Self-mated wear tests of X40 (Cobalt-base alloy) and Mar-M247 (Nickel base alloy) were conducted under unlubricated sliding conditions using a pin-on-disk tester. Wear maps were constructed for both alloys over the temperature range of room temperature to 1173 K at relatively low sliding speed. Microstructural and chemical information has been obtained by using various microscopies, an X-ray diffractometer, and an X-ray photo-electron spectroscopy. They show that the wear resistance of X40 is superior to that of Mar-M247 at room temperature due to the lower concentration of metallic state elements and higher concentration of Cr2O3 and Co (OH)2 at the surface of X40. The degradation in the wear resistance of X40 at about 500 K was attributed to the decrease in Cr2O3 and Co(OH)2 concentrations at the surface.

Issue Section:
Research Papers
Topics:
Alloys, Temperature, Wear, Wear resistance, X-rays, Cobalt, Disks, Nickel, Photoelectron spectroscopy, Wear testing
1.
Cowan, Richard S., and Winer, Ward O., 1992, “Frictional Heating Calculations,” ASM Handbook Vol. 18, Friction, Lubrication and Wear Technology, ASM International, pp. 39–44.
2.
Crook, P., and Li, C. C., 1983, “The Elevated Temperature Metal-to-Metal Wear Behavior of Selected Hardfacing Alloys,” Wear of Materials 1983, K. C. Ludema, ed., ASME, pp. 272–278.
3.
Crook, P., and Levy, A. V., 1992, “Friction and Wear of Cobalt-Base Wrought Alloys,” ASM Handbook Vol. 18, Friction, Lubrication and Wear Technology, ASM International, pp. 766–771.
4.
Holm
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6.
Ocken, H., 1985, “Wear Tests of Low-cobalt Alloys for Hardfacing Nuclear Components,” Wear of Materials 1985, K. C. Ludema, ed., ASME, pp. 529–538.
7.
Stott
F. H.
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Stevenson
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Wood
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1977
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Friction and Wear Properties of Stellite 31 at Temperatures From 293 to 1073 K
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8.
Stott, F. H., and Wood, G. C., 1978, “The Influence of Oxides on the Friction and Wear of Alloys,” Tribology International, Aug., pp. 211–218.
9.
1991, Aerospace Structural Metals Handbook, Metals and Ceramics Information Center, Vol. 5.
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