Porosity Regrowth During Heat Treatment of Hot Isostatically Pressed Additively Manufactured Titanium Components
By S. Tammas-Williams, P. J. Withers, Iain Todd, P. Prangnell. 2016
271 citations recorded by the source corpus.
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 found to shrink below the detection limit of X-ray microtomography (< 5 μm) upon hot isostatic pressing. Spherical argon containing gas pores, which have a high internal gas pressure following hot isostatic pressing, have been found to progressively reappear and grow in proportion to their original as-built size during high temperature (β-anneal) treatments, whereas larger irregular low pressure pores did not reappear. The implications of these observations in terms of additive manufacturing are discussed.
Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/af4b23f26bf37bc03e758bb7f5453988a878d4ef
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Citations in the corpus
- Analyzing the effects of powder and post-processing on porosity and properties of electron beam melted Ti-6Al-4V (2017, background): “has shown that both gas porosity and lack of fusion porosity are eliminated within the resolution limit of lab-scale μXCT (∼5 μm) [5,27].”
- Effects of defects on mechanical properties in metal additive manufacturing: A review focusing on X-ray tomography insights (2020, background): “In study [49] it was found that in HIPped electron beammelted titanium parts, pores re-appeared after high temperature annealing (post-HIP) due to the low diffusivity of argon in titanium.”