Laser fabrication of discontinuously reinforced metal matrix...

B - Operations – Transporting – 22 – F

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B22F 3/105 (2006.01) B22F 7/04 (2006.01) C04B 35/111 (2006.01) C04B 35/653 (2006.01)

Patent

CA 2391933

Disclosed are reinforced metal matrix composites and methods of shaping powder materials to form such composites. Articles of manufacture are formed in layers by a laser fabrication process. In the process, powder is melted and cooled to form successive layers of a discontinuously reinforced metal matrix. The matrix exhibits fine grain structure with enhanced properties over the unreinforced metal, including higher tensile modulus, higher strength, and greater hardness. In some preferred embodiments, an in-situ alloy powder, a powder metallurgy blend, or independently provided powders are reinforced with boron and/or carbon to form the composite.

L'invention concerne des composites à matrice métal renforcée, ainsi que des procédés de façonnage de matières pulvérulentes, afin de former lesdits composites. Des articles manufacturés sont façonnés en couches par processus de fabrication laser. Selon ce procédé, de la poudre est fondue et refroidie afin de former des couches successives d'une matrice métal renforcée de manière discontinue. Cette matrice présente une structure à grain fin aux propriétés améliorées par rapport à celle d'un métal non renforcé, y compris un plus grand module d'élasticité en traction, une plus grande résistance et une meilleure dureté. Dans certains modes de réalisation préférés, une poudre alliée in-situ, un mélange de la métallurgie des poudres ou des poudres prévues indépendamment sont renforcés par du bore et/ou du carbone afin de former le composite.

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