5/7(一)專題演講公告

 2018-5-2

演講者Tadashi Furuhara 教授

服務單位東北大學金屬材料研究所

演講題目Light Element Strategy in Advanced High Strength Steels

演講時間10757(星期一) 早上1020

演講地點工綜館203國際演講廳

簡介

 

Tadashi Furuhara received the degrees of BE (1983) and ME (1985) in Metal Science and Technology from Kyoto University, Japan and PhD (1989) in Metallurgical Engineering and Materials Science from Carnegie Mellon University, USA. In 1989, he joined, as a faculty, Department of Metal Science and Technology at Kyoto University. In 2005, he moved to Institute for Materials Research at Tohoku University as Professor of Microstructure Control in Structural Metallic Materials Laboratory. His major research interests have been in the physical metallurgy and microstructure/property control of alloys including steels, titanium alloys, etc. He has published over 200 papers in refereed scientific journals and co-authored 15 books. His work has been recognized by various awards, including Tanigawa-Harris Award of Japan Institute of Metals and Materials (2015), Technology Award of Japan Titanium Society (2006), Nishiyama Memorial Award of Iron and Steel Institute of Japan (2000), and Vanadium Award of Institute of Materials, Minerals and Mining (UK) (2005, 2016). Prior to his appointment as an editor of Acta/Scripta Materialia in 2017, he served as editorial board members of several journals, including a board of review of Metallurgical and Materials Transactions A, an editorial board of Materials Science and Engineering A, an associate editor of ISIJ International, and an editor-in-chief of Materia Japan.

 

演講摘要

Saving of rare metal elements for development of metals and alloys are important for sustainable development of our modern society with natural resource limits. In particular, such a concept has great impacts in research and development of advanced steels because quite high fractions of rare metal elements are spent in steel production. Under the 4Re concept ('Replace', 'Reduce', 'Recycle' and 'Restriction'), 'Element Strategy' has been one of the most important guideline in strategic research on materials science funded by Japanese government for more than 10 years. Among light elements in the periodic table, which are in general rich on the earth, interstitial elements such as carbon or nitrogen are known to be quite effective for obtaining high strength in steel. However, there are still lots of unclarified issues for interaction between interstitial elements and substitutional (mostly rare metal) elements. Deeper understanding of its fundamentals should lead to more efficient usage of rare metal elements in design of advances high strength steels.

In this talk, our recent research based on 'light element strategy' in low-alloy high strength steels is described. Two examples will be mainly introduced: (1) microstructure controls of high strength multiphase steels related to mesoscale partitioning of carbon, and (2) fundamental principles in surface hardening design in nitriding of low alloy steels. Effects of interaction of interstitial and substitutional elements on non-equilibrium phase transformation or precipitation, which is a key factor for large strengthening, will be discussed.

2018-5-7 Prof Tadashi Furuhara