Fatigue failure of all-steel and steel–silicon nitride rolling ball combinations

Mosleh, Mohsen; Bradshaw, Keron; Belk, John H.; Waldrop, John C.

doi:10.1016/j.wear.2010.12.051

Cited by 23 publications

(11 citation statements)

References 18 publications

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“…The lubricant was provided to the contact point by rolling of the lower balls in the pool that carried it to the contact point. In such situations, the "reduced" film thickness was calculated based on a formula in the literature [7].…”

Section: State Of Lubrication and Reduced Film Thicknessmentioning

confidence: 99%

“…The RCF in concentrated contacts, such as rolling bearings, is either near-surface-initiated or subsurface-initiated [5]. In the near-surface-initiated RCF, the surface roughness has a profound effect on the fatigue life-especially at low lambda (λ), which is the ratio of film thickness to composite surface roughness [6,7]. Various parameters, such as arithmetic mean roughness R a , root mean square roughness R q , maximum valley depth R v , maximum peak height R p , and peak-to-valley roughness R z , are commonly used to describe the amplitude characteristics of the surface topography and asperities.…”

Section: Introductionmentioning

confidence: 99%

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Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride

et al. 2019

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An experimental analysis of the role of surface roughness parameters on micropitting and the succeeding rolling contact fatigue (RCF) of silicon nitride against AISI 52100 steel under lubricated conditions was performed. In accelerated fatigue tests using a four-ball tester, the arithmetic mean, root mean square, and peak-to-valley roughnesses of silicon nitride surfaces varied, while the roughness of the steel surface was unchanged. The correlation between the fatigue life and roughness parameters for silicon nitride was obtained. The peak-to-valley roughness was the roughness parameter that dominantly affected the RCF life of silicon nitride. The micropitting of surfaces leading to fatigue intensified as the roughness was increased. Extensive micropitting was observed on the rolling track beyond the trailing edge of the spall region in the circumferential direction.

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Section: State Of Lubrication and Reduced Film Thicknessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride

et al. 2019

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“…The silicon nitride is hard (76-80 HRC) and has a density (3.27 g cm -3 ) which is much lower than that of steel. 47) Its large elastic modulus (310 GPa) leads to a small contact area which in one sense is an advantage if it leads to less microscopic sliding. However, the fracture toughness of the ceramic can be a problem with rapid rolling element crumbling initiated by surface damage under continued operation.…”

Section: Hybrid Bearingmentioning

confidence: 99%

Duplex Hardening of Steels for Aeroengine Bearings

Ooi

Bhadeshia

2012

ISIJ Int.

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Duplex hardening is a process in which conventional heat-treatments such as secondary or case hardening are followed up by surface nitriding to achieve exceptional properties, particularly in the context of aeroengine bearings. Hardness values in excess of 1 000 HV can in principle be achieved, and although the hardness decreases as a function of depth below the surface, some level of enhancement can occur to a depth of up to 0.2 mm. The process can be applied to both through hardened and case hardened bearing steels such as M50 and M50NiL respectively, with concomitant increases in rolling contact fatigue resistance and tribological properties. The process has not yet been universally adopted and is ripe for a critical assessment.

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“…Silicon nitride (Si 3 N 4 ) ceramics have excellent properties such as high strength, high hardness, wear resistance, heat resistance, electrical insulation and selflubrication, which is an ideal material for rolling elements used in bearings [1,2]. The bearings with Si 3 N 4 ceramic balls or rollers are particularly suitable for working under high-speed, cryogenic or hightemperature, low-torque, and oil-lean lubrication conditions, such as spindle bearings in precision machine tools, windmill generator bearings and aerospace bearings [3,4]. Si 3 N 4 is a compound with strong covalent bond and low self-diffusion coefficient.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size of Y2O3-Al2O3 additives on microstructure and mechanical properties of Si3N4 ceramic balls for bearing applications

Zhang

Wang²,

Sun

et al. 2021

PAC

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Si3N4 ceramic balls were prepared by gas pressure sintering with Y2O3 and Al2O3 as sintering additives. The effects of particle size of Y2O3-Al2O3 additives on densification, microstructure and mechanical properties of Si3N4 ceramic balls were investigated. The reliability of Si3N4 ceramic balls was evaluated through the Weibull modulus. The results showed that Si3N4 ceramic balls containing nanosized Y2O3-Al2O3 additives have a higher relative density and better comprehensivemechanical properties compared with the samples containing microsized additives, with relative density of 98.9 ? 0.2%TD, Vickers hardness of 14.7 ? 0.1GPa, indentation fracture toughness of 6.5 ? 0.1MPa?m1/2 and crushing strength of 254 ? 8.5MPa. The more homogeneous and extensive dispersion of the nanosized sintering additives in the Si3N4 matrix is the main reason for the enhancement in density and mechanical properties of the Si3N4 ceramic balls.

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Fatigue failure of all-steel and steel–silicon nitride rolling ball combinations

Cited by 23 publications

References 18 publications

Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride

Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride

Duplex Hardening of Steels for Aeroengine Bearings

Effect of particle size of Y2O3-Al2O3 additives on microstructure and mechanical properties of Si3N4 ceramic balls for bearing applications

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