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Open AccessArticle

Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511

1
Materials and Process Development, Swerim AB, Isafjordsgatan 28A, 16440 Stockholm, Sweden
2
Photons for Engineering and Manufacturing Group, Swiss Light Source, Paul Scherrer Institute-PSI, 5232 Villigen, Switzerland
3
Centre for Advanced Manufacturing Technologies/Fraunhofer Project Center, Wrocław University of Science and Technology, ul. Łukasiewicza 5, 50-371 Wrocław, Poland
4
Swiss Light Source, Paul Scherrer Institute-PSI, 5232 Villigen, Switzerland
5
Neutrons and X-rays for Mechanics of Materials, IMX, Ecole Polytechnique Federale de Lausanne, CH-1012 Lausanne, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1723; https://doi.org/10.3390/ma13071723
Received: 16 March 2020 / Revised: 3 April 2020 / Accepted: 3 April 2020 / Published: 7 April 2020
(This article belongs to the Special Issue Progress in Metal Additive Manufacturing and Metallurgy)
The effect of electron-beam melting (EBM) and selective laser melting (SLM) processes on the chemical composition, phase composition, density, microstructure, and microhardness of as-built Ti55511 blocks were evaluated and compared. The work also aimed to understand how each process setting affects the powder characteristics after processing. Experiments have shown that both methods can process Ti55511 successfully and can build parts with almost full density (>99%) without any internal cracks or delamination. It was observed that the SLM build sample can retain the phase composition of the initial powder, while EBM displayed significant phase changes. After the EBM process, a considerable amount of α Ti-phase and lamella-like microstructures were found in the EBM build sample and corresponding powder left in the build chamber. Both processes showed a similar effect on the variation of powder morphology after the process. Despite the apparent difference in alloying composition, the EBM build Ti55511 sample showed similar microhardness as EBM build Ti-6Al-4V. Measured microhardness of the EBM build sample is approximately 10% higher than the SLM build, and it measured as 348 ± 30.20 HV. View Full-Text
Keywords: titanium alloy; Ti55511; synchrotron; XRD; microscopy; SLM; EBM; EBSD; additive manufacturing; Rietveld analysis titanium alloy; Ti55511; synchrotron; XRD; microscopy; SLM; EBM; EBSD; additive manufacturing; Rietveld analysis
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MDPI and ACS Style

Maimaitiyili, T.; Mosur, K.; Kurzynowski, T.; Casati, N.; Van Swygenhoven, H. Phase Studies of Additively Manufactured Near Beta Titanium Alloy-Ti55511. Materials 2020, 13, 1723.

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