EDP Sciences Journals List
Issue J. Phys. IV France
Volume 10, Number PR6, April 2000
The Sixth Japan-France Materials Science Seminar
JFMSS-6
Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
Page(s) Pr6-105 - Pr6-110
DOI http://dx.doi.org/10.1051/jp4:2000618

The Sixth Japan-France Materials Science Seminar
JFMSS-6
Microstructural Design for Improved Mechanical Behaviour of Advanced Materials

J. Phys. IV France 10 (2000) Pr6-105-Pr6-110

DOI: 10.1051/jp4:2000618

Ultrafine-grain ferrite steel and its mechanical properties

K. Nagai

National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan


Abstract
Ultrafine-grain ferrite steel with the ferrite grain size of less than one micron has been created though heavy deformation at higher temperature regime of ferrite phase for a low carbon Si-Mn steel. It shows a very good balance of high yield strength and low DBTT in Charpy impact test. However, higher strength steel suffers from lower ductility or easier plastic instability. In order overcome the low ductility, strain hardening rate is raised by an adequate dispersion of iron carbides.



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