J. Phys. IV France
Volume 112, October 2003
Page(s) 441 - 444

J. Phys. IV France
112 (2003) 441
DOI: 10.1051/jp4:2003920

Iron alloys with new functional properties obtained during reverse martensitic transformation

V.V. Sagaradze1, V.E. Danilchenko2, P. L'Heritier3 and I.V. Sagaradze1

1  Institute of Metal Physics, Ural Branch RAS, 18 S. Kovalevskaya Str., 620219 Ekaterinburg, Russia
2  Institute of Metal Physics NASU, Kiev, Ukraine
3  National Polytechnical Institute of Grenoble, Grenoble, France

It was shown that different types of the austenite (homogeneous and inhomogeneous polyhedral, or submicrocrystalline and nanocrystalline plate austenite) can be formed, providing new functional properties of various steels and alloys. The austenite formed during a partial $\alpha\to\gamma$ transformation increases considerably the strength of the martensite, enhances the coercive force and improves the square shape of the hysteresis loop of maraging steels. The thermal expansion coefficient of the austenitic alloy type 32Ni can be adjusted over broad limits thanks to different $\alpha\to\gamma$ transformation conditions. A stainless steel with a structure of alternating laths of the martensite and the austenite has a high resistance to radiation void formation.

© EDP Sciences 2003