Surface and Tribological Properties of Powder Metallurgical Cp-Ti Titanium Alloy Modified by Shot Peening
Avcu Y.Y. Iakovakis E. Guney M. Çalım E. Özkılınç A. Abakay E. Sönmez F. Koç F.G. Yamanoğlu R. Cengiz A. Avcu E.
January 2023MDPI
Coatings
2023#13Issue 1
The present study reveals for the first time the dry sliding wear behavior of a powder metallurgical pure titanium alloy (Cp-Ti) modified by shot peening. Cp-Ti samples were manufactured via powder metallurgy, and then their surface and subsurface features were modified using a custom-made, fully automated shot-peening system. The texture isotropy rate and the highest orientation angle of the shot-peened samples were 71.5% and 36°, respectively. The Abbott curves of the shot-peened surfaces revealed that the most common areal roughness value was 5.177 μm, with a frequency of 8.1%. Shot-peened surfaces exhibited an ~20% lower wear rate than unpeened surfaces under dry sliding wear, whereas the coefficient of friction was the same for both surfaces. Micro-ploughing, micro-cutting, oxidation, and three-body abrasion wear mechanisms were observed on the shot-peened and unpeened surfaces. High resolution 3D surface topographies of worn unpeened and shot-peened surfaces revealed micro-scratches and inhomogeneities along wear tracks, which are indicative of three-body abrasion mechanisms during contact. In addition, vertical and horizontal microcracks were visible just beneath the wear track, suggesting a clear indication of plastic deformation during contact. The cross-sectional hardness maps of shot-peened samples revealed the formation of a work-hardened surface layer with shot peening, which improved the wear resistance. These findings support that shot peening can be a useful tool to modify the surface and tribological properties of powder metallurgical Cp-Ti alloys.
friction , hardness mapping , implants , shot peening , titanium alloys , topography , wear rate
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Department of Mechanical Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Department of Mechanical Aerospace and Civil Engineering, The University of Manchester, Manchester, M13 9PL, United Kingdom
Department of Civil and Environmental Engineering, Nazarbayev University, Astana, 010000, Kazakhstan
The Environment & Resource Efficiency Cluster (EREC), Nazarbayev University, Astana, 010000, Kazakhstan
Department of Metallurgy and Materials Engineering, Sakarya University, Sakarya, 54050, Turkey
Hasan Ferdi Turgutlu Faculty of Technology, Department of Mechanical Engineering, Manisa Celal Bayar University, Manisa, 45140, Turkey
Department of Metallurgy and Materials Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Department of Automotive Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Ford Otosan Ihsaniye Automotive Vocational School, Kocaeli University, Kocaeli, 41650, Turkey
Department of Mechanical Engineering
Department of Mechanical Aerospace and Civil Engineering
Department of Civil and Environmental Engineering
The Environment & Resource Efficiency Cluster (EREC)
Department of Metallurgy and Materials Engineering
Hasan Ferdi Turgutlu Faculty of Technology
Department of Metallurgy and Materials Engineering
Department of Automotive Engineering
Ford Otosan Ihsaniye Automotive Vocational School
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