해양 구조물용 고장력강의 해수 내 저변형률 인장속도에 따른 응력부식균열 특성 연구
Investigation on Stress Corrosion Cracking Characteristic with Slow Strain Rate in Sea Water of High-Strength Steel for Marine Structures
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This research explores the stress corrosion cracking (SCC) behavior of AH32 high-strength steel under slow strain rates by comparing its performance in air and seawater environments. Optical microscope observations revealed that the high-strength steel has a ferrite–pearlite microstructure, with pearlite concentrated in specific regions. This microstructural inhomogeneity likely influences the formation of micro-galvanic cells and areas of stress concentration, contributing to the onset of SCC. Slow strain rate tests were performed at rates of 0.004, 0.001, and 0.00075 mm/min. The results showed that in seawater, as the strain rate decreased, there were greater reductions in elongation, time to fracture and absorbed energy. Fracture surface analysis revealed cleavage planes under seawater conditions, indicating a brittle fracture behavior of the material. In contrast, specimens tested in air exhibited ductile fracture characteristics, such as dimples and shear lips. These findings suggest that the seawater environment significantly facilitates the initiation and propagation of SCC in high-strength steel.
Abstract
This research explores the stress corrosion cracking (SCC) behavior of AH32 high-strength steel under slow strain rates by comparing its performance in air and seawater environments. Optical microscope observations revealed that the high-strength steel has a ferrite–pearlite microstructure, with pearlite concentrated in specific regions. This microstructural inhomogeneity likely influences the formation of micro-galvanic cells and areas of stress concentration, contributing to the onset of SCC. Slow strain rate tests were performed at rates of 0.004, 0.001, and 0.00075 mm/min. The results showed that in seawater, as the strain rate decreased, there were greater reductions in elongation, time to fracture and absorbed energy. Fracture surface analysis revealed cleavage planes under seawater conditions, indicating a brittle fracture behavior of the material. In contrast, specimens tested in air exhibited ductile fracture characteristics, such as dimples and shear lips. These findings suggest that the seawater environment significantly facilitates the initiation and propagation of SCC in high-strength steel.