2018 年 104 巻 12 号 p. 750-757
In this study, multi-component white cast irons containing various the amount and combination of MC, M2C and M7C3 carbides were heat treated by hardening and tempering, and their abrasive wear behavior was investigated using Suga type abrasion wear tester.
The wear rate (Rw) decreased greatly with an increase in macro-hardness and slightly with volume fraction of retained austenite (Vγ) regardless of the kinds of carbide or heat treatment conditions. In order to clarify the effect of carbide types on the abrasive wear resistance, the subzero treatment was conducted to get the specimens with very low Vγ and adjusted to almost the same hardness. It was found that in spite of a decrease in total amount of carbides, the specimen containing only MC carbide showed almost same Rw as the basic alloy specimen in which MC and M2C carbides coexisted. On the other hand, Rw increased as the M2C carbide amount increased from that of basic alloy specimen.
