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Influence of processing conditions on the microstructure and sliding wear of a promising Fe-based coating deposited by HVAF
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2475-9284
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
Höganäs AB, Höganäs, (SWE).
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2021 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 409, p. 1-17, article id 126953Article in journal (Refereed) Published
Abstract [en]

Thermal spray is a versatile and cost-effective process to deposit wear and corrosion resistant coatings. In this work, a relatively new ‘Fe-based’ chemistry comprising boride and carbides, is explored as a ‘greener’ alternative to the relatively expensive and carcinogenic Co-based coatings to mitigate wear. The emergent thermal spray process of high-velocity air-fuel (HVAF) spraying was chosen to deposit the Fe-based coatings, with the high-velocity oxy-fuel (HVOF) also being employed solely for the purpose of preliminary comparison. Detailed characterization of the HVOF and HVAF sprayed Fe-based coatings was carried out. Microstructure, porosity, hardness and phase analysis results demonstrate the influence of processing conditions, where specific spray conditions yielded minimal undeformed particulates content, high hardness, low porosity and feedstock phase retention. Differences in microstructural features of the as-deposited coatings in relation to their processing conditions are discussed in detail. The coatings were subjected to ball-on-disc tribometry tests at different load conditions and their friction and wear performance were evaluated. The coefficient of friction results of investigated coatings concurred with their respective microstructural features. Post-mortem of the worn coating surface, the mating alumina ball surface and wear debris was performed using SEM/EDS analysis to understand the associated wear mechanisms and material transfer. This work provides new insights on identifying appropriate HVAF processing conditions to achieve acceptable microstructural features and phases in Fe-based coatings for improved wear performance.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 409, p. 1-17, article id 126953
Keywords [en]
Ball-on-disc test; Friction, wear, FeSP586; High velocity air fuel (HVAF); High velocity oxy fuel (HVOF)
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-17243DOI: 10.1016/j.surfcoat.2021.126953ISI: 000654045600079Scopus ID: 2-s2.0-85100486733OAI: oai:DiVA.org:hv-17243DiVA, id: diva2:1610505
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Swedish Energy Agency, P46393-1Available from: 2021-11-11 Created: 2021-11-11 Last updated: 2022-04-01

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Mahade, SatyapalAranke, OmkarBjörklund, StefanJoshi, Shrikant V.

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