Abstract
Influences of the cooling rate after solution treatment on microstructural evolution and mechanical properties of Rene 80 nickel-based superalloy were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy and mechanical test. Results showed that the high cooling rate decreased the size of secondary γ′ particles in the supersaturated matrix, but led to a high coarsening rate of γ′ particles during subsequent aging treatment. Despite various coarsening rates, the size and morphology of γ′ particles in the final microstructures of all samples were close due to the long enough holding time to an equilibrium state. During the aging of 870 °C/2 h, primary MC started to decompose with the carbide reaction: MC + γ → M 6C or M 23C6 + γ′. And a number of observations showed that the coarsening of γ′ particles on grain boundaries resulted in the depletion of γ′ during aging treatment. The test results indicated that high cooling rate resulted in the presence of quench crack, and the air cooling method following solution treatment was an optimum heat treatment method for Rene 80.
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.
