High temperature abrasive wear of metallic materials

Abstract

Abrasive wear at high temperatures (HT) is a serious issue that limits the lifetime of many industrial components, e.g. in steel production, the cement or the chemical industry. Various forms of abrasion like three-body abrasion, gouging, impact-abrasion or solid particle erosion degrade surfaces.In order to study abrasive wear behaviour, three different abrasion modes were investigated experimentally up to 700°C using prospective HT alloys. The wear modes were high-stress three-body abrasion, impact-abrasion and solid particle erosion to investigate the material response to these very different forms of abrasion and to further identify the critical temperatures for the materials. Various temperature- and wear-resistant metallic alloys were compared: materials with low hard phase content (~15%) and Fe-, Ni- and Co-based matrix against a high-alloyed Fe-based hardfacing with a hard phase content >50%.It was found that the in-situ formation of mechanically mixed layers (MML) with the abrasive provides excellent HT wear protection in many abrasion modes. Hence the mechanisms of MML formation were studied in greater detail, in order to predict the effectiveness of this MML formation in abrasive applications.