대한금속재료학회지 (Korean Journal of Metals and Materials)

  • 제48권10호
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  • Pages.875-883
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  • 2010
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  • 1738-8228(pISSN)
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  • 2288-8241(eISSN)
대한금속재료학회 (The Korean Institute of Metals and Materials)
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복합산화물이 형성된 API X80 라인파이프강의 용접열영향부 샤르피 흡수에너지

Charpy Impact Properties of Heat Affected Zones of API X80 Linepipe Steels Containing Complex Oxides

  • 성효경 (포항공과대학교 항공재료연구센터) ;
  • 신상용 (포항공과대학교 항공재료연구센터) ;
  • 차우열 (POSCO 기술연구소 제강연구그룹) ;
  • 오경식 (POSCO 기술연구소 제강연구그룹) ;
  • 이성학 (포항공과대학교 항공재료연구센터) ;
  • 김낙준 (포항공과대학교 철강대학원)
  • Sung, Hyo Kyung (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Shin, Sang Yong (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Cha, Wooyeol (Steelmaking Research Group, Technical Research Laboratories, POSCO) ;
  • Oh, Kyungshik (Steelmaking Research Group, Technical Research Laboratories, POSCO) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Kim, Nack J. (Graduate Institute of Ferrous Technology, Pohang University of Science and Technology)
  • 투고 : 2010.03.17
  • 발행 : 2010.10.22
⟨ 이전 논문 다음 논문 ⟩

초록

This study assessed the Charpy impact properties of the heat-affected zones (HAZs) of API X80 linepipe steels containing complex oxides. Three types of steel were fabricated by adding Mg and $O_2$ to form complex oxides and their microstructures and Charpy impact properties were investigated. The number of complex oxides increased with the amount of excess Mg and $O_2$ that was included in the steels. Simulated HAZs containing a number of oxides showed a high volume fraction of acicular ferrite (AF) because the oxides acted as nucleation sites for AF, thereby leading to an improvement in the Charpy impact properties. According to a correlation study between the heat input, the volume fraction of the AF, and the Charpy impact properties, ductile fractures occurred predominantly when the fraction of the AF was 20% or higher; moreover, the Charpy absorbed energy was excellent at more than 100 J. These findings suggest that the improvement of the Charpy impact properties of the HAZs was associated with the active nucleation of AF in the oxide-containing steel HAZs.

키워드

과제정보

연구 과제 주관 기관 : POSCO, 한국과학재단

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