Effect of delta phase on the hot deformation behaviour and microstructural evolution of inconel 718

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Lalvani, Himanshu M. and Rist, Martin A. and Brooks, Jeffery W. (2010) Effect of delta phase on the hot deformation behaviour and microstructural evolution of inconel 718. Advanced Materials Research, 89-91 (THERME). pp. 89-91. ISSN 1022-6680 (https://doi.org/10.4028/www.scientific.net/AMR.89-...)

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Abstract

In order to investigate the influence of δ-phase precipitation during high temperature forging of Inconel 718, hot axi-symmetric compression tests have been performed on specimens with two distinct initial microstructures: i) as-received material containing a dense population of δ precipates at grain boundaries and along intragranular slip planes, and ii) material solution-treated to dissolve the δ phase. Results indicate that the presence of δ leads to a slight increase in peak stress and a proportionately greater post-peak reduction in flow stress, as compared to solutiontreated material. For both types of microstructure flow softening is associated with grain refinement, but in different ways: in δ-free material conventional dynamic recrystallisation leads to the formation of new grains, whereas the presence of plate-like δ appears to cause the mechanical break-up and segmentation of prior grains.

ORCID iDs

Lalvani, Himanshu M. ORCID logoORCID: https://orcid.org/0000-0002-3466-8979, Rist, Martin A. and Brooks, Jeffery W.;
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