High melting point metal based alloy material having high...

C - Chemistry – Metallurgy – 23 – C

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C23C 8/24 (2006.01) C22C 27/04 (2006.01) C22C 27/06 (2006.01)

Patent

CA 2373346

A high melting point metal based alloy material which is producedby a method wherein a metal element for forming a nitride contained as a component of a solid solution in an alloy-forming material having one metal of Mo, W and Cr as a master phase is subjected to an internal nitriding at a low temperature of a higher most recrystallization temperature or lower, to thereby incorporating ultra fine nitride particles dispersed therein and thus increasing a lower most recrystallization temperature of the alloy-forming material, and the internally nitrided material is subjected to a second nitriding treatment at a temperature of its lower most recrystallization temperature or higher, to thereby grow ultra fine precipitated particles of a nitride with at least surface side of the material maintaining the deformation texture of the master phase, and form a stabilized structure. The alloy material exhibits markedly an improved toughness and strength.

L'invention porte sur le matériau d'un alliage métallique à point de fusion élevé obtenu par un procédé dans lequel l'élément métallique destiné à former un nitrure constituant l'un des composants d'une solution solide du matériau formant l'alliage, et dont la phase principale est faite de Mo, de W ou de Cr, est soumis à une nitruration interne à basse température correspondant à sa température de recristallisation la plus élevée ou moins, puis on lui incorpore des particules ultrafines de nitrure qui y sont dispersées, ce qui accroît la température de recristallisation la plus basse du matériau formant l'alliage, puis on soumet le matériau nitruré intérieurement à une deuxième nitruration à sa température de recristallisation la plus basse ou plus pour y développer des particules précipités ultrafines de nitrure, le côté surface du matériau conservant la texture de déformation de la phase principale et formant une structure stabilisée. L'alliage présente nettement une ténacité et une résistance améliorées.

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