Composite preform having a controlled fraction of porosity...

B - Operations – Transporting – 22 – F

Patent

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B22F 7/08 (2006.01) B22F 5/10 (2006.01)

Patent

CA 2725311

The invention provides clad billet for hot working plastic deformation processes for the production of clad products, including, but not limited to, clad pipe and tubing by extrusion of a hollow, bicomponent composite billet having a fully dense structural component and a partially dense component of a specialty alloy at a fraction of porosity predetermined to provide a flow stress compatible with that of the structural component. The components are diffusion bonded to the predetermined fraction of porosity in the specialty component by application of heat and pressure over time, including by hot isostatically pressing the billet components. Computer modeling techniques can be used to determine processing conditions for obtaining flow stress compatibility.

L'invention concerne un lopin revêtu destiné à des processus de formage à chaud par déformation plastique pour la production de produits revêtus et comprenant, de façon non limitative, des tuyaux et des tubes revêtus par extrusion dun lopin composite creux à deux composants comprenant un composant structural de pleine densité et un composant de densité partielle constitué dun alliage de spécialité à un taux de porosité prédéterminé de façon à donner une charge découlement compatible avec celle du composant structural. Les composants sont soudés par diffusion au taux prédéterminé de porosité dans le composant de spécialité par application de chaleur et de pression sur une certaine durée, notamment par pressage isostatique à chaud des composants du lopin. Des techniques de modélisation informatique peuvent être utilisées pour déterminer les conditions de traitement en vue dobtenir la compatibilité de la charge découlement.

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