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Graham, Simon
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A Microstructural Assessment of the Thermal Gradient during Large-scale FAST/SPS Sintering for Tall Samples and Multi-Sample Serial Stacking of Ti-6Al-4V Plates
Abstract
Field Assisted Sintering Technology (FAST) is a powder consolidation technique which is growing in popularity due its short, single-step processing cycles. However, as the process matures, more focus is being placed on the production of larger cylindrical samples (both axially and radially). For the process to be economical in production, there is also a drive towards multi-part processing via serial stacking/parallel processing. In both cases, there is the potential for substantial thermal gradients within the sample/stack which could negatively impact part properties. In this work the effect of the thermal gradient (axial and radial), in a stack of eight 120 mm diameter Ti-6Al-4V plates processed in series, has been studied experimentally via microstructural assessment and Vickers hardness measurements. Results were compared with the thermal profile simulated using COMSOL multi-physics modelling software. The successful production of a tall 85 mm height x 120 mm diameter sample is also demonstrated.