The Cavitation Resistance of WC-10Co4Cr and WC-20CrC-7Ni HVAF Coatings

Thursday, May 27, 2021: 8:15 AM
Prof. Yury Korobov , M.N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation, Ural Federal University, Yekaterinburg, Russian Federation
Mr. Hussam Alwan , University of Technology, Baghdad, Iraq, Ural Federal University, Yekaterinburg, Russian Federation
Dr. Natalia Soboleva , Ural Federal University, Yekaterinburg, Russian Federation, Institute of Engineering Science, Russian Academy of Science, Yekaterinburg, Russian Federation
Prof. Aleksey Makarov , M.N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation
Mr. Nikita Lezhnin , M.N. Miheev Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russian Federation
Dr. Valentin Shymiakov , Ural Federal University, Yekaterinburg, Russian Federation
Dr. Maksim Antonov , University of Technology, Tallinn, Estonia
Mr. Michael Deviatiarov , Ural Welding Institute-Metallutgy, Ekaterinburg, Russian Federation
The Cavitation Resistance of WC-10Co4Cr and WC-20CrC-7Ni HVAF Coatings Two kinds of cermet powders, namely WC-10Co4Cr and WC-20CrC-7Ni, were deposited on an AISI 1040 steel substrate using a high velocity air fuel thermal spraying process (HVAF) to evaluate resistance in cavitation erosion conditios with additional electrochemical effects. The microstructure of the obtained HVAF coatings were observed by a scanning electron microscope (SEM), while the phase composition was analyzed using an energy-dispersive microanalysis system (EDS). The microhardness (HV0.05) of the coatings and substrate was measured. In addition, the surface topography of the eroded surface layers was observed using a 3D optical profilometer. The results revealed that the cavitation resistance of the WC-20CrC-7Ni coating was approximately 1.3 times greater than that of the WC-10Co4Cr coating. The study of the structure and surface topography allows us to identity the reasons for the differences between the two coatings: the WC-20CrC-7Ni coating has a finer grain structure, a lower pore density level, and lower initial surface roughness. These differences, along with the presence of high Cr and Ni content in the feedstock powder of this coating (responsible for strengthening the matrix and increasing its corrosion resistance), contribute to improving cavitation resistance and reducing material loss.
See more of: Wear, Corrosion and Tribology II-a
See more of: Thermal Spray Applications