Fatigue and fretting fatigue of ion-nitrided 34CrNiMo6 steel |
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Authors: | J D Costa J M Ferreira A L Ramalho |
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Institution: | ICEMS, Faculty of Science and Technology, Department of Mechanical Engineering, University of Coimbra (DEM/FCTUC), Pinhal de Marrocos, 3030 Coimbra, Portugal |
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Abstract: | This work is concerned with the surface treatment (ion nitriding) of fretting fatigue and fatigue resistance of 34CrNiMo6. Tests are made on a servo-hydraulic machine under tension for both treated and non-treated specimens. The test parameters involve the applied displacements δ±80–±170 μm; fretting pressure σn=1000–1400 MPa; fatigue stress amplitude σa=380–680 MPa and stress ratio R=−1. The ion nitriding process improves both fatigue and fretting fatigue lives. Subsurface crack initiation from internal discontinuities was found for ion-nitrided specimens. |
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Keywords: | Fretting fatigue Surface treatments |
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