Enhancing abrasive wear resistance of hybrid multicomponent cast irons by high-temperature quenching

Abstract

In this work, enhancing the tribological characteristics of the novel cast metallic materials – hybrid multi-component cast irons (MCCIs) – by applying a strengthening heat treatment is described [1, 2]. The experimental materials were the cast alloys of a nominal composition (5 wt.% W, 5 wt.% Mo, 5 wt.% V, 10 wt.% Cr, 2.5 wt.% Ti, Fe is a balance) added with 0.3-1.1 wt.% C and 1.5-2.5 wt.% B (total 9 alloys). Heat treatment was an oil-quenching followed by 200 oC-tempering. The quench temperature (QT) was varied in the range of 900-1200 oC with a step of 50 oC (with a 2-hour holding at QT). The correlation of QT with microstructure and properties was estimated using microstructure/worn surface characterization, differential scanning calorimetry, hardness measurement, and three-body-abrasive wear testing (using Al2O3 particles).