Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy
AbstractIn 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
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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.
Nowak WJ, Ochał K, Wierzba P, Gancarczyk K, Wierzba B. Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy. Metals. 2019; 9(7):782.Chicago/Turabian Style
Nowak, Wojciech J.; Ochał, Kamil; Wierzba, Patrycja; Gancarczyk, Kamil; Wierzba, Bartek. 2019. "Effect of Substrate Roughness on Oxidation Resistance of an Aluminized Ni-Base Superalloy." Metals 9, no. 7: 782.
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