J. Phys. IV France
Volume 112, October 2003
Page(s) 285 - 288

J. Phys. IV France
112 (2003) 285
DOI: 10.1051/jp4:2003884

Low temperature bainite

C. Garcia-Mateo1, F.G. Caballero2 and H.K.D.H. Bhadeshia1

1  University of Cambridge, Department of Materials Science and Metallurgy, Pembroke Street, Cambridge CB2 3QZ, U.K.
2  Centro Nacional de Investigaciones Metalurgicas (CENIM), Consejo Superior de Investigaciones Cientificas (CSIC), Avda. Gregorio del Amo 8, 28040 Madrid, Spain

It is demonstrated that bainite can be obtained by isothermal transformation at a temperature which is so low that the calculated diffusion distance of an iron atom, over the time scale of the experiment, is many orders of magnitude less than an interatomic spacing; and yet, it is possible to obtain plates of bainite which are a few micrometers in length. Bainite has been obtained by isothermal transformation at 400 K. The time taken for nucleation at this temperature can be many days, but the transformation results in the growth of extremely thin platelets of bainite, so thin that the hardness of the resulting steel can be greater than 600HV.

© EDP Sciences 2003