Scuffing Performance of M50 Bearing Steel Lubricated with a Gas Turbine Engine Oil at High Sliding Speeds

Martin, Matthias; Alanou, M. P.; Evans, Henry Peredur; Snidle, Raymond Walter; Kamamura, H.; Dodd, A.

doi:10.1080/10402000108982482

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…These values only apply for a perfectly lubricated system under full elastohydrodynamic conditions, but the real situation can be more complex. Excessive roughness of the component surfaces 31,32 or starved lubrication conditions 33,34 will lead to asperity contact and metal on metal traction. Under these circumstances, gross sliding can occur within the contact zone and the maximum shear stress shifts towards the contact surface.…”

Section: Bearing Design and Applicationmentioning

confidence: 99%

Bearing steel microstructures after aircraft gas turbine engine service

Nygaard

Rawson

Danson

et al. 2014

Materials Science and Technology

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The microstructure of aircraft gas turbine engine bearing steel has been characterised after service in Rolls-Royce Trent™ engines, with the focus on surface condition and the consequences of sliding contact. Carbide populations at the surfaces of rolling elements are found depleted by 30% after 30 000 h engine service. A single ball failure occurred after this period, leading to fatigue spalling that initiated below the contact surface. Comparisons between unused bearing raceways and those that have experienced service revealed that the microstructures resulting from secondary hardening remain remarkably stable. Plastic flow along the direction of rolling is confined to a shallow zone <2 μm beneath the contact surfaces. Transmission electron microscopy has revealed a new deformation mechanism in these bearing steels, in the form of mechanical twinning at interfaces and prior austenite grain boundaries. It is demonstrated that workhardening occurs to a depth of 1 mm in the raceway that has experienced 30000 h service.

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Section: Bearing Design and Applicationmentioning

confidence: 99%

Bearing steel microstructures after aircraft gas turbine engine service

Nygaard

Rawson

Danson

et al. 2014

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…The mechanism of scuffing failure is complicated. Several prediction criteria have been proposed such as the critical contact temperature [1], critical flash temperature [2], friction power intensity [3], film breakdown [4][5][6], adsorption reaction [7][8][9], EHL film-breakdown and surface roughness effect [10][11][12]. However, there is no widely acceptable method so far.…”

Section: Introductionmentioning

confidence: 99%