The Effectiveness of Hot Isostatic Pressing for Closing Porosity in Titanium Parts Manufactured by Selective Electron Beam Melting

By S. Tammas-Williams, P. J. Withers, Iain Todd, P. Prangnell. Metallurgical and Materials Transactions. A, 2016

250 citations recorded by the source corpus.

Ti-6Al-4V parts, produced by selective electron beam melting additive manufacturing, have been studied by X-ray computed tomography (XCT) to track pore closure during a standard hot isostatic pressing (HIPing) cycle. Comparison of repeated XCT scans before and after HIPing, on worst-case samples with different geometries, confirmed that all internal porosity was shrunk to below the resolution limit of the equipment used (~5 µm) following the HIPing cycle, apart from defects with surface connected ligaments.

Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/54afedda206252224904fea71dd6223890074469

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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, methodology): “Previous work using lab-scale μXCT with feature resolution of ∼5 μm did not detect any porosity in the HIPed condition, although cross-section analysis suggested the presence of incompletely closed pores [5,30].”
Effects of defects on mechanical properties in metal additive manufacturing: A review focusing on X-ray tomography insights (2020, background): “general [115], and for additively manufactured metals in particular [48,116].”
Micromechanical behavior and thermal stability of a dual-phase α+α’ titanium alloy produced by additive manufacturing (2019, background): “tic Pressing (HIP) to increase the relative density [6,9,10,15] and improve the fatigue properties, or stress-relief [16].”
Multiaxial fatigue behavior of wrought and additive manufactured Ti-6Al-4V including surface finish effect (2017, background): “For example, a study on the effectiveness of HIP at 920 C and 100 MPa for e-beam PBF Ti-6Al-4V parts shows that all internal defects could shrink to less than 5 lm [9].”
Advances in Metal Additive Manufacturing: A Review of Common Processes, Industrial Applications, and Current Challenges (2021, methodology): “Therefore, it is recommended to perform a heat treatment operation after the HIP to enhance the effectiveness of the HIP process [144,145].”