Kyoto University · Engineering
Professor Sukyoung Hwang's research lab specializes in the microstructure-property relationships in advanced metallic materials, with a primary focus on high-Mn austenitic steels. The lab investigates deformation mechanisms such as Lüders banding, Portevin-Le Chatelier (PLC) effects, and strain localization using advanced in-situ characterization techniques like digital image correlation (DIC), synchrotron XRD, and electron microscopy. A key research direction involves understanding how grain refinement and microstructural evolution influence plasticity and deformation heterogeneity in structural alloys. The lab also explores plasma-polymerized thin film growth kinetics, extending its expertise into functional thin films for potential applications in coatings and surface engineering.
Figures are computed from collected data and may differ slightly.
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
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