Kyushu University · Engineering
Abbas Mohammadi 교수의 연구실은 고엔트로피 합금과 이종금속 용접에서의 거친 미세구조 변화 및 수소 유도 피로열화 거동을 중심으로 연구를 진행하고 있습니다. 특히, 고압 토크 변형, 수소 충전을 통한 균열 성장 거동, 그리고 용접 후 열처리 조건이 미세구조와 피로 수명에 미치는 영향을 실험적·이론적 방법으로 분석하고 있습니다. 연구는 주로 고강도 철강 및 고성능 합금의 안전성 향상에 초점을 맞추고 있습니다.
Figures are computed from collected data and may differ slightly.
Following the introduction of high-entropy alloys (HEAs) with five or more principal elements, dual-phase HEAs have recently received significant attention due to their promising mechanical properties. Theoretical simulations suggest that unique mechanical properties of these alloys arise due to the contribution of localized phase transformation and diverse microstructural behavior of two phases under plastic deformation. In this study, phase transformations and microstructural evolution in a du
Hydrogen-assisted crack growth of pre-strained twinning-induced plasticity (TWIP) steel was investigated using artificial defects (micro-drilled holes), which acted as artificial crack initiation sites. Hydrogen was introduced into the specimens by electrochemical hydrogen charging during slow strain rate tensile test. The quasi-cleavage crack propagation observed was due to repeated crack initiation near the crack tip and subsequent coalescence. Crack initiation near the crack tip occurred afte
Abstract ASME Case N-888, Similar and Dissimilar Metal Welding Using Ambient Temperature SMAW and Machine GTAW Temper Bead Technique, requires a 48-hour hold time before nondestructive examination (NDE) can be performed to ensure hydrogen induced cracking (HIC) did not occur. The objective of this work is to evaluate the effect of postweld heat treatment (PWHT) and temper bead welding (TBW) on the HIC susceptibility in the coarse-grained heat affected zone (CGHAZ) in welds of SA-508 pressure ves
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