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

F. Xia; X.S. Gao; M.X. Liang; Y.C. Guo; J.P. Li; Z. Yang; J.L. Wang; L.L. Zhang

Journal of Materials Research and Technology (Nov 2020)

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

F. Xia,
X.S. Gao,
M.X. Liang,
Y.C. Guo,
J.P. Li,
Z. Yang,
J.L. Wang,
L.L. Zhang

Affiliations

F. Xia: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
X.S. Gao: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
M.X. Liang: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
Y.C. Guo: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
J.P. Li: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China; Corresponding author.
Z. Yang: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
J.L. Wang: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China
L.L. Zhang: Shannxi Province Engineering Research Center for Aluminium/Magnesium Light Alloy and Composites, China; Shaanxi Key Laboratory of Optoelectronic Functional Materials and Devices, China; School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, 710021, China

Journal volume & issue: Vol. 9, no. 6
pp. 12926 – 12935

Abstract

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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.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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