| High chromium white cast irons are commonly used where abrasion resistance is needed. Several investigators have reported the low stress abrasion resistance of white cast irons containing a various amount of carbide using rubber wheel abrasion tester(RWAT) with SiO₂and Al₂O₃ abrasives. In this study the role of MC type carbides with high hardness as well as M_7C₃type carbides in improving abrasive wear resistance was investigated. The weight percent of V was fixed as 5wt.%. However, the volume fraction of MC type carbide was decreased with increasing the volume fraction of primary (Cr, Fe, V)_7C₃type carbides due to the increase of higher Cr and C alloying content in hyper high chromium white cast irons. As a result, the specimen with many primary M_7C₃ type carbides and the lowest volume fraction of MC type carbide had the best abrasion wear resistance against SiO₂abrasive, but it was not effective for abrasive wear resistance against Al₂O₃ abrasives. |
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