Tribology Letters

, 66:47 | Cite as

Friction and Wear Characteristics of Single Crystal Ni-Based Superalloys at Elevated Temperatures

  • Pantcho Stoyanov
  • Lesley Dawag
  • Daniel G. Goberman
  • Dilip Shah
Original Paper
  • 103 Downloads

Abstract

The purpose of this study was to investigate the friction and wear behavior of single crystal superalloys at elevated temperatures. Pin-on-plate experiments were conducted using a custom-built high-temperature fretting/wear apparatus. Measurements were performed on two single crystal Ni-based alloys and Waspaloy® (used as a baseline material). The coefficient of friction for the single crystal materials (i.e., during running-in and steady state) was lower compared to the Waspaloy®. In addition, the experiments showed that the friction coefficient of the single crystal is dependent on the crystallographic plane; the friction coefficient was lower for the tests on the {100} plane compared to the {111} plane. The wear behavior was aligned with the friction behavior, where the single crystal Ni-based alloys showed slightly higher wear resistance compared to the Waspaloy®. Ex situ analysis by means of FIB/SEM and XPS analysis revealed the formation of Co-base metal oxide layer on the surface of the single crystal alloy. Similarly, a Co-base oxide layer is observed on the counterface providing a self-mated oxide-on-oxide contact and thus lower friction and wear compared to the Waspaloy®.

Keywords

Single crystal alloys Tribofilm Lubricious oxides 

Notes

Acknowledgements

The authors thank Dr. Agnieszka Wusatowska-Sarnek for the valuable discussions and suggestions on this topic.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Pantcho Stoyanov
    • 1
  • Lesley Dawag
    • 1
  • Daniel G. Goberman
    • 2
  • Dilip Shah
    • 1
  1. 1.Pratt & WhitneyUnited Technologies CorporationEast HartfordUSA
  2. 2.United Technology Research CenterUnited Technologies CorporationEast HartfordUSA

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