Residual Stresses and Material Behavior of M50NiL and RBD

Böhmer, H-J

doi:10.1520/stp24822s

Cited by 11 publications

(5 citation statements)

References 13 publications

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“…The hot-hardness of aerospace bearing steels, both for the core and carburised case. 21,[80][81][82] Values for 52100 steel are presented for comparison. The terms 'case' and 'core' apply only to M50 NiL and RBD.…”

Section: Tribological Challenges Of M50 Steel Applicationsmentioning

confidence: 99%

Enhancing the tribological and mechanical properties of M50 steel using solid lubricants – A detailed review

Essa

Zhang

Huang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Recent strides in contact mechanics of M50 steel offer unique opportunities for better and more control of its tribological behavior and mechanical properties under different contact and surrounding conditions. Most researchers have focused on the solid lubricants on M50 steel as the key strategy for improving the tribological properties. In this paper, we have selected a wide range of previous late studies to discuss the different mechanisms leading to an improvement in the tribological properties of M50 steel via solid lubricants. A discussion of M50 steel industrial applications is also reviewed. The main objective is to develop an exhaustive understanding of the tribological behavior of M50 steel with solid lubricant additives under different conditions and also provide some prospects to be considered for future work.

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Section: Tribological Challenges Of M50 Steel Applicationsmentioning

confidence: 99%

Enhancing the tribological and mechanical properties of M50 steel using solid lubricants – A detailed review

Essa

Zhang

Huang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…15 This compressive residual stress has proven beneficial in retarding fatigue processes. 8,16,17 Both the M50 and case carburised M50NiL require a number of thermal treatments following quenching, including tempering and cryogenic cooling in order to control the level of retained austenite, which can otherwise compromise dimensional stability. 18 The predominant failure mechanism in ordinary bearing steels is rolling contact fatigue (RCF), 19 which describes the accumulation of damage through repetitive contact loading.…”

Section: Materials Selectionmentioning

confidence: 99%

“…Marble's reagent was used to reveal the primary carbides, a solution comprising of 5% copper sulphate to equal parts hydrochloric acid and water. Carbide populations were quantified using image analysis software, 40 with microanalysis using energy *The two aircraft grade alloys are given first, 8 followed by the most popular traditional bearing steel for comparison. 9 dispersive X-ray spectroscopy on the JEOL 5800LV scanning electron microscope (SEM).…”

Section: Bearing Design and Applicationmentioning

confidence: 99%

“… * The two aircraft grade alloys are given first, 8 followed by the most popular traditional bearing steel for comparison. 9 …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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