Formation and evolution of precipitates in an additively manufactured near-α titanium base alloy

Christian Fleißner-Rieger, Hannah Schönmaier, Michael Musi, Manfred Stadler, Harald Gschiel, Christoph Turk, Tanja Pfeifer, Helmut Clemens

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

Titanium base alloys are frequently used in laser powder bed fusion manufacturing processes and enable the production of lightweight and complex components. This study describes the influence of the heat input and various post-process heat treatments on the martensite formation and its decomposition in an additively manufactured Ti-6Al-2Sn-4Zr-2Mo-Si alloy. The change of the martensite crystal structure from orthorhombic to hexagonal, caused by additional heat input, was proven by high-energy X-ray diffraction. It is shown that the heat input of the laser affects the diffusion of alloying elements such as Mo and Si. This behavior was investigated by atom probe tomography, which confirms clustering of Mo and Si at dislocations and grain boundaries, and allows for linking the heat input during the manufacturing process with the morphology of the observed clusters. Moreover, particular emphasis is laid on explaining the formation mechanism of (Ti,Zr) 6Si 3 silicide particles during a subsequent heat treatment.

OriginalspracheEnglisch
Aufsatznummer101366
Seitenumfang6
FachzeitschriftMaterialia
Jahrgang21.2022
AusgabenummerMarch
Frühes Online-Datum14 Feb. 2022
DOIs
PublikationsstatusVeröffentlicht - März 2022

Bibliographische Notiz

Funding Information:
The authors thank Francisca Mendez-Martin for her advice and help during the APT measurements and Manfred Brabetz for conducting TEM diffraction experiments. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III and we would like to thank Andreas Stark and Peter Staron for their assistance. Beamtime was allocated for proposal I-20210846 EC. M. Musi is a recipient of a DOC Fellowship from the Austrian Academy of Sciences at the Department of Materials Science, Montanuniversität Leoben.

Funding Information:
The authors thank Francisca Mendez-Martin for her advice and help during the APT measurements and Manfred Brabetz for conducting TEM diffraction experiments. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III and we would like to thank Andreas Stark and Peter Staron for their assistance. Beamtime was allocated for proposal I-20210846 EC. M. Musi is a recipient of a DOC Fellowship from the Austrian Academy of Sciences at the Department of Materials Science, Montanuniversit?t Leoben.

Publisher Copyright:
© 2022 The Author(s)

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