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01-11-2014 | Issue 11/2014

Journal of Materials Engineering and Performance 11/2014

Analysis of Grain Boundary Character in a Fine-Grained Nickel-Based Superalloy 718

Journal:
Journal of Materials Engineering and Performance > Issue 11/2014
Authors:
L. S. Araujo, D. S. dos Santos, S. Godet, J. Dille, A. L. Pinto, L. H. de Almeida

Abstract

In the current work, sheets of superalloy 718 were processed via thermomechanical route by hot and cold rolling, followed by annealing below the δ phase solvus temperature and precipitation hardening to optimum strength. Grain boundary character distribution throughout the processing was mapped via EBSD and its evolution discussed. The results show that it is possible to process the alloy to a fine grain size obtaining concomitantly a considerably high proportion of special boundaries Σ3, Σ9, and Σ27. The precipitation of δ phase presented a strong grain refining role, without significantly impairing the twinning mechanism and, consequently, the Σ3, Σ9, and Σ27 boundary formations.

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