Cracking analysis of HVOF coatings under Vickers indentation |
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| Authors: | A P Buang R Liu X J Wu M X Yao |
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| Affiliation: | (1) Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, Canada, K1S 5B6;(2) Institute for Aerospace Research, National Research Council Canada, 1200 Montreal Road, Ottawa, ON, Canada, K1A 0R6;(3) Deloro Stellite Inc., Belleville, ON, Canada, K8N 5C4 |
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| Abstract: | The fracture strength of five HVOF coatings, which are made of hard metals, Tribaloy alloy, and superalloys, respectively,
coated on 1018 low carbon steel substrate, is studied under Vickers indentation, associated with FEA stress computation. The
cross sections of the coating specimens are examined on a Hitachi Model S-570 scanning electron microscope (SEM), which investigates
the quality and measures the geometry of the coatings. The mechanical properties of the coatings and the substrate are determined
in the cross sections using the nano-indentation technique. The cracking behavior of the coatings under different indentation
loads is investigated using a Vickers hardness tester. Three-dimensional finite element analysis (FEA) simulation of the Vickers
indentation test is conducted to determine the stress fields in the coating/substrate systems in order to understand the fracture
mechanisms of the coatings under the indentation loads using the ABAQUS software package. The FEA stress results are in good
agreement with the experimental observation of Vickers indentation. |
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| Keywords: | HVOF coating Vickers indentation Crack Fracture FEA Stress |
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