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 language | English |
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Title of host publication | Proceedings of the 29th International Conference on Metallurgy and Materials (METAL 2020) |
Publisher | TANGER Ltd. |
Pages | 1037-1041 |
ISBN (Electronic) | 978-80-87294-97-0 |
DOIs | |
Publication status | Published - 2020 |
Event | 29th International Conference on Metallurgy and Materials, METAL 2020 - Brno, Czech Republic Duration: 20 May 2020 → 22 May 2020 |
Conference
Conference | 29th International Conference on Metallurgy and Materials, METAL 2020 |
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Country/Territory | Czech Republic |
City | Brno |
Period | 20/05/20 → 22/05/20 |
Keywords
- Additive manufacturing
- Intermetallics
- Selective laser melting
- Titanium aluminide