Thermomechanical processing of metallic materials

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 8/00 (2006.01) C21D 8/10 (2006.01) C22F 1/08 (2006.01) C22F 1/10 (2006.01)

Patent

CA 2151500

In the fabrication of components from a face centered cubic alloy, wherein the alloy is cold worked and annealed, the cold working is carried out in a number of separate steps, each step being followed by an annealing step. The resultant product has a grain size not exceeding 30 microns, a "special" grain boundary fraction not less than 60 %, and major crystallographic texture intensities all being less than twice that of random values. The product has a greatly enhanced resistance to intergranular degradation and stress corrosion cracking, and possesses highly isotropic bulk properties.

Pour fabriquer des composants à partir d'un alliage cubique à faces centrées qui est formé à froid et recuit, le façonnage à froid s'effectue en plusieurs phases distinctes suivies chacune d'une phase de recuit. Le produit résultant présente une grosseur du grain ne dépassant pas 30 microns, une fraction en limite de grain "spéciale" d'au moins 60 % et des intensités de texture cristallographique majeures qui sont toutes inférieures au double des valeurs aléatoires. Ce produit offre une résistance nettement renforcée à la dégradation intergranulaire et aux fissures de corrosion sous contrainte, ainsi que des propriétés de masse fortement isotropes.

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