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Effect of Alloying Elements on Friction and Wear Performance of Novel Co-Al-W Superalloys
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    Abstract:

    Novel Co-Al-W superalloy is a novel Co-base superalloy, with the precipitation strengthening by a ternary compound γ′-Co3(Al,W) phase on γ-Co matrix. The effect of alloying element Mo, Nb, Ta and Ti on friction and wear performance of Co-Al-W superalloys at room temperature was studied by THT07-135 type friction and wear tester and SEM, and cobalt-based Stellite 6 alloy was employed for comparison. Results show that the friction coefficient of 9.8W superalloy is smaller than that of cobalt-based Stellite 6. Alloying elements Mo, Nb and Ti can moderately reduce wear mass loss and friction coefficient of 9.8W superalloy, and improve the wear resistance. The Mo, Ti and Nb elements can clearly improve the wear resistance of 9.8W superalloy while the effect of Ta element is not obvious. The wear mechanism of Co-Al-W superalloy is mainly oxidation and abrasive wear, while that of Stellite 6 alloy mainly is delamination and abrasive wear.

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[Xu Yangtao, Xia Tiandong, Zhao Wenjun, Wang Xiaojun. Effect of Alloying Elements on Friction and Wear Performance of Novel Co-Al-W Superalloys[J]. Rare Metal Materials and Engineering,2013,42(1):75~79.]
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  • Received:January 20,2012
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