TY - JOUR
T1 - Effect of heat treatments on the wear resistance of HVAF and HVOF sprayed tool steel coatings
AU - Varis, Tommi
AU - Lagerbom, Juha
AU - Suhonen, Tomi
AU - Raami, Lassi
AU - Terho, Sakari
AU - Laurila, Jussi
AU - Peura, Pasi
AU - Vuoristo, Petri
PY - 2023/6/15
Y1 - 2023/6/15
N2 - 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.
AB - 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.
KW - Three-body abrasion
KW - Cavitation erosion
KW - Steel
KW - Thermal spray coatings
KW - Wear testing
U2 - 10.1016/j.surfcoat.2023.129508
DO - 10.1016/j.surfcoat.2023.129508
M3 - Article
SN - 0257-8972
VL - 462
JO - Surface & Coatings Technology
JF - Surface & Coatings Technology
M1 - 129508
ER -