HIGH-TEMPERATURE FRICTION AND WEAR BEHAVIOR OF A NI-BASED VALVE ALLOY

Zhi-Yuan Zhu, Jia-Huan Chen, Yuan-Fei Cai and Jian-Qiang Li
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Zhi-Yuan Zhu: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
Jia-Huan Chen: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
Yuan-Fei Cai: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China
Jian-Qiang Li: School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China

Surface Review and Letters (SRL), 2019, vol. 26, issue 10, 1-7

Abstract: This study explored the friction and wear behavior of a Ni-based exhaust valve at high temperatures. Nickel-based superalloy was used with two types of processing states: the original forged sample and the sample under the standard T1 heat treatment. At room temperature and a loading force of 10N, the average friction coefficient of the T1 heat-treated specimen is 0.61, which was lower than that of the forged sample (0.78). The wear rate of this specimen was also lower than that of the forged sample at the same temperature and loading force. Thus, T1 heat treatment can significantly improve the wear resistance of the alloy because of γ′ phase and carbides. The wear rate was the minimum at 550∘C and increased again at 750∘C dominated by the formation and flake-off of the oxide film.

Keywords: A Ni-based valve alloy; solid solution aging treatment; friction coefficient; wear rate; wear mechanism (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X19500744

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