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Microstructural characterization and formation of α' martensite phase in Ti-6Al-4V alloy butt joints produced by friction stir and gas tungsten arc welding processes
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2013 (English)In: Materials and Design, ISSN 0261-3069, Vol. 47, 143-150 p.Article in journal (Refereed) Published
Abstract [en]

The obtained microstructures of a Ti-6Al-4V alloy welded by Gas Tungsten Arc Welding (GTAW) and Friction Stir Welding (FSW) were investigated and evaluated quantitatively. In the GTAW method, the effect of current was examined so that the samples were subjected to various currents between 90 and 120. A. In the FSW process, samples were welded by different rotational speeds (450-850. rpm). Non-destructive tests including Visual and Radiography Tests (VT and RT) were used to identify defect-free samples. The microstructural studies by electron microscopes revealed formation of different phases in the weld area of the samples welded via mentioned methods. The recorded peak temperatures in the weld regions compared favorably with the expectations about the evolved microstructures. A bi-modal microstructure was just obtained in the FSWed sample with a peak temperature below β transus temperature (T<995°C). α' martensite phase, which is an acicular and strengthening phase in this alloy, was only observed in FSWed specimens.

Place, publisher, year, edition, pages
2013. Vol. 47, 143-150 p.
Keyword [en]
α' Martensite phase, Friction stir welding, Gas tungsten arc welding, Titanium alloys
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-118280DOI: 10.1016/j.matdes.2012.12.024ISI: 000315336200021ScopusID: 2-s2.0-84872480776OAI: diva2:605733

QC 20130215

Available from: 2013-02-15 Created: 2013-02-14 Last updated: 2013-03-25Bibliographically approved

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Rashidi, Masoud
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