Method for producing powder metal materials

Details Method for producing powder metal materials Method for producing powder metal materials

B - Operations, Transporting

22

F

B22F 3/12 (2006.01) B22F 1/00 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2420531

A method for producing a material includes providing a metallurgical powder including iron, 1.0 to 3.5 weight percent copper, and 0.3 to 0.8 weight percent carbon. At least a portion of the powder is compressed at 20 tsi to 70 tsi to provide a compact, and subsequently the compact is heated at high temperature and then cooled at a cooling rate no greater than 60 ~F per minute to increase the surface hardness of the compact to no greater than RC 25. The density of at least a region of the sintered compact is increased, by a mechanical working step or otherwise, to at least 7.6 grams/cc. The sintered compact is then re-heated to high temperature and cooled at a cooling rate of at least 120 ~F/min. so as to increase the surface hardness of the compact to greater than RC 25, and preferably at least RC 30. Material made by the method of the invention also is disclosed.

L'invention porte sur un procédé de production de poudre métallique comportant de 1,0 à 3,5 % en poids de Fe, et de 0,3 à 0,8 % en poids de C. A cet effet: (i) on comprime au moins une partie de la poudre sous 20 à 70 tsi pour obtenir une masse compacte; (ii) on porte ladite masse à une forte température; (iii) on refroidit ladite masse à une vitesse ne dépassant pas 60 ·F min de manière à porter sa dureté superficielle jusqu'à moins de RC 25; (iv) on porte la densité d'au moins une partie de la masse frittée à au moins 7,6 grammes/c.c. par un procédé mécanique ou autre; (v) on reporte la masse frittée à une température élevée; (vi) puis on la refroidit à nouveau à une vitesse d'au moins 120 ·F min pour en porter la dureté superficielle à plus de RC 25, ou mieux à au moins RC 30. L'invention porte également sur le produit ainsi obtenu.

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