Theoretical and experimental study of the contact fatigue behavior of a Mo–Cu steel produced by powder metallurgy

Metinöz, Ibrahim; Cristofolini, I.; Pahl, W.; DeNicolo, A.; Marconi, P.; Molinari, A.

doi:10.1016/j.msea.2014.07.009

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…Therefore, the temperature of the area close to the coating/substrate interface promotes the melting of some areas where a higher solute concentration develops and locally alters the liquidus (solidus) T of the alloy [20]. At the same time, the rapid cooling due to the electrospark process induces a large thermal strain, which opens the liquated zones [12,[85][86][87][88].…”

Section: Substrate/coating Interface Behaviormentioning

confidence: 99%

Advancements in Electrospark Deposition (ESD) Technique: A Short Review

Barile¹,

Casavola²,

Pappalettera³

et al. 2022

Coatings

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The need to use components with improved surface characteristics in relation to severe operating conditions, together with the aim of cost reduction associated with the replacement of damaged components, has led to an increasing use of coatings and repairing processes. The most common deposition processes are generally characterized by high equipment costs and, sometimes, by long deposition time. Furthermore, some repair technologies, especially those characterized by high heat input, are not suitable for alloys used in aerospace applications due to the degradation of their mechanical characteristics. In the last decades, a novel eco-friendly method capable of overcoming the limits set out above emerged: the electrospark deposition (ESD) technology. Thanks to its efficiency, simplicity, cost-effectiveness, and low heat input, this technology has proved to be suitable both for improving surface properties, such as thermo and wear resistance, higher hardness and corrosion resistance, and for the repair of high-value components. The aim of this review is to describe in detail some aspects of the ESD technique to understand the ESD processing preparation of alloys normally considered difficult to weld by traditional processes and to give some important clues to the readers to contribute to the defect-free repair of damaged areas and coatings deposition.

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Section: Substrate/coating Interface Behaviormentioning

confidence: 99%

Advancements in Electrospark Deposition (ESD) Technique: A Short Review

Barile¹,

Casavola²,

Pappalettera³

et al. 2022

Coatings

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show abstract

“…In lubricated rolling and rolling-sliding contacts, the main damage mechanism is contact fatigue that occurs through the nucleation of a subsurface crack, its propagation towards the surface and the formation of metallic debris. The resistance of porous sintered steels to this damage mechanism has been investigated in previous works, proposing a theoretical model to predict the nucleation of the subsurface crack [1][2]. The model is based on a conservative approach, starting from the assumption that crack nucleation is anticipated by local plastic deformation [3].…”

Section: Introductionmentioning

confidence: 99%

Surface Hardening Vs. Surface Embrittlement in Carburizing of Porous Steels

Mekonone

Cristofolini

Pahl

et al. 2018

Powder Metallurgy Progress

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Carburizing increases the contact fatigue resistance of sintered steels, but the surface hardening may result the formation of surface brittle cracks due to the combined effect of high hardness and porosity. The effect of carburizing on the embrittlement of the case of a 7.3 g/cm3 1.5%Mo - 0.25%C sintered steel was studied. The phenomenon was analyzed theoretically and verified by experiments. The resistance of the carburized steel to surface brittle cracking increases with the load bearing surface and the decrease of the maximum pore size, of the surface microhardness and the friction coefficient. The theoretical analysis was implemented in a design procedure for parts subject to contact stresses.

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“…A crack nucleates at the Hertzian depth and propagates first parallel to the surface, then towards it, leading to the formation of a metallic fragment [1,2]. This phenomenon has been investigated in a previous work [3] with a theoretical approach validated by wear tests, aimed at predicting the nucleation of the crack on different diffusion bonded steels and highlighting the influence of the microstructure heterogeneity in the Ni steels. The same model was then refined to investigate the surface damage mechanisms in carburised pre-alloyed steels and the effect of shot peening [4,5].…”

Section: Introductionmentioning

confidence: 99%

Influence of the microstructure on the subsurface and surface damage during lubricated rolling–sliding wear of sintered and sinterhardened 1.5%Mo–2%Cu–0.6%C steel: theoretical analysis and experimental investigation

Mekonone

Pahl²,

Molinari

2018

Powder Metallurgy

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The influence of the microstructure on density on the resistance to subsurface and surface damage, during lubricated rolling-sliding wear of a 1.5%Mo-2%Cu-0.65%C sintered and sinterhardened steel, was investigated. The nucleation of subsurface contact fatigue cracks and the occurrence of surface plastic deformation due to surface stresses were studied through a theoretical analysis and confirmed through wear tests. The expected positive effect of density and sinterhardening was confirmed. Moreover, the resistance of the steel to the two damage mechanisms investigated depends on the microstructural heterogeneity. The theoretical model for subsurface and for surface damage may be used to predict the resistance of the material but, depending on the distribution of the microstructural constituents, either a local or a mean approach in defining the properties of the metallic matrix has to be used.

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Theoretical and experimental study of the contact fatigue behavior of a Mo–Cu steel produced by powder metallurgy

Cited by 14 publications

References 11 publications

Advancements in Electrospark Deposition (ESD) Technique: A Short Review

Advancements in Electrospark Deposition (ESD) Technique: A Short Review

Surface Hardening Vs. Surface Embrittlement in Carburizing of Porous Steels

Influence of the microstructure on the subsurface and surface damage during lubricated rolling–sliding wear of sintered and sinterhardened 1.5%Mo–2%Cu–0.6%C steel: theoretical analysis and experimental investigation

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