What is it about?
Results from this study have been proved that initial relative density distribution has influence on the final shape of a HIP-ed capsule. Moreover, the influence of temperature gradient and capsule thickness has been shown via simulation studies and has been estimated by experimental work.
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Why is it important?
Simulation and experimental results have proven that not only an inhomogeneous relative density distribution but also a temperature gradient, between outer and interior or around capsule surface, contributes to non-uniform shrinkage or high distortion of the components after HIP. Their influences can be even more pronounced in larger and more complex shaped components.
Perspectives
Near-net-shape parts with small geometrical allowances require a reproducible, stable powder grain size distribution and good mixing before filling. Tapping and vibrating should be optimized in order to obtain maximum average relative density and minimize the inhomogeneous powder distribution. As seen from the simulation results, an exact knowledge of the initial powder distribution and temperature field in the HIP vessel needs to be taken into account in the FEM models to predict the final shape and dimension of a component precisely.
Master Chung Nguyen Van
IWM, RWTH Aachen University
Read the Original
This page is a summary of: Anisotropic shrinkage during hip of encapsulated powder, Journal of Materials Processing Technology, December 2015, Elsevier,
DOI: 10.1016/j.jmatprotec.2015.06.037.
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