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Investigation of Porosity Changes in Cast Ti6Al4V Rods After Hot Isostatic Pressing

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Abstract

The porosities of cast Ti6Al4V rods were investigated nondestructively using x-ray microcomputed tomography (microCT) before and after HIP. This allowed the visualization and quantification of porosity changes in the same samples, which indicate excellent pore closure for large pores. This is the first reported application of x-ray microCT for direct analysis of investment casting porosity before and after HIP. The method shows promise for further investigations using delayed HIP treatments or monitoring of pore closure at further varying HIP cycle settings. The nondestructive nature of the analysis has resulted in the interesting observation of small subsurface pores (<250 μm) unaffected by hot isostatic pressing in two of the samples.

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Acknowledgments

The South African Department of Science and Technology and the CSIR have funded aspects of this work and are gratefully acknowledged.

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Authors and Affiliations

  1. CT Scanner Facility, Central Analytical Facilities, Stellenbosch University, Stellenbosch, South Africa

    Anton du Plessis

  2. Physics Department, Stellenbosch University, Stellenbosch, South Africa

    Anton du Plessis

  3. CSIR Materials Science and Manufacturing, Pretoria, South Africa

    Pierre Rossouw

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  1. Anton du Plessis
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  2. Pierre Rossouw
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Correspondence to Anton du Plessis.

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du Plessis, A., Rossouw, P. Investigation of Porosity Changes in Cast Ti6Al4V Rods After Hot Isostatic Pressing. J. of Materi Eng and Perform 24, 3137–3141 (2015). https://doi.org/10.1007/s11665-015-1580-4

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  • DOI: https://doi.org/10.1007/s11665-015-1580-4

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