Effect of dwell time on creep-fatigue life of a high-Nb TiAl alloy at 750°C

[Display omitted] The creep-fatigue life of a cast Ti-45Al-8.0Nb-0.2W-0.2B-0.1Y (at.%) alloy was investigated at 750°C by the consideration of effective dwell time. The life to failure decreases linearly with the increase of effective dwell time, and decreases exponentially with the increase of mini...

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Bibliographic Details
Published in:Scripta materialia 2015-12, Vol.109, p.61-63
Main Authors: Yu, Long, Song, Xiping, You, Li, Jiao, Zehui, Yu, Huichen
Format: Article
Language:English
Subjects:
Creep
Dwell time
Fatigue
Lifetime
Titanium aluminides
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Summary:[Display omitted] The creep-fatigue life of a cast Ti-45Al-8.0Nb-0.2W-0.2B-0.1Y (at.%) alloy was investigated at 750°C by the consideration of effective dwell time. The life to failure decreases linearly with the increase of effective dwell time, and decreases exponentially with the increase of minimum creep rate. A linear formula and a power-law formula for the life prediction of creep-fatigue were proposed. Both creep-fatigue life prediction formulae have a good agreement with the experimental data.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.07.018