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2017 №04 (07) DOI of Article
10.15407/as2017.04.08
2017 №04 (09)

Automatic Welding 2017 #04
Avtomaticheskaya Svarka (Automatic Welding), #4, 2017, pp. 43-47
 
Influence of temperature of heating in vacuum on behaviour of oxide film on the surface of g-tial intermetallic alloy


 
 
Authors
Yu.V. Falchenko, L.V. Petrushinets and V.E. Fedorchuk
E.O. Paton Electric Welding Institute, NASU 11 Kazimir Malevich Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
The paper deals with the influence of temperature of heating in vacuum and soaking time on oxide film recovery on the surface of g-TiAl intermetallic alloy. Analysis of publications on diffusion welding of titanium aluminides showed a considerable scatter of parameters in welding modes recommended by the authors (temperature, pressure and process time). Influence of concentration of oxygen contained in oxide layer on contact surfaces of samples, on their adhesion during heating in vacuum was analyzed. It is experimentally established that with increase of the temperature of heating pre-oxidized samples of titanium aluminide from 900 up to 1200 °C, the nature of surface relief in the contact zone changes from flat to voluminous one. It is found that heating of oxidized samples of g-TiAl intermetallic alloy under vacuum at 1200 °C for 20 min at 5 MPa pressure allows reducing oxygen content in the butt joint 5 times from 40.99 to 6.12–7.74 wt.%. 18 Ref., 2 Tables, 7 Figures.
 
Keywords: g-TiAl intermetallic alloy, oxide, vacuum, heating temperature
 
 
Received:                16.03.17
Published:               17.04.17
 
 
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