 충격 특성에 미치는 탄소와 니켈의 영향

  • Eom, Haewon (Department of Convergence Technology for Heavy Industries, University of Ulsan) ;
  • Cho, Sung Kyu (Technical Research Center, Hyundai Steel Company) ;
  • Cho, Young Wook (Technical Research Center, Hyundai Steel Company) ;
  • Shin, Gunchul (School of Materials Science and Engineering, University of Ulsan) ;
  • Kwon, Yongjai (School of Materials Science and Engineering, University of Ulsan) ;
  • Lee, Jung Gu (School of Materials Science and Engineering, University of Ulsan) ;
  • Shin, Sang Yong (Department of Convergence Technology for Heavy Industries, University of Ulsan)
  • 엄해원 (울산대학교 중공업융합기술공학과) ;
  • 조성규 (현대제철 R&D Center) ;
  • 조영욱 (현대제철 R&D Center) ;
  • 신건철 (울산대학교 첨단소재공학부) ;
  • 권용재 (울산대학교 첨단소재공학부) ;
  • 이정구 (울산대학교 첨단소재공학부) ;
  • 신상용 (울산대학교 중공업융합기술공학과)
  • Received : 2020.01.21
  • Accepted : 2020.03.26
  • Published : 2020.04.27
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Abstract

In this study, effects of carbon and nickel on microstructure and low temperature Charpy impact properties of HSLA (high strength low alloy) steels are investigated. To understand the complex phase transformation behavior of HSLA steels with high strength and toughness before and after welding processes, three kinds of HSLA steels are fabricated by varying the carbon and nickel content. Microstructure analysis, low temperature Charpy impact test, and Vickers hardness test are performed for the base metals and CGHAZ (coarse-grain heat affected zone) specimens. The specimens with the lowest carbon and nickel content have the highest volume fraction of AF, the lowest volume fraction of GB, and the smallest GB packet size. So, the low temperature Charpy absorbed energy of the CGHAZ specimen is the highest. The specimens with increased carbon and nickel content have the lowest volume fraction of AF, the highest volume fraction of GB, and the largest GB packet size. So, the low temperature Charpy absorbed energy of the CGHAZ specimen is the lowest.

Keywords

References

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