Kyoto University · 공학
Sukyoung Hwang 교수의 연구실은 고망간 페라이트계 스틸의 미세구조와 기계적 거동 간의 상관관계를 중심으로, 고강도·고 ductility를 동시에 확보한 신소재 개발에 초점을 맞추고 있습니다. 특히 디지털 이미지 상관법(DIC), 동기광선 X선 衍射 및 전자현미경 분석을 융합한 다중 척도 분석 기법을 활용해, 레이저 변형, Lüders 변형, Portevin-Le Chatelier 효과 등 비균일 응력-변형 거동의 메시오스코픽 기반을 규명하고 있습니다. 또한 플라즈마 기반 페인팅법을 통한 폴리머 박막 성장 동역학에 대한 연구를 통해 나노구조 편성 및 표면 기능화 기술도 함께 발전시키고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
We have thoroughly clarified the mesoscopic nature of serration behavior in a high-Mn austenitic steel in connection with its characteristic localized deformation. A typical high-Mn steel, Fe-22Mn-0.6C (wt. %), with a face centered cubic (FCC) single-phase structure was used in the present study. After 4 cycles of repeated cold-rolling and annealing process, a specimen with a fully recrystallized microstructure having a mean grain size of 2.0 μm was obtained. The specimen was tensile tested at r
The growth kinetics of polymer thin films prepared by plasma-based deposition method were explored using atomic force microscopy. The growth behavior of the first layer of the polythiophene somewhat differs from that of the other layers because the first layer is directly deposited on the substrate, whereas the other layers are deposited on the polymer itself. After the deposition of the first layer, each layer is formed with a cycle of 15 s. The present work represents the growth kinetics of th
Ultrafine-grained (UFG) high-Mn austenitic steel exhibited unusual discontinuous yielding on its stress-strain curve, characterized by a yield drop followed by a stress plateau, indicative of Lders deformation. Utilizing the digital image correlation (DIC) technique, a strain-localized region known as a Lders band was observed to propagate during Lders deformation. Following microstructural observations using state-of-the-art techniques such as in-situ synchrotron XRD measurement during the tens
• PLC banding behavior was analyzed under varying grain sizes in 22Mn-0.6C steels. • DIC and in-situ synchrotron XRD were combined to assess local deformation behavior. • Grain refinement promoted homogeneous deformation across the entire gage part. • Temporary necking in PLC bands was overcome through local strain hardening. Dynamics of Portevin-Le Chatelier (PLC) banding were thoroughly revealed through grain refinement in high-Mn austenitic steel. Fully recrystallized 22Mn-0.6C steels (wt%),
Ecology is that the study of organisms and therefore the environment interacting with each other . Ecologists, who structure a neighborhood of environmental scientists, attempt to find relations between the status of the environment and therefore the population of a specific species within that environment
