Effect of nitrogen on the microstructure and mechanical properties of a CoCrMo alloy

✍ Scribed by José Escobedo; Juan Méndez; Dora Cortés; Juan Gómez; Manuel Méndez; Héctor Mancha

• Publisher: Elsevier Science
• Year: 1996
• Weight: 912 KB
• Volume: 17
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(96)00036-2

✦ Synopsis

The effect of nitrogen on the microstructure and mechanical properties of a cobalt base alloy was studied. The treatments were carried out for contact times of 0, 15, 30, 45 and 55 min, between the gas and the liquid metal. The treatment temperature was 1723 K at a nitrogen pressure of 0.67 atm. The results showed that as the nitrogen content increased, the tensile and fatigue strengths increased, the hardness increased slightly and the ductility decreased. The metallographic analysis showed that the nitrogen content had little effect on the grain size. When the nitrogen content in the alloy was increased, the formation of finer carbides of the M,C type was promoted ahead of the M2sCs type. The fine carbides tended to accumulate along the grain boundaries.