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Erschienen in: Metallurgical and Materials Transactions A 4/2017

17.01.2017

Improving the Mechanical Properties of the Fusion Zone in Electron-Beam Welded Ti-5Al-5Mo-5V-3Cr Alloys

verfasst von: Christopher J. Marvel, Joseph C. Sabol, Timotius Pasang, Masashi Watanabe, Wojciech Z. Misiolek

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 4/2017

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Abstract

It is well-known that ω-phase precipitates embrittle Ti-5553 alloys and that ω-phase embrittlement can be overcome with appropriate heat treatments. However, the microstructural evolution of electron-beam welded Ti-5553 is not as understood as compared to the cast or wrought material. This study compared the microstructures of as-welded and post-weld heat-treated specimens by scanning and transmission electron microscopy, and similarly compared the localized mechanical behavior of the fusion zones with microhardness testing and digital image correlation coupled tensile testing. The primary observations were that the embrittling ω-phase precipitates formed upon cooling, and could not be fully solutionized in a single-step treatment of 1077 K (804 °C) for 1 hour. It was also discovered that nanoscale α-phase precipitates nucleated after the single-step treatment, although they were small in number and sparsely distributed. However, a two-step heat treatment of 1077 K (804 °C) for 1 hour and 873 K (600 °C) for 4 hours completely solutionized the ω-phase and produced a dense network of 2-μm-wide α-phase plates, which significantly improved the mechanical properties. Overall, this study has shown that post-weld heat treatments improve the strength and ductility of electron-beam welded Ti-5553 alloys by controlling ω- and α-phase evolution.

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Metadaten
Titel
Improving the Mechanical Properties of the Fusion Zone in Electron-Beam Welded Ti-5Al-5Mo-5V-3Cr Alloys
verfasst von
Christopher J. Marvel
Joseph C. Sabol
Timotius Pasang
Masashi Watanabe
Wojciech Z. Misiolek
Publikationsdatum
17.01.2017
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 4/2017
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-017-3968-2

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