Abstract
The goal of an aging heat treatment in Ni-based superalloys is to control the volume fraction and size of the strengthening precipitates. We predict the precipitate size evolution of primary L12 and D022 precipitates in the industrially relevant alloys CMSX-4, Rene80, and IN718 using a one-dimensional phase-field model with an artificial Gibbs–Thomson driving force considering the shape of non-spherical precipitates. In comparison with the classical theory of precipitate ripening, the presented phase-field model considers all alloying elements, non-isothermal cooling, and heating stages and off-equilibrium volume fraction. We implicitly consider elastic effects between precipitate and fcc solid solution matrix by adjusting the mobility parameters and considering size dependent non-spherical D022 precipitate shapes. Literature data reveals the strong predictive potential of this multi-scale method for integrated computational materials engineering. We identify individual aging stages during which precipitate growth is dominated by either ripening or precipitation from the supersaturated matrix phase.
Sign-in/Register to access full text options 
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.
