Room temperature hardness of carbides-strengthened cast alloys in relation with their carbon content and the aging temperature. Part I: Case of nickel alloys
Résumé
The addition of hard particles in a ductile alloy may lead to a substantial increase in its hardness and in the difficulty to machine it. This work aims to specify the role of chromium carbides in the hardness of cast nickel alloys. A Ni-30 wt.%Cr alloy and six {0 to 2 wt.%C}-containing alloys based on the first one, were elaborated by foundry. Their microstructures after aging at 1,000, 1,100 and 1,200°C were described, and the room temperature Vickers hardness of all alloys for the three aging treatments was measured. Hardness increases with carbon content following a curve which is almost parabolic, while it increases more linearly versus the volume fraction of carbides. Hardness is generally lowered by choosing higher aging temperature. The evolution of hardness was compared with a law of mixture based on the hardness and the volume fractions of the matrix and of the carbides.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...