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Open AccessArticle

Production-Related Surface and Subsurface Properties and Fatigue Life of Hybrid Roller Bearing Components

1
Institute of Production Engineering and Machine Tools, Leibniz University Hannover, An der Universität 2, 30823 Garbsen, Germany
2
Institute of Machine Design and Tribology, Leibniz University Hannover, An der Universität 1, 30823 Garbsen, Germany
*
Author to whom correspondence should be addressed.
Metals 2020, 10(10), 1339; https://doi.org/10.3390/met10101339
Received: 25 August 2020 / Revised: 29 September 2020 / Accepted: 3 October 2020 / Published: 7 October 2020
(This article belongs to the Special Issue Hybrid Bulk Metal Components)
By combining different materials, for example, high-strength steel and unalloyed structural steel, hybrid components with specifically adapted properties to a certain application can be realized. The mechanical processing, required for production, influences the subsurface properties, which have a deep impact on the lifespan of solid components. However, the influence of machining-induced subsurface properties on the operating behavior of hybrid components with a material transition in axial direction has not been investigated. Therefore, friction-welded hybrid shafts were machined with different process parameters for hard-turning and subsequent deep rolling. After machining, subsurface properties such as residual stresses, microstructures, and hardness of the machined components were analyzed. Significant influencing parameters on surface and subsurface properties identified in analogy experiments are the cutting-edge microgeometry, S¯, and the feed, f, during turning. The deep-rolling overlap, u, hardly changes the residual stress depth profile, but it influences the surface roughness strongly. Experimental tests to determine fatigue life under combined rolling and rotating bending stress were carried out. Residual stresses of up to −1000 MPa, at a depth of 200 µm, increased the durability regarding rolling-contact fatigue by 22%, compared to the hard-turned samples. The material transition was not critical for failure. View Full-Text
Keywords: tailored forming; hybrid bearing; residual stresses; X-ray diffraction; rolling contact fatigue; bearing fatigue life tailored forming; hybrid bearing; residual stresses; X-ray diffraction; rolling contact fatigue; bearing fatigue life
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Breidenstein, B.; Denkena, B.; Krödel, A.; Prasanthan, V.; Poll, G.; Pape, F.; Coors, T. Production-Related Surface and Subsurface Properties and Fatigue Life of Hybrid Roller Bearing Components. Metals 2020, 10, 1339.

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