Nitrided mo alloy worked material having high corrosion...

Details Nitrided mo alloy worked material having high corrosion... Nitrided mo alloy worked material having high corrosion...

C - Chemistry, Metallurgy

23

C

C23C 8/24 (2006.01) C22C 27/04 (2006.01) C23C 8/02 (2006.01) C23C 26/00 (2006.01)

Patent

CA 2480787

A nitrided Mo alloy worked material having high corrosion resistance, high strength and high toughness, characterized in that it comprises a base Mo alloy worked material and, dispersed in the inside thereof, fine nitride particles having been formed by the nitriding of a metal element capable of forming a nitride present in the inside of the Mo alloy worked material and, formed on the surface thereof, a Mo nitride layer having been formed by the nitriding of a worked structure or a recovered structure on the surface; and a method for producing the nitrided Mo alloy worked material which comprises subjecting an alloy worked material containing Mo as a base phase and at least one of Ti, Zr, Hf, V, Nb and Ta as a solute of a solid solution to an internal nitriding with gradually elevating temperatures, and then subjecting the resultant product to an external nitriding. The nitrided Mo alloy worked material is novel and exhibits satisfactorily high corrosion resistance and a high strength under an ultra-severe conditions, such as in a boiled conc. sulfuric acid solution (for example, an aqueous 75 % H2SO4 solution at 180~C), and further, has a high strength at an elevated temperature and also a high toughness at a low temperature, which properties have never seen in the conventional materials.

L'invention porte sur un alliage de Mo nitruré ouvré présentant une bonne résistance à la corrosion, une grande résistance mécanique et une forte ténacité, consistant en un alliage de base de Mo à l'intérieur duquel sont dispersées de fines particules de nitrure obtenues par nitruration d'un métal et capables de se disperser dans l'alliage de base ouvré, et une couche de nitrure de Mo formée à la surface de l'alliage de base obtenue par nitruration d'une structure ouvrée ou d'une structure recouvrant ladite surface. L'invention porte également sur un procédé d'obtention dudit alliage de Mo nitruré ouvré consistant: à soumettre l'alliage de base de Mo et au moins un métal choisi parmi Ti, Zr, Hf, V, Nb et Ta, sous forme de soluté d'une solution solide, à une nitruration interne en élevant graduellement la température, puis à soumettre le produit résistant à une nitruration extérieure. L'alliage de Mo nitruré ainsi obtenu est nouveau et présente: une résistance à la corrosion satisfaisante et une grande résistance mécanique dans des conditions ultra sévères telles que dans une solution concentrée bouillante d'acide sulfurique (par exemple une solution aqueuse à 75 % de H¿2?SO¿4? à 180·C), ainsi qu'une grande résistance mécanique à haute température et une grande ténacité à basse température, ces propriétés n'ayant jamais atteintes par des matériaux usuels.

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