Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1987-07-09
1989-03-07
Brody, Christopher W.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148146, 148 12B, C21D 1100
Patent
active
048103110
ABSTRACT:
Starting from a temperature at or above the A.sub.3 transformation point of the steel of the rail, the head of the rail is cooled to a temperature not lower than the Ms point at a rate lower than the critical quenching rate so that the head acquires a fine perlitic structure. Simultaneously the web is superficially cooled to the Ms point or below, at a rate greater than the head, so as to obtain a surface layer of martensite and/or bainite, and the surface cooling is controlled so that, at the end of controlled cooling, internal portions of the web not transformed to martensite and/or bainite retain sufficient heat to temper the surface layer during subsequent cooling to ambient temperature. At the same time the flange of the rail is cooled at a rate ensuring straightness of the rail.
REFERENCES:
patent: 4203783 (1980-05-01), Economopoulos et al.
patent: 4486248 (1984-12-01), Ackert et al.
patent: 4668308 (1987-05-01), Economopoulos et al.
patent: 4714500 (1987-12-01), Heller et al.
Brody Christopher W.
Centre de Recherches Metallurgiques--Centrum voor Research in de
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