Abrasive impact wear resistance of hardfacings

摘要

To reduce wear at extreme abrasive wear conditions (high abrasivity, high velocities and elevated temperatures), materials with optimal hardness-toughness properties are preferable. In composites structures it is possible to combine high hardness of reinforcement (for example of carbides) with high toughness of a metal matrix (nickel or iron based). Recent study is devoted to the technology and properties of powder metallurgy produced composite hardfacings. As a matrix material, Fe- and Ni-based self-fluxing alloys powders and as a reinforcement recycled WC-Co hardmetal powder were used. Centrifugal type universal accelerator and abrasive impact wear tester were used for the study of the wear resistance at abrasive erosive and at abrasive impact wear. The influence of reinforcement size and abrasive particles velocity to wear of studied materials was investigated. As reference materials, steel Hardox 400 and composite wear plate CDP112 (Castolin Eutectic) were studied. The relative wear resistance was found to be dependent as on hard-facings' composition, as on wear parameters: at abrasive erosive wear the wear resistance of best hard-facings exceeded of that of reference steel Hardox 400 up to 3 times; at abrasive impact wear – up to 4 times.