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25-09-2017 | Issue 11/2017

Metallurgical and Materials Transactions A 11/2017

The Kinetics of Precipitate Dissolution in a Nickel-Base Superalloy

Journal:
Metallurgical and Materials Transactions A > Issue 11/2017
Authors:
S. L. Semiatin, N. C. Levkulich, A. E. Saurber, D. W. Mahaffey, E. J. Payton, O. N. Senkov
Important notes
Manuscript submitted June 20, 2017.

Abstract

The effect of microstructure and soft impingement on the kinetics of static dissolution of γ′ precipitates during supersolvus solution treatment of the powder-metallurgy nickel-base superalloy LSHR were determined experimentally and interpreted in the context of a simple diffusion model. The starting material had either a fine duplex structure of γ grains and γ′ precipitates (each of which were ~2 μm in diameter) or a structure comprising ~2-μm-diameter γ′ precipitates lying within large (~15 μm) γ grains. Using a direct-resistance-heated Gleeble® machine, the temperature of each sample was first equilibrated at a fixed subsolvus temperature (at which the microstructure was also stabilized) and then quickly raised to and held for a predetermined time in the single-phase γ field. The dissolution of γ′ was found to be approximately five times as fast for the duplex structure in comparison to the kinetics for the intragranular precipitates. The results were interpreted using numerical simulations of dissolution based on the Whelan model modified to account for a distribution of precipitates (rather than a single, isolated spherical particle) and soft impingement of diffusion fields. Using independently-measured values for diffusivity, precipitate composition, and phase equilibria as input, simulation predictions showed good agreement with the observations in terms of the temporal variation of volume fraction and average particle radius. By this means, insight into the retarding influence of soft impingement and the accelerating effect of pipe diffusion (due to stored dislocations) on the rate of dissolution was obtained

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