Method for forming pearlite in an iron based article

Details Method for forming pearlite in an iron based article Method for forming pearlite in an iron based article

C - Chemistry, Metallurgy

21

D

C21D 6/00 (2006.01) C21D 1/74 (2006.01) C23C 8/22 (2006.01)

Patent

CA 2464657

The present invention is directed to a process for producing pearlite from an iron containing article comprising the steps of, (a) heating an iron containing article comprising at least 50 wt % iron for a time and at a temperature sufficient to convell at least a portion of said iron from a ferritic structure to an austenitic structure, (b) exposing said austenitic structure, for a time sufficient and at a temperature of about 727 to about 900~C, to a carbon supersaturated environment to diffuse carbon into said austenitic structure and ( c ) cooling said iron containing article to form a continuous pearlite structure.

L'invention concerne un procédé de production de perlite dans un article à base de fer consistant (a) à chauffer un article contenant du fer, comprenant au moins 50 % en poids de fer, pendant une durée et à une température suffisante pour faire passer au moins une partie du fer d'une structure ferritique à une structure austénitique, (b) à exposer cette structure austénitique pendant une durée suffisante, et à une température comprise entre 727 ·C environ et 900 ·C environ, à un environnement supersaturé de carbone aux fins de diffusion du carbone dans la structure austénitique, et (c) à refroidir l'article contenant du fer afin de former une structure continue de perlite.

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