Surface Modification of Powder Metallurgy Components With a Direct Diode Laser

Barnes, Stuart J.; Nash, Michael J.; Kwok, Y.K.

doi:10.1115/1.1605111

Cited by 2 publications

(1 citation statement)

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“…Mechanical compacting is one of the practices that meet these requirements. There are many literary references [3,4] confirming this. Mostly the methods of shot peening or deep rolling were used.…”

Section: Introductionmentioning

confidence: 77%

Contact-Fatigue Resistance of PM Steel with Hard Coatings

Čerňan

Pecho

Škultéty

et al. 2021

KEM

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Hard coatings applied by the Physical Vapor Deposition method often provide very good mechanical properties, especially when applied to metal parts that are mentioned to withstand certain level of wear. In this study, TiN coating combined with deep rolling were applied to the investigated steel samples, prepared by powder metallurgy and subjected to contact-fatigue stress. Computational analysis of stress states in samples by the finite element method helped to reveal the behavior and formation of fatigue failures when loading samples. The results, processed in the form of fatigue curves, probabilistic Weibull curves using metallography and electron microscopy, showed a positive effect of the used coatings and their combination with other surface treatments on the contact-fatigue strength of the examined samples. Microscopic study also showed the different mechanisms of crack formation and of crack propagation rate due to contact loading of material with a laser hardened surface, which has an obvious impact on material lifetime.

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Section: Introductionmentioning

confidence: 77%