High temperature wear and corrosion resistance of a Laves phase strengthened Co–Mo–Cr–Si alloy

Abstract

A new alloy designated as T-400C comprising of (in wt.%) 14.0Cr, 26.0Mo, 2.6Si, and balance Co with excellent wear resistance and corrosion resistance is developed based on average electron hole number and average d-electron density calculations, and thermal gravitational analysis. Cylinder-on-flat and disc-on-flat wear tests against nitrided 310 stainless steel flat specimens have been carried out at 482 °C using a Cameron–Plint test machine. Immersion corrosion test is conducted in 65% HNO 3 oxidizing acid at 66 °C, in 10% H 2SO 4 reducing acid at 102 °C and in 5% HCl reducing acid at 66 °C to evaluate the general corrosion resistance of the developed alloy. Alloy T-400C demonstrated better wear resistance and excellent corrosion resistance as compared to a common commercial alloy T-400 with a nominal chemical composition of 8.5% Cr, 28.5% Mo, 2.6% Si and the balance Co.