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2019 Vol.29, Issue 8 Preview Page
Correlation between Microstructure and Charpy Impact Properties of FCAW HAZ of Thick Steel Plates for Offshore Platforms

해양플랜트용 후판강의 FCAW HAZ 미세조직과 샤르피 충격 특성의 상관관계

Hun Lee1
,
Hyunwook Lee1
,
Sung Kyu Cho2
,
Dongki Choi3
,
Hyoung Chan Kim4
,
Yongjai Kwon1
,
Jung Gu Lee1
,
Sang Yong Shin1†
이 훈1
,
이 현욱1
,
조 성규2
,
최 동기3
,
김 형찬4
,
권 용재1
,
이 정구1
,
신 상용1†
1School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
2Technical Research Center, Hyundai Steel Company, Dangjin 31719, Republic of Korea
3Technical Research Center, Hydrofast, Incheon 21315, Republic of Korea
4Energy Plant R&D Group, Korea Institute of Industrial Technology, Busan 46742, Republic of Korea
1울산대학교 첨단소재공학부
2현대제철 R&D센터
3하이드로훼스트 기술연구소
4한국생산기술연구원 에너지플랜트그룹
†Corresponding author E-Mail : sshin@ulsan.ac.kr (S. Y. Shin, Univ. of Ulsan)
August 2019. pp. 497-504
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Abstract

In this study, the correlation between microstructure and Charpy impact properties of FCAW(Flux cored arc welding) HAZ(Heat affected zone) of thick steel plates for offshore platforms was investigated. The 1/4 thickness(1/4t) location HAZ specimen had a higher volume fraction of bainite and finer grain size of acicular ferrite than those of the 1/2 thickness (1/2t) location HAZ specimen because of the post heat effect during the continuous FCAW process. The Charpy impact energy at -20 °C of the 1/4t location HAZ specimen was lower than that of the 1/2t location HAZ specimen because of the high volume fraction of coarse bainite. The Charpy impact energy at -40 and -60 °C of the 1/2t location HAZ specimen were higher than those of the 1/2t location HAZ specimen because the ductile fracture occurred in the fine acicular ferrite and martensite regions. In the ductile fracture mode, the deformed regions were observed in fine acicular ferrite and martensite regions. In the brittle fracture mode, long crack propagation path was observed in bainite regions.

Keywords
steel
FCAW
HAZ
microstructure
charpy impact properties
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 29
  • No :8
  • Pages :497-504
  • Received Date : 2019-06-19
  • Revised Date : 2019-07-24
  • Accepted Date : 2019-08-04
  • DOI :https://doi.org/10.3740/MRSK.2019.29.8.497
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