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논문 기본 정보

자료유형
학술저널
저자정보
Dongki Choi (Inha University) Hun Lee (University of Ulsan) Sung‑Kyu Cho (Hyundai Steel Company) Hyoung Chan Kim (Korea Institute of Industrial Technology) Soong‑Keun Hyun (Inha University) Sang Yong Shin (University of Ulsan)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.26 No.6
발행연도
2020.1
수록면
867 - 881 (15page)

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In this study, heat affected zone (HAZ) specimens were fabricated by applying flux-cored arc welding (FCAW) and submergedarc welding (SAW) processes to steel plate with a thickness of 100 mm and yield strength of 460 MPa for use in offshoreplatforms. The correlation between microstructure and Charpy absorbed energy was investigated, and fracture mechanismswere analyzed. As distance from the fusion line increases, heat input and cooling rate decrease, making it difficult to formlow-temperature transformation microstructures in HAZ specimens and increasing the grain size of quasi-polygonal ferrite. The FCAW process is advantageous for low-temperature transformation microstructures because it has a lower heat inputand a faster cooling rate than the SAW process. Plastic deformation and ductile fracture occurred at low temperatures infine acicular ferrite and quasi-polygonal ferrite regions of HAZ specimens, but brittle fractures occurred in bainitic ferrite,granular bainite, and coarse quasi-polygonal ferrite regions. The unit crack path in the brittle fracture region was similar tothe grain size. In other words, as the volume fraction of fine acicular ferrite and quasi-polygonal ferrite increased in HAZspecimens, Charpy absorbed energy at low temperature increased.

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