High density forming process with ferro alloy and prealloy

Details High density forming process with ferro alloy and prealloy High density forming process with ferro alloy and prealloy

B - Operations, Transporting

22

F

B22F 3/16 (2006.01) B22F 3/12 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2254918

A method for making a high density powdered metal article is provided. The composition consists of iron based powder, lubricant, graphite and ferro alloy additions. Satisfactory results may also be achieved by using prealloyed molybdenum grades of metal powders. The composition is compacted in rigid tools at ambient temperature, sintered at high temperature and then formed in rigid tools comprising a clearance (22) for movement of the sintered compact to final shape, at 40 to 90 tons per square inch to a density greater than 94 % of theoretical. The high density article is then annealed. The final article demostrates remarkable mechanical properties which are atypical of powdered metal components and approach those of wrought steel.

L'invention porte sur un procédé de fabrication d'articles frittés à haute densité dont la composition comprend de la poudre à base de fer, un lubrifiant, et des adjonctions de graphite et ferroalliage. Des résultats satisfaisants peuvent être obtenus avec des poudres métalliques préalliées à teneur en molybdène. La composition est compactée dans des outils rigides à la température ambiante, puis frittée à haute température, puis comprimée dans des outils rigides avec un jeu (22) permettant à la poudre compactée de prendre sa forme définitive sous 40 à 90 tonnes par pouce carré, ce qui l'amène à une densité supérieure à 94 % de la densité théorique. L'article à haute densité subit ensuite un recuit. L'article final présente des propriétés mécaniques remarquables, atypiques des pièces frittées, et voisines de celles de l'acier forgé.

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