Journal of Welding and Joining

  • 제14권2호
  • /
  • Pages.46-56
  • /
  • 1996
  • /
  • 2466-2232(pISSN)
  • /
  • 2466-2100(eISSN)
대한용접접합학회 (The Korean Welding and Joining Society)
권호 표지

Ti산화물강의 HAZ인성 및 미세조직에 미치는 용접열 cycle의 영향

Effect of weld thermal cycle on the HAZ toughness and microstructure of a Ti-oxide bearing steel

  • 정홍철 (포항종합제철(주), 기술연구소) ;
  • 한재광 (포항종합제철(주), 기술연구소) ;
  • 방국수 (산업과학기술연구소)
  • 발행 : 1996.04.01
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초록

HAZ impact toughness of Ti-oxide steel was investigated and compared to that of a conventional Ti-nitride steel. Toughness variations of each steel with weld peak temperatures and cooling rates were interpreted with microstructural transformation characteristics. In contrast to Ti-nitride steel showing continuous decrease in HAZ toughness with peak temperature, Ti-oxide steel showed increase in HAZ toughness above $1400^{\circ}C$ peak temperature. The HAZ microstructure of the Ti-oxide steel is characterized by the formation of intragranular ferrite plate, which was found to start from Ti-oxide particles dispersed in the matrix of the steel. Large austenite grain size above $1400^{\circ}C$ promoted intragranular ferrite plate formation in Ti-oxide steel while little intragranular ferrite plate was formed in Ti-nitride steel because of dissolution of Ti-nitrides. Ti-oxides in the Ti-oxide steel usually contain MnS and have crystal structures of TiO and/or $Ti_2O_3$.

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참고문헌

  1. Proceedings 6th International Iron and Steel congress Jinch Takamura(외)
  2. Non-metallic inclusions in ferritic steel weld metals, IIW Document IX-1486-87 D. J. Abson
  3. Welding Journal Improvement of HAZ toughness in HSLA steel by introducing finely dispersed Ti-oxide H. Homm(외)
  4. Metallurgical Transactions A v.22A no.11 Effect of killing time on the microstructure and toughness of the heat-affected zone in Ti-killed steels Jye-Lone Lee(외)
  5. ASTM STP 1042 A newly developed Tioxid bearing steel having high HAZ toughness, residual and unspecified element in steel Koichi Yamamoto(외)
  6. Mechanism of notch toughness improvent in Ti-Bi-bearing weld metals, IIW Document IX-1196-81 Mori N(외)
  7. Metallurgical Transactions A v.17A no.9 Inclusion phases and nucleation of acicular ferrite in submerged arc welds in high strength low alloy steels J. M. Dowling(외)
  8. Welding Journal v.37 no.5 C. M. Jr. Adams