期刊
WEAR
卷 364, 期 -, 页码 201-210出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2016.07.015
关键词
Ball-milling; Metal ceramic composite; HVOF; Martensitic/Ferritic steels; Cavitation erosion; Wear mechanisms
资金
- NSERC
- Hydro-Quebec through the Multisectorial Industrial Research Chair in Coatings and Surface Engineering [IRC 433808 - 11]
Cavitation erosion is a leading cause of hydraulic machinery erosion: imploding cavitation bubbles cause impacts, pitting, and mass loss leading to the component's failure. Damage can be mitigated by the use of protective coatings tailored to resist pitting and crack nucleation, to greatly increase the part's lifetime. Coatings deposited with the High Velocity Oxy-Fuel (HVOF) process demonstrate low porosity, high hardness and high adhesion. In this work, the cavitation erosion behavior of martensitic and ferritic stainless steels and HVOF coatings prepared from pure Fe3Al powder and Fe3Al reinforced with nitride and boride phases was investigated using the G32 vibratory setup. The results are compared with coatings sprayed from commercial powders: WC-CoCr and Cr3C2-NiCr. HVOF coatings exhibit slightly lower erosion rates than martensitic stainless steels. The mechanical properties were evaluated using depth sensing indentation: higher hardness was associated with better cavitation erosion resistance for steels, but not for the coatings. The composite coatings' wear mechanisms followed a matrix erosion pattern accompanied by ceramic grain removal. (C) 2016 Elsevier B.V. All rights reserved.
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