Abstract
ABSTRACT Higher build rates in Laser Powder Bed Fusion (LPBF) process in combination with Hot Isostatic Pressing (HIP) have been proposed to reduce the cost-per-part of additive manufacturing. However, inert gas trapped in the pores could cause healed pores to re-grow after elevated temperature exposure. Therefore, understanding the possible effects of this pore re-opening phenomenon is crucial in maintaining quality of parts subjected to elevated temperatures during service. The aim of the present study was to investigate pore re-opening after HIP in Ti–6Al–4V parts by exposing samples to different elevated temperatures for varying times. The changes in the pore content were studied using microscopy and micro X-ray computed tomography in combination with gas content analysis. Based on the results, it was concluded that for typical service temperatures of Ti–6Al–4V, pore re-opening was minimal.
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