Effect of the substrate surface and coating powder hardness on the formation of a cold sprayed composite layer

Ayça Demirer Kahraman; Fatih Kahraman; Osman Çulha; Tuğçe Yağcı

doi:10.1515/mt-2022-0214

Article

Effect of the substrate surface and coating powder hardness on the formation of a cold sprayed composite layer

Ayça Demirer Kahraman , Fatih Kahraman , Osman Çulha and Tuğçe Yağcı

Published/Copyright: January 9, 2023

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From the journal Materials Testing Volume 65 Issue 1

Abstract

In this study, the powder hardness and substrate surface hardness on the coating formation in the cold spray process was investigated. The AA6082 aluminum alloy hardened by the shot-peening process was used as the base material. Two different metallic powders and a ceramic particle powder were used as powder materials with different hardness. Thus, the powder particles from different materials were sprayed onto the surface under the same spraying process conditions. In order to obtain a workpiece surface with different hardness values, shot-peening treatment was applied to the substrate material at different treatment times. According to the microstructural examination, the harder metallic coating powder has accumulated more and the lower hardness metallic coating powder has accumulated less when the substrate material hardness increases. Al₂O₃ particles in the layer formed were distributed close to homogeneous. Furthermore, the size of Al₂O₃ particles near the contact surface has become much finer especially in the long-term shot peened samples due to their higher hardness. From the indentation experiments, the elastic behavior and recovery amount of the composite coating layer increased due to the increase of the substrate surface hardness, and the stress distributions were performed less after the load was removed.

Keywords: cold spray (CS); composite layer formation; powder hardness; shot peening; substrate surface hardness

Corresponding author: Fatih Kahraman, Mechanical Engineering, Dokuz Eylül Üniversitesi Mühendislik Fakültesi, Tinaztepe Yerleskesi Buca-Izmir, 35390 Buca, İzmir, Türkiye, E-mail: fatih.kahraman@deu.edu.tr

Author contributions: All the authors have accepted respon-sibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Published Online: 2023-01-09

Published in Print: 2023-01-27

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Articles in the same Issue

https://doi.org/10.1515/mt-2022-0214

Keywords for this article

cold spray (CS); composite layer formation; powder hardness; shot peening; substrate surface hardness