Two body type abrasion wear behaviour in hypoeutectic 16%Cr cast irons with Mo

Abstract

Hypoeutectic 16%Cr cast irons, both Mo free and 1–3%Mo containing specimens were prepared to investigate their abrasion wear behaviour. Annealed specimens were hardened at 1323 K and then tempered at three temperatures from 673 to 873 K for 7·2 ks, the temperature giving the maximum hardness (HTmax) and the lower and higher temperature, (L-HTmax, H-HTmax). The abrasion wear behaviour was investigated using a two body type Suga abrasion wear tester. A linear relation was obtained between wear loss and wear distance. The highest wear resistance or the lowest wear rate (RW) was obtained in HTmax specimens except for the Mo free specimen. The lowest wear resistance or the highest RW was obtained in H-HTmax specimens. The RW was decreased with an increase in macrohardness. The lowest RW appeared around 25% retained austenite (Vγ). The RW was decreased with an increase of Mo content, and the Vγ value at the minimum RW shifted to the high Vγ side.