FINITE ELEMENT MODELING OF STRESS-INDUCED Β→Ω TRANSFORMATION IN Β TITANIUM

1 KOZLÍK Jiří
Co-authors:
1 FARKAS Gergely 1 KNAPEK Michal 2 SEDLÁK Petr 1 ŠMILAUEROVÁ Jana 1 JANEČEK Miloš
Institutions:
1 Charles University, Department of Physics of Materials, Ke Karlovu 5, 121 16 Prague, Czech Republic, Jiri.Kozlik@seznam.cz
2 Czech Academy of Sciences, Institute of Thermomechanics, Dolejškova 5, 182 00 Prague, Czech Republic
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
1575-1581
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
10 views / 2 downloads
Abstract

Titanium alloys are materials exhibiting outstanding physical and functional properties. Metastable β titanium alloys are a prospective group featuring complex phase transformations which can be utilized to tailor the material performance. Microstructural mechanisms underlying phase transformations in this group of Ti alloys are not completely understood. In particular, the formation of different morphologies of ω phases is of major importance as the ω particles act as nucleation sites for the formation of stable α phase. In this study, we employ a finite element model (FEM) to account for the formation of two types of ω phase, namely, the ellipsoidal athermal ω phase and the lamellar stress-induced ω phase. The proposed model calculates elastic strain energies in β titanium containing either athermal or stress-induced ω phase and, thus, determines the preferential morphology of the formed ω phase in relation to the stress magnitude and direction.

Keywords: β titanium, ω phase, FEM, phase transformation
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