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Additive manufacturing of Ti-48Al-2Cr-2Nb alloy using gas atomized and mechanically alloyed plasma spheroidized powders

Journal Article (2020)
Author(s)

Igor Polozov (Peter the Great Saint-Petersburg Polytechnic University)

Artem Kantyukov (Peter the Great Saint-Petersburg Polytechnic University)

Ivan Goncharov (Peter the Great Saint-Petersburg Polytechnic University)

Nikolay Razumov (Peter the Great Saint-Petersburg Polytechnic University)

Alexey Silin (Peter the Great Saint-Petersburg Polytechnic University)

V Popovich (TU Delft - (OLD) MSE-5)

Jia Ning Zhu (TU Delft - (OLD) MSE-5)

Anatoly Popovich (Peter the Great Saint-Petersburg Polytechnic University)

Research Group
(OLD) MSE-5
Copyright
© 2020 Igor Polozov, Artem Kantyukov, Ivan Goncharov, Nikolay Razumov, Alexey Silin, V. Popovich, Jia-Ning Zhu, Anatoly Popovich
DOI related publication
https://doi.org/10.3390/ma13183952
More Info
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Publication Year
2020
Language
English
Copyright
© 2020 Igor Polozov, Artem Kantyukov, Ivan Goncharov, Nikolay Razumov, Alexey Silin, V. Popovich, Jia-Ning Zhu, Anatoly Popovich
Research Group
(OLD) MSE-5
Issue number
18
Volume number
13
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Abstract

In this paper, laser powder-bed fusion (L-PBF) additive manufacturing (AM) with a high-temperature inductive platform preheating was used to fabricate intermetallic TiAl-alloy samples. The gas atomized (GA) and mechanically alloyed plasma spheroidized (MAPS) powders of the Ti-48Al-2Cr-2Nb (at. %) alloy were used as the feedstock material. The effects of L-PBF process parameters-platform preheating temperature-on the relative density, microstructure, phase composition, andmechanicalproperties ofprintedmaterialwere evaluated. Crack-free intermetallic samples with a high relative density of 99.9% were fabricated using 900 °C preheating temperature. Scanning electron microscopy and X-Ray diffraction analyses revealed a very fine microstructure consisting of lamellar α2/γ colonies, equiaxed γ grains, and retained β phase. Compressive tests showed superior properties of AM material as compared to the conventional TiAl-alloy. However, increased oxygen content was detected inMAPS powder compared to GA powder (~1.1 wt. % and ~0.1 wt. %, respectively), which resulted in lower compressive strength and strain, but higher microhardness compared to the samples produced from GA powder.