2012 Volume 53 Issue 7 Pages 1258-1266
Hypoeutectic 26 mass% Cr cast irons with 0–3 mass% Mo were prepared in order to investigate their abrasive wear behavior. The annealed test pieces were hardened from 1323 K and then tempered at three levels of temperatures between 673 and 823 K for 7.2 ks, the temperature giving the maximum hardness (HTmax), lower temperature than that at HTmax (L-HTmax) and higher temperature than that at HTmax (H-HTmax). The abrasive wear resistance was evaluated using Suga wear test (two-body-type) and Rubber wheel wear test (three-body-type). It was found that hardness and Vγ in the heat-treated specimens varied depending on the Cr and Mo contents. A linear relation was obtained between wear loss and wear distance. The lowest wear rate (RW) was obtained in both the as-hardened and HTmax specimens. The highest RW was mostly obtained in the H-HTmax specimens. Under the same heat treatment condition, the RW in Suga wear test was much greater than that in Rubber wheel wear test. The RW decreased with increasing hardness. The lowest RW obtained in the specimen with a certain amount of retained austenite, 10–15%Vγ. The RW decreased with increasing Mo content in Suga abrasive test and it decreased little by Mo addition in Rubber wheel wear test.