Effect of Delta Phase on the Hot Deformation Behaviour and Microstructural Evolution of Inconel 718

Himanshu M. Lalvani; Martin A. Rist; Jeffery W. Brooks

doi:10.4028/www.scientific.net/AMR.89-91.313

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 89-91Effect of Delta Phase on the Hot Deformation...

Effect of Delta Phase on the Hot Deformation Behaviour and Microstructural Evolution of Inconel 718

Abstract:

In order to investigate the influence of -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  precipates at grain boundaries and along intragranular slip planes, and ii) material solution-treated to dissolve the  phase. Results indicate that the presence of  leads to a slight increase in peak stress and a proportionately greater post-peak reduction in flow stress, as compared to solution-treated material. For both types of microstructure flow softening is associated with grain refinement, but in different ways: in -free material conventional dynamic recrystallisation leads to the formation of new grains, whereas the presence of plate-like  appears to cause the mechanical break-up and segmentation of prior grains.