Porosity regrowth during heat treatment of hot isostatically pressed additively manufactured titanium components

• DOI: 10.1016/j.scriptamat.2016.05.002
• Publication Date: 2016-05-24T14:07:09Z
• Authors: S. Tammas-Williams; P.J. Withers; I. Todd; P.B. Prangnell
• Keywords: Hot isostatic pressing; Titanium alloy

X-ray computed tomography has been used to track the behaviour of individual pores found in selective electron beam melted additive manufactured titanium. Porosity was shrink below detection limit microtomography (< 5 μm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal pressure following pressing, progressively reappear and grow proportion their original as-built size during temperature (β-anneal) treatments, whereas larger irregular low did not reappear. The implications these observations terms manufacturing are discussed.