Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Dissolution and Precipitation behaviors of Complex Carbonitrides in Austenite of a V-Nb Microalloyed Steel

V-Nb Microalloyed 강의 오스테나이트역에서 복합 탄질화물의 재용해 및 석출 거동

  • Ha, Yangsoo (Department of Materials Science and Engineering, Yonsei University) ;
  • Jung, Jae-Gil (Department of Materials Science and Engineering, Yonsei University) ;
  • Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University)
  • 하양수 (연세대학교 공과대학 신소재공학과) ;
  • 정재길 (연세대학교 공과대학 신소재공학과) ;
  • 이영국 (연세대학교 공과대학 신소재공학과)
  • Received : 2011.06.29
  • Published : 2011.12.25
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Abstract

Dissolution and precipitation behaviors of complex carbonitrides in austenite of a V-Nb microalloyed steel were quantitatively examined through electrical resistivity measurement and transmission electron microscopy. The electrical resistivity increased with solution treatment temperature up to $1240^{\circ}C$ and then was saturated at $225n{\Omega}m$ for a holding time of 10 min. The electrical resistivity method was also used to quantitatively measure the isothermal precipitation kinetics of the complex carbonitrides in austenite. Nb-rich precipitates were observed in austenite at the early stages of precipitation, but Nb was replaced by V up to the equilibrium amount within the precipitates with further holding time. The time-temperature-precipitation diagram showed a C-type curve; nose temperature and its incubation time were $900^{\circ}C$ and 100 s, respectively.

Keywords

Acknowledgement

Grant : 초고장력 H 형강 및 철근 기술개발

Supported by : 지식경제부

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