Abstract
Ni-base superalloy In-718 was coated by hot-dipping into a molten bath containing Al–7wt.%Si. Cyclic oxidation experiments on bare substrate and aluminized alloy were conducted at 1100 °C, covering 240 cycles in static air. After hot dip treatment the coating layers consisted of two phases Al and FeAlSi were detected in the external topcoat to the aluminide/alloy substrate. After oxidation testing, a continuous alumina scale was detected on the surface of the aluminide layer. This coating shows better cyclic oxidation resistance for In-718 alloy than untreated substrate. Cr 2O 3 was found to be the primary oxide phase in the oxidation of bare In-718 alloy. The inward diffusion of Al in the aluminide layer was restricted by the interdiffusion zone. The NiAl phase constituent of the aluminide layer was similar through all of the testing. Only the γ phase could be found below the coating surface and in the subsurface region as aluminum was lost to form the oxide.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
