Modification of surface and subsurface properties of aa1050 alloy by shot peening
Avcu Y.Y. Gönül B. Yetik O. Sönmez F. Cengiz A. Guney M. Avcu E.
November-1 2021MDPI
Materials
2021#14Issue 21
AA1050 Al alloy samples were shot-peened using stainless-steel shots at shot peening (SP) pressures of 0.1 and 0.5 MPa and surface cover rates of 100% and 1000% using a custom-designed SP system. The hardness of shot-peened samples was around twice that of unpeened samples. Hardness increased with peening pressure, whereas the higher cover rate did not lead to hardness improvement. Micro-crack formation and embedment of shots occurred by SP, while average surface roughness increased up to 9 µm at the higher peening pressure and cover rate, indicating surface deterioration. The areal coverage of the embedded shots ranged from 1% to 5% depending on the peening parameters, and the number and the mean size of the embedded shots increased at the higher SP pressure and cover rate. As evidenced and discussed through the surface and cross-sectional SEM images, the main deformation mechanisms during SP were schematically described as crater formation, folding, micro-crack formation, and material removal. Overall, shot-peened samples demonstrated improved mechanical properties, whereas sample surface integrity only deteriorated notably during SP at the higher pressure, suggesting that selecting optimal peening parameters is key to the safe use of SP. The implemented methodology can be used to modify similar soft alloys within confined compromises in surface features.
Crack growth , Mechanical behaviour , Plastic deformation , Shot peening , Soft metals
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Department of Mechanical Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Department of Mechanical Engineering, Hasan Ferdi Turgutlu Faculty of Technology, Manisa Celal Bayar University, Manisa, 45140, Turkey
Department of Automotive Engineering, Kocaeli University, Kocaeli, 41001, Turkey
Department of Civil and Environmental Engineering, The Environment and Resource Efficiency Cluster (EREC), Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
Ford Otosan Ihsaniye Automotive Vocational School, Kocaeli University, Kocaeli, 41650, Turkey
School of Materials, The University of Manchester, Manchester, M13 9PL, United Kingdom
Department of Mechanical Engineering
Department of Mechanical Engineering
Department of Automotive Engineering
Department of Civil and Environmental Engineering
Ford Otosan Ihsaniye Automotive Vocational School
School of Materials
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