京都大学 · 工学
Sukyoung Hwang教授の研究室では、高マンガン鋼をはじめとする金属材料の微細組織と力学的挙動の関係を、デジタル画像相関（DIC）やシンクロトロンX線回折を用いた高精度な実験的手法で解明しています。特に、Lüders帯やPortevin-Le Chatelier帯といった局所化した塑性変形のメカニズムや、微細組織の制御が変形挙動に与える影響を、ナノスケールからマクロスケールまで統合的に解析しています。また、プラズマ堆積法を用いた高分子薄膜の成長動力学についても、AFMを用いた詳細な解析を実施しており、材料設計に応用可能な基礎知見の構築を目指しています。
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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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