C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/24 (2006.01) C22C 27/04 (2006.01) C23C 8/02 (2006.01) C23C 8/26 (2006.01) C23C 26/00 (2006.01)
Patent
CA 2480794
A high strength and high toughness Mo alloy worked material, characterized in that it is produced through subjecting a Mo alloy worked material comprising an Mo base phase and, incorporated in the form of a solid solution with the Mo phase, a metal element capable of forming a nitride and, precipitated and dispersed in the Mo phase, at least one of carbide particles, oxide particles and boride particles to an internal nitriding, and fine nitride particles are also dispersed in addition to the at least one of carbide particles, oxide particles and boride particles; and a method for producing the above novel material which comprises subjecting an alloy worked material comprising an Mo base phase and, precipitated and dispersed therein, at least one of carbide particles, oxide particles and boride particles and, incorporated in the form of a solid solution with the Mo phase, at least on of Ti, Zr, Hf, V, Nb and Ta to a multi-step internal nitriding wherein the treatment temperature is stepwise elevated. The high strength and high toughness Mo alloy worked material can be used at a temperature higher than the temperature at which conventional TZ alloy is used.
L'invention porte sur un alliage de Mo ouvré présentant une grande résistance mécanique et une forte ténacité, obtenu en soumettant à une nitruration interne: un alliage de Mo ouvré comportant une phase de base de Mo; au moins un élément métallique sous forme de solution solide; et des particules de carbure, et/ou d'oxyde et/ou de nitrure, précipitées et dispersées dans la phase de Mo; puis en y dispersant de fines particules de nitrure s'ajoutant à celles ci-dessus. L'invention porte également sur un procédé d'obtention dudit nouvel alliage consistant: à soumettre l'alliage ouvré, lesdites particules de carbure, et/ou d'oxyde et/ou de borure, et au moins un métal choisi parmi Ti, Zr, Hf, V, Nb et Ta, sous forme de solution solide avec la phase Mo, à une nitruration interne en plusieurs étapes en élevant la température par paliers. L'alliage de Mo ouvré ainsi obtenu présente une grande résistance mécanique, et une grande ténacité à des températures plus élevées que celles d'utilisation des alliages usuels de TZ.
Hoshika Tetsushi
Nagae Masahiro
Nakanishi Makoto
Takada Jun
Takida Tomohiro
A.l.m.t. Corp.
Japan Science And Technology Agency
Kirby Eades Gale Baker
National University Corporation Okayama University
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