Effect of thermal exposure on microstructure and high-temperature fatigue life of Al-Si piston alloys

A very effective approach is proposed here to increase the high-temperature fatigue life of an Al-Si piston alloy. Compared with traditional T6 heat treatment, the high-temperature fatigue life can be improved by three times of magnitude with thermal exposure treatment, which reduces the negative ef...

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Veröffentlicht in:Journal of materials research and technology 2020-11, Vol.9 (6), p.12926-12935
Hauptverfasser: Xia, F., Gao, X.S., Liang, M.X., Guo, Y.C., Li, J.P., Yang, Z., Wang, J.L., Zhang, L.L.
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Sprache:eng
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Zusammenfassung:A very effective approach is proposed here to increase the high-temperature fatigue life of an Al-Si piston alloy. Compared with traditional T6 heat treatment, the high-temperature fatigue life can be improved by three times of magnitude with thermal exposure treatment, which reduces the negative effects of gradually decreasing high-temperature fatigue life due to over-aging of piston durability. Specimens heat-treated by various processes have been tested in a rotating bending test machine under conditions of 50 MPa, 350 °C, and 80 Hz to observe the effects of thermal exposure on microstructure and high-temperature fatigue life. The thermal exposure treatment provides an effective method to optimize Si and the thermally stable phases of δ-Al3CuNi and γ-Al7Cu4Ni. It is one of the most important methods for improving the high- temperature fatigue life of an Al-Si piston alloy.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2020.09.018