Analyzing the effects of powder and post-processing on porosity and properties of electron beam melted Ti-6Al-4V

By Ross W Cunningham, Andrea Nicolas, J. Madsen, E. Fodran, E. Anagnostou, Michael D. Sangid, Anthony D. Rollett. 2017

229 citations recorded by the source corpus.

ABSTRACT Metal additive manufacturing techniques such as the powder-bed systems are developing as a novel method for producing complex components. This study uses synchrotron-based X-ray microtomography to investigate porosity in electron beam melted Ti-6Al-4V in the as-built and post-processed state for two different powders. The presence of gas porosity in the starting powder was shown to correlate to porosity in the as-built components. This porosity was observed to shrink after a hot isostatic press treatment, but grow following a subsequent heat treatment. Crystal plasticity simulations were used to observe the effects of various observed pore sizes on mechanical behavior under loading. GRAPHICAL ABSTRACT IMPACT STATEMENT This work combined µSXCT and crystal plasticity simulations to characterize porosity through each processing stage of EBM Ti-6Al-4V. Gas porosity was detected in the as-HIPed state, and growth was observed after subsequent heat treatment.

Subfields: Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/e667bdb720558dfe09d33ddfcaf76863eb6730c2

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In Materials Chemistry

1. Ian Ashcroft
2. M. Simonelli
3. Christopher John Tuck

In Mechanical Engineering

1. Ian Ashcroft
2. Christopher John Tuck
3. L. Parry
4. N. Aboulkhair
5. Richard J. M. Hague
6. M. Simonelli
7. I. Maskery
8. Ricky Wildman

Citations in the corpus

• X-Ray Microcomputed Tomography in Additive Manufacturing: A Review of the Current Technology and Applications (2018, unknown): “Gas entrapped in the melt pool originating from the feedstock powder was identified inrecent studies, such as in Cunningham et al. 45 where the presence of porosity in the powder was correlated with porosity in the built EB-PBF parts.”
• 3D printing of Aluminium alloys: Additive Manufacturing of Aluminium alloys using selective laser melting (2019, result): “[271] observed that pores that were closed during a HIP treatment not only reopened again once the material was heat-treated but they actually became larger compared to their original sizes before HIP.”