WEAR CHARACTERISTICS OF NITROGENATED CHROMIUM CAST IRONS

The effect of only nitrogen and of both nitrogen and titanium together on the abrasive wear resistance of quenched and tempered 12 wt.% Cr c ast irons has been evaluated using a modified pin-on-disc machine in w hich the experimental samples slid under load (22-66 N) against a bond ed alumina wheel. The results indicate that the nitrogen addition impr oves the wear resistance of chromium cast irons provided that the reta ined austenite content is low (less than 10%). High retained austenite contents lead to deterioration in the wear resistance irrespective of the chromium-to-carbon ratio.