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

Conference paper (2020)

Authors

Igor Polozov St. Petersburg Polytechnic University
Artem Kantyukov St. Petersburg Polytechnic University
V. Popovich (OLD) MSE-5
Jia Ning Zhu St. Petersburg Polytechnic University
Anatoliy Popovich St. Petersburg Polytechnic University
Research Group
(OLD) MSE-5
Copyright: © 2020 Igor Polozov, Artem Kantyukov, V. Popovich, Jia Ning Zhu, Anatoly Popovich
DOI: https://doi.org/10.37904/metal.2020.3604
More Info
expand_more

Published Date

2020

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Research Group

(OLD) MSE-5

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.

Files

Metal2020_polozov_metal.pdf
(pdf | 0.545 Mb)
Unknown license