Analyzing the effects of powder and post-processing on porosity and properties of electron beam melted Ti-6Al-4V. Issue 7 (3rd November 2017)

• Record Type: Journal Article
• Authors: Cunningham, Ross; Nicolas, Andrea; Madsen, John; Fodran, Eric; Anagnostou, Elias; Sangid, Michael D.; Rollett, Anthony D.
• Is Part Of: Materials research letters. Volume 5:Issue 7(2017)
• Page Start: 516
• Page End: 525
• Publication Date: 2017-11-03
• Subjects: Additive manufacturing -- electron beam melting -- defects -- X-ray tomography -- crystal plasticity; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2017.1340911
• Languages: English
• ISSNs: 2166-3831

Abstract

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.