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Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy

Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Powstancow Warszawy 12, 35-959 Rzeszow, Poland
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Metals 2019, 9(7), 782; https://doi.org/10.3390/met9070782
Received: 12 June 2019 / Revised: 30 June 2019 / Accepted: 10 July 2019 / Published: 12 July 2019
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Abstract

In the present work, it is shown that the surface preparation method used on two Ni-based superalloys prior to aluminizing chemical vapor deposition (CVD) is one of the most important factors determining the oxidation resistance of aluminized Ni-based superalloys. It was found that grit-blasting the substrate surface negatively affects the oxidation resistance of the aluminized coatings. For grit-blasted and aluminized IN 625, a thicker outer NiAl coating was formed compared to that of IN 738. In contrast, no effect on NiAl coating thickness was found for grit-blasted and aluminized IN 738. However, a thicker interdiffusion zone (IDZ) was observed. It was shown that the systems with grit-blasted surfaces reveal worse oxidation resistance during thermal shock tests—namely, a higher mass loss was observed for both grit-blasted and aluminized alloys, as compared to ground and aluminized alloys. A possible reason for this effect of remaining alumina particles originating from surface grit-blasting on the diffusion processes and stress distribution at the coating/substrate is proposed. View Full-Text
Keywords: aluminide coating; chemical vapor deposition; surface roughness; oxidation resistance; thermal shock test aluminide coating; chemical vapor deposition; surface roughness; oxidation resistance; thermal shock test
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nowak, W.J.; Ochał, K.; Wierzba, P.; Gancarczyk, K.; Wierzba, B. Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy. Metals 2019, 9, 782.

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