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Mild Sliding Wear of Fe–0.2%C, Ti–6%Al–4%V and Al-7072: A Comparative Study

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Abstract

The mild sliding wear of Fe–0.2%C, Ti–6%Al–4%V and Al-7072 was investigated by means of pin-on-disc sliding tests. The applied pressure was 1 MPa and the sliding velocity was varied between 0.2 and 1 m/s. The sliding behaviour was followed by continuous measurements of the friction coefficient, pin wear and pin temperature. For the Fe alloy, wear was mixed (delamination and oxidation), and friction and wear coefficients were found to decrease with sliding velocity. The Al and Ti alloys displayed a different behaviour, characterised by the occurrence of sliding distance transitions at 0.8 and 1 m/s for the Al alloy, and at 0.4 up to 1 m/s for the Ti alloy. Before the transition, the wear coefficient of the Al alloy was very low, because of the presence of a compacted tribolayer on the sliding surface. After the transition wear was by delamination: the wear rate increased but the friction coefficient decreased. For the Ti alloy, wear occurred by oxidation and was quite high before the transition. After the transition, both the wear rate and the friction coefficient decreased, although the wear process became unstable with repeated oscillations in the friction coefficient. The results allowed us to highlight the role of flash temperature in determining the wear mechanisms of the alloys under study and the necessity of properly considering the sliding distance transitions to make reliable comparisons and obtain guidelines for safe operations.

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Acknowledgement

The authors acknowledge the contribution of Eddy Sandri for the experimental testing.

Author information

Correspondence to Giovanni Straffelini.

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Straffelini, G., Molinari, A. Mild Sliding Wear of Fe–0.2%C, Ti–6%Al–4%V and Al-7072: A Comparative Study. Tribol Lett 41, 227–238 (2011). https://doi.org/10.1007/s11249-010-9705-2

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Keywords

  • Unlubricated wear
  • Oxidative wear
  • Wear mechanisms
  • Steel
  • Aluminium
  • Titanium