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Title: Post-processing of cold sprayed CoNiCrAlY coatings on Inconel 718 by rapid induction heating
Authors: Yang, Yongjing
Aprilia, Aprilia
Wu, Kaiqiang
Tan, Sung Chyn
Zhou, Wei
Keywords: Engineering::Mechanical engineering
Issue Date: 2022
Source: Yang, Y., Aprilia, A., Wu, K., Tan, S. C. & Zhou, W. (2022). Post-processing of cold sprayed CoNiCrAlY coatings on Inconel 718 by rapid induction heating. Metals, 12(3), 396-.
Project: #002123-00002 
Journal: Metals 
Abstract: Cold spray is a solid-state additive manufacturing process that has been increasingly used for restoration of damaged parts. Due to the nature of powder solid-state bonding, cold spray coatings usually possess pores in the microstructures. Heat treatment has been widely used as a post-processing method to reduce the porosity of cold sprayed coatings. However, it usually requires the whole component to be treated in the furnace and typically takes a few hours to finish the treatment. This study aims to develop a localized and rapid post-processing method for cold sprayed coatings. Multi-layer cold sprayed coatings of CoNiCrAlY on an Inconel 718 substrate were produced. Then the coatings were heat treated at 800◦ C, 900◦ C, 1000◦ C and 1100◦ C by rapid induction heating. The porosity level of the coatings reduced significantly after induction heating for a short period of merely 10 min. This is attributed to the preferential Joule heating at pore regions, which results in pore closures within the coatings. The potential application of induction heating as a rapid post-processing method for cold spray coatings has been demonstrated in this work.
ISSN: 2075-4701
DOI: 10.3390/met12030396
Schools: School of Mechanical and Aerospace Engineering 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Rights: © 2022 by the authors. 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 (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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