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Title: Post-processing of cold sprayedTi-6Al-4V coatings by mechanical peening
Authors: Maharjan, Niroj
Bhowmik, Ayan
Kum, Cunwai
Hu, Jiakun
Yang, Yongjin
Zhou, Wei
Keywords: Engineering::Mechanical engineering
Issue Date: 2021
Source: Maharjan, N., Bhowmik, A., Kum, C., Hu, J., Yang, Y. & Zhou, W. (2021). Post-processing of cold sprayedTi-6Al-4V coatings by mechanical peening. Metals, 11(7), 1038-.
Project: CRP6–C19_01_ARTC
Journal: Metals
Abstract: Cold spray is an emerging additive manufacturing technology used in the aerospace industry to repair damaged components made of expensive metal alloys. The cold sprayed layer is prone to surface integrity issues such as high porosity and inadequate bonding at the substrate-coating interface, which may cause premature failure of the repaired component. This study explored the use of mechanical peening as a post-processing method to improve the surface integrity of the cold sprayed component by modifying mechanical properties near the surface. Two mechanical peening processes, deep cold rolling (DCR) and controlled hammer peening (CHP), were utilized to improve cold sprayed Ti-6Al-4V coating on the Ti-6Al-4V substrate. Experimental results indicate that DCR and CHP increase the strength of the bond between the coating and substrate due to introduction of compressive residual stresses. In addition, porosity is also reduced by as much as 71%. The improvement is attributed to both the compacting effect of peening processes and the increment in the volume fraction of deformed regions.
ISSN: 2075-4701
DOI: 10.3390/met11071038
Rights: © 2021 The Author(s). Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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