Ultra-steel : Fabrication Makes New Material Structure(Synergy by Microstructuring)

概要

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Ultrafine grained steels were developed in lab scale and/or in a practical process. A basic approach has been performed to explore the evolution mechanisms of ultrafine grained microstructures. Two approaches have been investigated to make the ultrafine grains:the "recrystallization route" and the transformation route. In the "recrystallization" route, heavy deformation at low temperature is necessary for the ultra-refinement. In the transformation route making the high density of ferrite initiation sites in the deformed austenite, especially of the heavily compressed austenite structures, is essential for the ultra-refinement and further hindering the ferrite growth is also inevitable to utilize the high initiation rate. Strength and toughness are dramatically improved by the ultra-refinement. Fatigue property is also excellent. The poor uniform elongation can be enhanced by the design of the second phase dispersion.At the same time, the application has also been pursued from various viewpoints of engineering to take advantage of the ultrafine grained steels.
一般社団法人日本機械学会の論文
2006-09-19