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Microstructural characterization and formation of alpha ' martensite phase in Ti-6Al-4V alloy butt joints produced by friction stir and gas tungsten arc welding processes

Mohsen Esmaily (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Seyedeh Nooshin Mortazavi (Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik) ; P. Todehfalah ; M. Rashidi
Materials & Design (0261-3069). Vol. 47 (2013), p. 143-150.
[Artikel, refereegranskad vetenskaplig]

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 bimodal microstructure was just obtained in the FSWed sample with a peak temperature below beta transus temperature (T < 995 degrees C). alpha' martensite phase, which is an acicular and strengthening phase in this alloy, was only observed in FSWed specimens.

Nyckelord: Titanium alloys, Friction stir welding, Gas tungsten arc welding, alpha ' Martensite phase



Denna post skapades 2013-03-21. Senast ändrad 2014-03-21.
CPL Pubid: 174881

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Ämnesområden

Materialteknik

Chalmers infrastruktur