Effectiveness of high-frequency ultrasonic peening treatment on the tribological characteristics of Cu-based sintered materials on steel substrate |
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| Affiliation: | 1. Center for Nano-Wear, Yonsei University, Seoul 120-749, South Korea;2. Department of Hybrid Engineering, Sun Moon University, Asan 336-708, South Korea;3. Department of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea;1. Department of Mechanical Engineering, University of Akron, Akron, OH 44325, United States;2. Department of Polymer Science, University of Akron, Akron, OH 44325, United States;3. Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, United States;4. School of Engineering, University of California – Merced, Merced, CA 95343, United States;5. Timken Engineered Surfaces Laboratories, University of Akron, Akron, OH 44325, United States;6. Qatar Environment and Energy Research Institute (QEERI), Qatar Foundation, Doha, Qatar;7. Department of Mechanical Engineering, University of Texas at Dallas, Richardson, TX 75080-3021, United States;8. Department of Geology, University of Akron, Akron, OH 44325, United States;9. Integrated Bioscience, University of Akron, Akron, OH 44325, United States;1. Department of Mechanical Engineering, Tokyo University of Science, Tokyo 125-8585, Japan;2. Department of Mechanical Engineering, Sun Moon University, Asan 336-708, South Korea |
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| Abstract: | The effects of high-frequency ultrasonic peening (HFUP) on the tribological characteristics of Cu-based materials sintered on low carbon steel by a powder metallurgy (P/M) technique were investigated. The friction and wear properties of the Cu-based materials were studied using a pin-on-disk reciprocating tribotester sliding against a hardened steel ball under dry and oil-lubricated conditions. Scanning electron microscopy (SEM) was utilized to analyze the worn surfaces and to assess the wear mechanisms. Experimental results showed that the HFUP process led to a reduction in friction and wear of the Cu-based materials in both dry and oil-lubricated conditions. This was attributed to the increase in hardness of the HFUP treated specimen. It was also found that the friction coefficient was independent of the normal load but decreased with increasing sliding speed. In addition, inclusion of Fe in the Cu-based material was helpful in reduction of friction and wear. SEM analyses showed that abrasive wear was the dominant wear mechanism of the specimens. The results of this work demonstrate the effectiveness of HFUP in improving the tribological properties of Cu-based materials. |
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