Influence of scan strategy on porosity and microstructure of Ti-6Al-4V fabricated by electron beam powder bed fusion

Nandwana, Peeyush; Lee, Yousub

doi:10.1016/j.mtcomm.2020.100962

Influence of scan strategy on porosity and microstructure of Ti-6Al-4V fabricated by electron beam powder bed fusion

Journal Article · Sun Jan 26 23:00:00 EST 2020 · Materials Today Communications

DOI:https://doi.org/10.1016/j.mtcomm.2020.100962· OSTI ID:1606739

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Ti-6Al-4V is of high value in biomedical, aerospace, and industrial sectors and is ideal for additive manufacturing (AM) because of its poor machinability. In electron beam powder bed fusion of Ti-6Al-4V, a raster scan is commonly used and often results in porosity that is detrimental to the fatigue strength. In this paper, we demonstrate that spot melting can significantly minimize porosity but produces a coarser microstructure compared to raster melting. Process parameters can be optimized to achieve minimal porosity with tailored microstructures. A finite element method was used to rationalize these observations.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606739

Alternate ID(s):: OSTI ID: 1809823

Journal Information:: Materials Today Communications, Journal Name: Materials Today Communications Journal Issue: C Vol. 24; ISSN 2352-4928

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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