|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||An Overview of the Modeling of Precipitation and Dissolution in Gamma-gamma Prime Nickel-base Superalloys
||Lee Semiatin, David Mahaffey, Eric Payton, Jay Tiley, Oleg Senkov, Nathan Levkulich
|On-Site Speaker (Planned)
An overview of the precipitation and dissolution of gamma prime in powder-metallurgy (PM), nickel-base superalloys will be presented. Attention will focus on three specific problems: (1) the nucleation and growth of secondary and tertiary gamma prime during continuous cooling following supersolvus vs subsolvus solution treatment, (2) subsolvus coarsening of gamma prime, and (3) the dissolution of gamma prime during short-time supersolvus heat treatment. For each problem, fast-acting (spreadsheet) simulation predictions will be compared to corresponding experimental observations for the PM alloy LSHR. The importance of input data (such as alloying-element partitioning, effective diffusivity, free energy of transformation, and interface energy) on model results will be highlighted. Important factors typically overlooked in simulations, e.g., the effect of concurrent deformation or stored work (from prior hot working operations) on kinetics and the effect of the latent heat of transformation on detailed (local) cooling paths, will also be discussed.
||Planned: Supplemental Proceedings volume