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Microstructure of Ti-45Al-8.5Nb-0.2W-0.03Y electron beam welding joints.
- Source :
-
Journal of Materials Processing Technology . Dec2017, Vol. 250, p401-409. 9p. - Publication Year :
- 2017
-
Abstract
- High Nb containing TiAl alloys showed susceptibility to cold cracking when welding was performed without preheating and post-heating; however, crack-free welds could be made with pre- and post-heating. The room-temperature strength of the crack-free welds was 480 MPa, and failure occurred in the base metal. The fusion zone obtained at a beam current of 7 mA mainly comprised coarse β/B2-phase grains, with acicular α 2 and γ phases distributed at the grain boundaries. The fusion zone obtained at 13 mA mainly contained fine γ- and α 2 -phase grains. The fusion zone obtained with pre- and post-heating was dominated by the acicular α phase, reticular β/B2 phase, and blocky γ phase. The heat-affected zone could be divided into two characteristic regions according to the morphologies of the α 2 and γ phases. Changes in microhardness were analyzed with respect to the phase composition and microstructural morphology. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09240136
- Volume :
- 250
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Processing Technology
- Publication Type :
- Academic Journal
- Accession number :
- 124721295
- Full Text :
- https://doi.org/10.1016/j.jmatprotec.2017.07.004