Effect of heat treatments on the wear resistance of HVAF and HVOF sprayed tool steel coatings

Tommi Varis; Juha Lagerbom; Tomi Suhonen; Lassi Raami; Sakari Terho; Jussi Laurila; Pasi Peura; Petri Vuoristo

doi:10.1016/j.surfcoat.2023.129508

Effect of heat treatments on the wear resistance of HVAF and HVOF sprayed tool steel coatings

Tommi Varis^*, Juha Lagerbom, Tomi Suhonen, Lassi Raami, Sakari Terho, Jussi Laurila, Pasi Peura, Petri Vuoristo

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

13 Citations (Scopus)

Abstract

Iron-based coatings are an attractive solution for many wear applications, considering sustainability requirements such as avoidance of critical raw materials and toxic substances. Cold worked tool steels are one potential, yet very undiscovered, material option for coating applications. As a bulk, their careful heat treatment typically produces a martensitic carbide microstructure with very good wear resistance. Compared to bulk materials, the thermal history of a thermally sprayed coating in the as sprayed state is quite different as the microstructure of the sprayed coating does not form in equilibrium. This study explored the potential of AISI D2 cold worked tool steel as a thermal spray coating under different wear conditions. The study investigated different heat treatments to achieve different microstructures of the powder and coatings and their effect on the wear and cavitation erosion properties of the HVOF and HVAF sprayed thermally sprayed tool steel coating. It is important to understand whether the properties of thermally sprayed coatings, which initially have a high defect density, can be improved by heat treatments, and how modification of the phase structures of iron-based coatings affects their properties, in order to extend the use of these coatings.

Original language	English
Article number	129508
Number of pages	14
Journal	Surface and Coatings Technology
Volume	462
DOIs	https://doi.org/10.1016/j.surfcoat.2023.129508
Publication status	Published - 23 Jun 2023
MoE publication type	A1 Journal article-refereed

Funding

The research was funded by Academy of Finland, project “Enabling phenomena behind multihierarchical strengthening of high kinetic sprayed metallic coatings” (HIERARCH, Decision NUM: 318064). Authors would like to thank Anssi Metsähonkala and Jarkko Lehti from Tampere University, Thermal Spray Center Finland (TSCF), Tampere, Finland, for spraying the coatings and Luka Valmu from Tampere University for carrying out the wear tests. The research was funded by Academy of Finland , project “Enabling phenomena behind multihierarchical strengthening of high kinetic sprayed metallic coatings” (HIERARCH, Decision NUM: 318064 ). Authors would like to thank Anssi Metsähonkala and Jarkko Lehti from Tampere University, Thermal Spray Center Finland (TSCF), Tampere, Finland, for spraying the coatings and Luka Valmu from Tampere University for carrying out the wear tests.

Keywords

Cavitation erosion
Steel
Thermal spray coatings
Three-body abrasion
Wear testing

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title = "Effect of heat treatments on the wear resistance of HVAF and HVOF sprayed tool steel coatings",

abstract = "Iron-based coatings are an attractive solution for many wear applications, considering sustainability requirements such as avoidance of critical raw materials and toxic substances. Cold worked tool steels are one potential, yet very undiscovered, material option for coating applications. As a bulk, their careful heat treatment typically produces a martensitic carbide microstructure with very good wear resistance. Compared to bulk materials, the thermal history of a thermally sprayed coating in the as sprayed state is quite different as the microstructure of the sprayed coating does not form in equilibrium. This study explored the potential of AISI D2 cold worked tool steel as a thermal spray coating under different wear conditions. The study investigated different heat treatments to achieve different microstructures of the powder and coatings and their effect on the wear and cavitation erosion properties of the HVOF and HVAF sprayed thermally sprayed tool steel coating. It is important to understand whether the properties of thermally sprayed coatings, which initially have a high defect density, can be improved by heat treatments, and how modification of the phase structures of iron-based coatings affects their properties, in order to extend the use of these coatings.",

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AU - Laurila, Jussi

AU - Peura, Pasi

AU - Vuoristo, Petri

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Effect of heat treatments on the wear resistance of HVAF and HVOF sprayed tool steel coatings

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