Dry sliding wear behaviour of additive manufactured CrC-rich WC-Co cemented carbides

Eleftherios Iakovakis, Egemen Avcu, Matthew Roy, Mark Gee, Allan Matthews

Research output: Contribution to journalArticlepeer-review


Recent progress in additive manufacturing (AM) enables the development of novel cemented carbides 16 for specifically wear-related applications. However, the available literature on their tribological 17 performance is very limited. The present work aims to reveal the friction and wear performance of 18 AM-produced cemented carbides consisting of a cobalt (Co) matrix and ~65 vol. % of tungsten (W) 19 and chromium (Cr) -rich carbides through dry reciprocating wear tests under different conditions 20 (counterbodies: alumina and hardened AISI 52100 steel balls; loads 10N and 30N), in-situ scratch 21 wear testing, post-test microscopy, and laser profilometry. The dominant wear mechanism was 22 abrasion against alumina and adhesion against steel through the removal of the Co matrix, along with 23 surface oxidation and tribolayer formation. The coefficient of friction increased by 11.9% with 24 increasing load against steel, whereas it remained the same against alumina, indicating a bearing 25 effect due to the oxidation of the wear track. The specific wear rate increased by 7.3% against alumina 26 with increasing load, while it sharply decreased by 56.4% against steel, presumably due to surface 27 strain-hardening. The in-situ scratch wear testing under a scanning electron microscope revealed 28 degradation of the Co matrix and carbides network over time. These observations provided evidence 29 of tribolayer formation and strain-hardening of the Co matrix. The present paper contributes to 30 understanding the tribological behaviour of AM-produced CrC-rich WC-Co cemented carbides, 31 which are promising for innovative and longer-lasting mining and machine tools.
Original languageEnglish
Publication statusAccepted/In press - 22 Sept 2021


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