Method and apparatus for surface austempering of cast iron...

C - Chemistry – Metallurgy – 21 – D

Patent

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38/15, 148/40

C21D 5/00 (2006.01) C21D 1/44 (2006.01) C21D 1/48 (2006.01) C21D 1/607 (2006.01)

Patent

CA 2031361

A method for producing a selectively surface hardened cast iron part includes uniformly heating the surface of the part by immersion into a molten metallic bath until a desired thickness of surface austenite is produced, and thereafter quenching the heated cast iron part in a liquid quenching bath which is maintained at a temperature of between about 450 to about 800°F for about 10 minutes to about 4 hours. The resultant selectively surface hardened cast iron part is surface hardened with the bulk of the body of the part remaining untempered. An apparatus for performing this process includes a molten metal bath chamber for containing the molten metal and a molten salt bath quenching chamber for quenching the cast iron parts with a conveyor means extending between the molten metal bath and the molten salt bath chambers. A second conveyor means removes the parts from the molten salt bath chamber.

Cette invention concerne une méthode de production d'une pièce en fonte à durcissement superficiel sélectif qui comprend le chauffage superficiel uniforme de la pièce par immersion dans un bain de métal fondu jusqu'à la formation de l'épaisseur voulue d'austénite en surface et, par la suite, la trempe de la pièce en fonte dans un bain de trempe rapide maintenu à une température comprise entre environ 450 degrés Fahrenheit et environ 800 degrés Fahrenheit, pendant une période d'environ 10 minutes à environ 4 heures. Le gros du coeur de la pièce en fonte à durcissement superficiel sélectif ainsi obtenue échappe au traitement de trempe. L'installation servant à réaliser ce procédé comprend une cuve remplie de métal fondu et une cuve de trempe remplie de sels fondus, les deux cuves étant reliées par un transporteur. Un deuxième transporteur sert à évacuer les pièces sortant de la cuve à sels fondus.

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