INFLUENCE OF HEAT TREATMENT ON MICROSTRUCTURE PROPERTIES OF NITI ALLOY

1 Losertová Monika
Co-authors:
1 Štencek Michal 1 Drápala Jaromír 1 Štefek Ondřej 1 Konečná Kateřina 2 Kamenský Miroslav
Institutions:
1 Vysoká škola báňská – Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering, Ostrava, Czech Republic, EU, mlosertova@vsb.cz
2 MEDIN, a.s., Vlachovická 619, 592 31 Nové Město na Moravě, Czech Republic, EU
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1866-1873
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
39 views / 17 downloads
Abstract

Thermal treatment of NiTi alloys allows influencing of superelastic behavior through microstructure changes significantly. The appropriate thermal regime is able to move austenite-martensite transformation temperatures. The aim of the work was the study of microstructure of NiTi specimens with 55.85 wt.% Ni of the wire shape before and after the thermal treatment. The heat regimes were performed at these conditions: solution treatment at 600 °C for 1 hour followed by water quenching; ageing at eight different temperatures (250, 270, 290, 300, 350, 400, 450 and 500 °C) for 30 minutes. Microstructures features were studied by means of optical and scanning electron microscopies, EDX microanalysis and microhardness measurement. Higher ageing temperatures led to an increase in microhardness and microstructure changes.

Keywords: NiTi, heat treatment, ageing, microstructure, SEM/EDX analyses

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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