Torsional fretting and torsional sliding wear behaviors of CuNiAl against 42CrMo4 under dry condition

• Published in: Tribology international Vol. 118; pp. 11 - 19
• Main Authors: Zhang, Po, Lu, Wenlong, Liu, Xiaojun, Zhai, Wenzheng, Zhou, Mingzhuo, Zeng, Wenhan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2018; Elsevier BV
• Subjects: Abrasion; Chromium molybdenum steels; Coefficient of friction; Debris; Deformation mechanisms; Fretting; Friction; Frictional wear; Lubrication; Oxidation; Plastic deformation; Sliding friction; Strain hardening; Torsion; Torsional fretting; Torsional sliding; Ultrasonic testing; Wear mechanism; Wear mechanisms; Wear particles; Wear rate; Wear mechanism; Torsional fretting; Friction; Torsional sliding
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2017.09.022

Many wear failures are caused by a combination of fretting wear and sliding wear. In this study, the torsional fretting and torsional sliding wear properties of CuNiAl against 42CrMo4 were comparatively investigated under dry condition using a flat on flat contact tester. Experimental results showed that the sliding friction coefficients declined more dramatically than the fretting friction coefficients when the normal load increased. The fretting wear rate was lower than the sliding wear rate, which was partly due to the solid lubrication effect of the wear debris and strain hardening of the worn surfaces. The dominant wear mechanisms for the fretting tests were oxidation, cracks and delamination, while for the sliding tests were abrasion combined with plastic deformation. •Torsional fretting and torsional sliding wear were comparatively investigated.•The increase of normal load lead to a more dramatic decrease of sliding friction coefficient.•The fretting wear rate were much lower than the sliding wear rate.•Strain hardening of the fretting wear track was more serious than the sliding wear track.