Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Effects of V on the Formation of Ti-Nb-V Cabonitrides and Mechanical Properties in Low Carbon HSLA Steels

저탄소.저합금강의 Ti-Nb-V 복합 탄질화물 형성 및 기계적 특성에 미치는 V 첨가의 효과

  • 강주석 (포항공과대학교 신소재공학과) ;
  • 김득중 (포스코 품질기부) ;
  • 박찬경 (포항공과대학교 신소재공학과)
  • Published : 2006.11.01
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Abstract

Effects of V on both the formation of Ti-Nb-V carbonitrides and mechanical properties of Ti-Nb bearing low carbon HSLA steels were investigated. Hot rolling process was simulated by using Gleeble 3500 system with the steels containing three different levels of V ($0{\sim}0.1wt.%$). Vanadium precipitated as Ti-Nb-V carbonitrides at austenite region but it did not precipitate as VC during austenite to acicular ferrite or bainitic ferrite phase transformation. As V content increased, the amount of Nb precipitates was decreased but the average size of Ti-Nb-V carbonitrides was increased due to larger diffusivity of V than that of Nb. Coarsened Ti-Nb-V carbonitrides could act as heterogeneous nucleation site during ${\gamma}{\rightarrow}{\alpha}$ phase transformation, thus, acicular ferrite transformation was promoted as V content increased, resulting in increase of upper shelf energy.

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References

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