Papers by Author: Jeffery W. Brooks

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Authors: Himanshu M. Lalvani, Martin A. Rist, Jeffery W. Brooks
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.
Authors: Jeffery W. Brooks, S. Tin, R.P. Guest
Abstract: Forged parts, specifically designed for the validation of microstructural models, have been manufactured in Inconel alloy 718 using a wide range of thermo-mechanical histories. The microstructural evolution observed in the forged samples has been compared with predictions from two models for dynamic recrystallisation and grain growth.
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