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Influence of Microstructure and Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

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Abstract:

Based on the fatigue crack propagation experiments did by A.-L. Gloanec et al., the fatigue crack propagation rates of TiAl alloy of two processing routes, namely casting and PM, and stress ratios had been tested, in order to find out the effects of microstructure and stress ratio. An improved fatigue crack propagation formula for region Ⅱ (the expansion region) was derived according to Paris formula. The specific values of the constants in the formula were calculated. Fatigue crack propagation resistance of nearly fully lamellar microstructure is superior to that of equiaxed γ grain. The experimental results present that both microstructure and stress ratio has a significant influence on fatigue crack growth rate.

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Periodical:

Advanced Materials Research (Volumes 881-883)

Pages:

1330-1333

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.881-883.1330

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Cite this paper

Online since:

January 2014

Authors:

Yan Rui Zuo, Zhi Yuan Rui, Rui Cheng Feng*, De Chun Luo, Chang Feng Yan

Keywords:

Fatigue Crack Propagation, Microstructure, Stress Ratio, TiAl Alloys

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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