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해양플랜트용 후판강의 FCAW HAZ 미세조직과 샤르피 충격 특성의 상관관계
이훈,이현욱,조성규,최동기,김형찬,권용재,이정구,신상용,Lee, Hun,Lee, Hyunwook,Cho, Sung Kyu,Choi, Dongki,Kim, Hyoung Chan,Kwon, Yongjai,Lee, Jung Gu,Shin, Sang Yong 한국재료학회 2019 한국재료학회지 Vol.29 No.8
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 $-20^{\circ}C$ 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 $-60^{\circ}C$ 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.