EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND PROPERTIES OF TI-22AL-25NB ALLOY FABRICATED BY SELECTIVE LASER MELTING

1 POLOZOV Igor
Co-authors:
1 SUFIIAROV Vadim 1 KANTYUKOV Artem 1 POPOVICH Anatoliy
Institution:
1 Peter the Great St, Petersburg Polytechnic University, St. Petersburg, Russian Federation polozov_ia@spbstu.ru
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1511-1516
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
36 views / 17 downloads
Abstract

Ti-22Al-25Nb orthorhombic alloy is considered to be an advanced intermetallic alloy for high-temperature applications. In this paper, the effects of Hot Isostatic Pressure (HIP), homogenizing annealing and aging in different phase regions on microstructure and microhardness of the Ti-22Al-25Nb alloy obtained from elemental powders by Selective Laser Melting (SLM) were studied. HIP allowed to reduce the residual porosity in the samples, however high-temperature annealing was needed to dissolve Nb particles and obtain a homogeneous microstructure. Differential Scanning Calorimetry was used to determine phase transition temperatures in the fabricated alloy and allowed to choose appropriate aging temperatures. Aging of the alloy resulted in the formation of intermetallic Ti2AlNb and Ti3Al phase depending on the temperature.

Keywords: Additive manufacturing, Ti-22Al-25Nb, heat treatment, microstructure, intermetallic
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