Microstructure and mechanical properties of tial-based alloy produced by selective laser melting

Igor Polozov, Artem Kantyukov, Vera Popovich, Jia Ning Zhu, Anatoly Popovich

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Additive Manufacturing (AM) is an attractive way of producing parts of intermetallic titanium alloys. However, high brittleness of these alloys makes it challenging to produce crack-free intermetallic parts by AM. One way to overcome this problem is to use high-temperature powder-bed preheating. In this paper, Ti-48Al-2Cr-2Nb alloy was obtained by selective laser melting process with high-temperature preheating of 800-900 ºC. Crack-free specimens with a relative density of 99.9% were fabricated using an optimized process parameter set. Microstructure and phase composition were studied using scanning electron microscopy and X-Ray diffraction to reveal a fine microstructure consisting of lamellar a2/? colonies, equiaxed ? grains, and retained ß phase. Compressive tests and microhardness measurements showed that the produced alloy exhibited superior properties compared to the conventionally obtained TiAl-alloy.

Original languageEnglish
Title of host publicationProceedings of the 29th International Conference on Metallurgy and Materials (METAL 2020)
PublisherTANGER Ltd.
Pages1037-1041
ISBN (Electronic)978-80-87294-97-0
DOIs
Publication statusPublished - 2020
Event29th International Conference on Metallurgy and Materials, METAL 2020 - Brno, Czech Republic
Duration: 20 May 202022 May 2020

Conference

Conference29th International Conference on Metallurgy and Materials, METAL 2020
CountryCzech Republic
CityBrno
Period20/05/2022/05/20

Keywords

  • Additive manufacturing
  • Intermetallics
  • Selective laser melting
  • Titanium aluminide

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