Abstract
Components of diesel engines are often subjected to cyclic loading at elevated temperature during operation, which may cause their fatal fatigue failure. In this study, elevated-temperature low-cycle fatigue (LCF) tests were conducted at 300 °C on Al-Si 356 cast alloys with Mo addition. Various strain amplitudes of 0.1, 0.2, 0.4 and 0.6% was applied. Results showed that a high volume of finer dispersoids formed with addition of Mo. Compared with the base alloy free of Mo, a higher fatigue strength but reduced plastic strain at all studied strain amplitudes was obtained in the alloy containing Mo. Smaller fatigue striation spacing was observed in Mo-containing alloy, indicating its better fatigue crack propagation resistance. However, the total LCF cycle at 300 °C in the alloy with Mo was moderately decreased due to the fast growth of crack to the final rupture. Fatigue parameters were calculated from test data for fatigue life estimation.
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Acknowledgements
The authors acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC) and Rio Tinto Aluminum through the NSERC Industry Research Chair in the Metallurgy of Aluminum Transformation at the University of Quebec at Chicoutimi.
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Chen, S., Liu, K., Chen, XG. (2020). Effect of Mo on Elevated-Temperature Low-Cycle Fatigue Behavior of Al-Si 356 Cast Alloy. In: Tomsett, A. (eds) Light Metals 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36408-3_37
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DOI: https://doi.org/10.1007/978-3-030-36408-3_37
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