Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Dissolution Behavior of Complex Carbonitrides in a Microalloyed Steel

Microalloyed 강에서 복합 탄질화물의 재용해 거동

  • Jung, Jae-Gil (Department of Materials Science and Engineering, Yonsei University) ;
  • Park, June-Soo (Department of Materials Science and Engineering, Yonsei University) ;
  • Ha, Yang-Soo (Department of Materials Science and Engineering, Yonsei University) ;
  • Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University) ;
  • Bae, Jin-Ho (Technical Research Laboratories, POSCO) ;
  • Kim, Kisoo (Technical Research Laboratories, POSCO)
  • 정재길 (연세대학교 공과대학 신소재공학과) ;
  • 박준수 (연세대학교 공과대학 신소재공학과) ;
  • 하양수 (연세대학교 공과대학 신소재공학과) ;
  • 이영국 (연세대학교 공과대학 신소재공학과) ;
  • 배진호 (포스코기술연구소) ;
  • 김기수 (포스코기술연구소)
  • Received : 2008.10.07
  • Accepted : 2008.10.20
  • Published : 2008.11.30
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Abstract

Dissolution behavior of complex carbonitrides in a Nb-Ti-V microalloyed steel was quantitatively examined by electrical resistivity, transmission electron microscopy (TEM), and optical microscopy. The electrical resistivity increased with solution treatment temperature up to $1250^{\circ}C$ for a holding time of 15 min. But, an increasing rate of electrical resistivity with temperature was obviously decreased above $1150^{\circ}C$. As the solution treatment temperature increases, irregular shaped Nb-rich carbonitrides disappear and cuboidal Ti-rich carbonitrides are observed. Abnormal grain growth occurs above $1250^{\circ}C$ for a holding time of 15 min. The optimal solution treatment temperature of a Nb-Ti-V microalloyed steel was determined as $1200^{\circ}C$ for a holding time of 15 min.

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References

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