20Invited Talk NA-5Recent advances in high-strength steels for automobile applications or surface-hardened steels have attracted interest on controlling the nanoscale dispersion of alloy carbides/nitrides in ferrite. Particularly, B1-type carbide/nitride precipitation and metastable alloy clustering can be understood as the coupled ordering and compositional phase separation of interstitial alloying elements "i" and substitutional alloying elements "s". In this presentation, the behavior of i–s clustering and alloy carbide/nitride precipitation is introduced based on nanoscale characterization, theoretical calculations, and evaluations of mechanical properties. It is shown that strong i–s attractive interaction is responsible for metastable i–s clustering, which clearly indicated "hidden" nanoscale inhomogeneity in solid solutions. Further, a concept termed interstitial sublattice engineering in bulk and at interphase boundary for designing high strength steels will be discussed.PhotoPhotoSublattice Alloy Design for Application of Solute Clustering Professor, Institute for Materials Research, Tohoku University, JapanAbstract Tadashi Furuhara is a Professor, Tohoku University. He obtained his Bachelor and Master of Engineering degrees from Kyoto University, Japan. After he graduated with his Ph.D degree from Carnegie Mellon University, USA, he joined the faculty of engineering,Kyoto University in 1989 and made research and education as an assistant and associate professor. Then he became a professor at Tohoku University in 2005. His research activity covers a broad area in physical metallurgy of steels and non-ferrous alloys, such as phase transformations and precipitation, deformation and recrystallization, microstructure control by thermo-mechanical and thermo-chemical processings.He also actively contributes to various academic societies in metallurgy field. He served as a Vice President of JIM between 2016-19 and is currently the President of ISIJ. He is also an editor of Acta and Scripta Materialia.NIMS Award Symposium 2023in High-strength SteelsTadashi FuruharaNIMS Award Session
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