Fatigue and fretting fatigue of ion-nitrided 34CrNiMo6 steel

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; frettin...

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Bibliographic Details
Published in:Theoretical and applied fracture mechanics 2001, Vol.35 (1), p.69-79
Main Authors: Costa, J.D, Ferreira, J.M, Ramalho, A.L
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Fatigue
Fretting fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Surface treatments
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Summary: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 σ n=1000–1400 MPa; fatigue stress amplitude σ a=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.
ISSN:0167-8442
1872-7638
DOI:10.1016/S0167-8442(00)00050-1