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Metals 2016, 6(7), 159; doi:10.3390/met6070159

Contact Properties and Wear Behaviour of Nickel Based Superalloy René 80

Politecnico di Torino—Dipartimento di Ingegneria Meccanica e Aerospaziale, Corso Duca degli Abruzzi, 24, Torino 10129, Italy
Academic Editor: Jonathan Cormier
Received: 23 May 2016 / Revised: 5 July 2016 / Accepted: 6 July 2016 / Published: 12 July 2016
(This article belongs to the Special Issue Ni- and Co-Based Superalloys and Their Coatings)
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Abstract

A superalloy traditionally offers excellent mechanical strength, resistance to thermal creep deformation, good surface stability and resistance to corrosion or oxidation. However, a superalloy often also needs performance in terms of fretting resistance. Experimental results regarding fretting wear and contact properties of the superalloy René 80 are illustrated and discussed. The widespread applications of superalloys in jointing with friction as in the jointing of a turbine blade, is the main motivation for characterizing their fretting behaviour. The fretting experiments were performed at 100 Hz for two temperatures (600, 800 °C), and two sliding amplitudes (30, 60 µm). These temperatures and strokes are typical at the medium stage of a low-pressure gas turbine. Wear volume and the contact properties such as friction coefficient and tangential contact stiffness were measured and analysed. Results show that the lowest friction coefficient was measured at the temperature of 800 °C. This temperature hence appears to be an optimum working condition for the fretting wear of René 80. With regard to wear mechanism, a fundamental role of the sliding amplitude was found. In particular, the ratio between the sliding amplitude and the characteristic contact length has a significant influence upon the oxide growth on contact surfaces. View Full-Text
Keywords: contact properties; friction coefficient; contact stiffness; fretting; wear; superalloy; René 80 contact properties; friction coefficient; contact stiffness; fretting; wear; superalloy; René 80
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lavella, M. Contact Properties and Wear Behaviour of Nickel Based Superalloy René 80. Metals 2016, 6, 159.

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