Iron base high temperature alloy

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/18 (2006.01) C21D 6/02 (2006.01) C22C 27/06 (2006.01) C22C 38/06 (2006.01) C22C 38/36 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2399552

The present invention is directed to an iron, aluminum, chromium, carbon alloy and a method of producing the same, wherein the alloy has good room temperature ductility, excellent high temperature oxidation resistance and ductility. The alloy includes about 10 to 70 at.% iron, about 10 to 45 at.% aluminum, about 1 to 70 at.% chromium and about 0.9 to 15 at.% carbon. The invention is also directed to a material comprising a body-centered-cubic solid solution of this alloy, and a method for strengthening this material by the precipitation of body-centered-cubic particles within the solid solution, wherein the particles have substantially the same lattice parameters as the underlying solid solution. The ease of processing and excellent mechanical properties exhibited by the alloy, especially at high temperatures, allows it to be used in high temperature structural applications, such as a turbocharger component.

La présente invention concerne un alliage à base de fer, d'aluminium, de chrome, et de carbone ainsi que le procédé de production correspondant. En l'occurrence, cet alliage se distingue par sa ductilité à température ambiante, sa résistance à l'oxydation et sa ductilité à hautes températures. Cet alliage est fait de 10% à 70% atomique de fer, de 10% à 45% atomique d'aluminium, de 1% à 70% atomique de chrome, et d'environ 0,9% à 15% atomique de carbone. L'invention concerne aussi un matériau contenant une solution solide cubique centrée de cet alliage, et un procédé de renforcement de ce matériau par précipitation de particules à l'intérieur de la solution solide, les particules ayant sensiblement les mêmes paramètres de système que la solution solide sous-jacente. De par sa très bonne aptitude au traitement et ses excellentes propriétés mécaniques, particulièrement aux hautes températures, cet alliage convient particulièrement à l'emploi dans le cadre d'applications de structures hautes températures, notamment comme composant des turbopompes d'injection.

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