Lubricant Requirements for High Temperature Bearings

Shevchenko, R. P.

doi:10.4271/660072

Cited by 12 publications

(4 citation statements)

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“…Generally, bearing needs to be served under high speed and high load conditions. It has been reported [1,2] that the service temperature of ordinary bearing may reach 200 °C, while the aerospace bearing can be serviced up to 300 °C. Moreover, deterioration of bearing performance may occur during the cyclic contact loading.…”

Section: Introductionmentioning

confidence: 99%

Accelerating Cementite Precipitation during the Non-Isothermal Process by Applying Tensile Stress in GCr15 Bearing Steel

et al. 2018

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In this work, the non-isothermal process of GCr15 bearing steel after quenching and tempering (QT) under different tensile stress (0, 20, 40 MPa) was investigated by kinetic analysis and microstructural observation. The Kissinger method and differential isoconversional method were employed to assess the kinetic parameters of the microstructural evolution during the non-isothermal process with and without applied stress. It is found that the activation energy of retained austenite decomposition slightly increases from 109.4 kJ/mol to 121.5 kJ/mol with the increase of tensile stress. However, the activation energy of cementite precipitation decreases from 179.4 kJ/mol to 94.7 kJ/mol, proving that tensile stress could reduce the energy barrier of cementite precipitation. In addition, the microstructural observation based on scanning and transmission electron microscopy (SEM and TEM) shows that more cementite has formed for the specimens with the applied tensile stress, whereas there is still a large number of ε carbides existing in the specimens without stress. The results of X-ray diffraction (XRD) also verify that carbon in martensite diffuses more and participates in the formation of cementite under the applied tensile stress, which thus are in good agreement with the kinetic analysis. The mechanisms for the differences in cementite precipitation behaviors may lie in the acceleration of carbon atoms migration and the reduction of the nucleation barrier by applying tensile stress.

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Section: Introductionmentioning

confidence: 99%

Accelerating Cementite Precipitation during the Non-Isothermal Process by Applying Tensile Stress in GCr15 Bearing Steel

et al. 2018

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“…In 1951, NACA (now NASA) published their first results [2] with what was termed the "NASA spin rig" [3]. About the same time that work was being performed with the spin rig, Pratt and Whitney Aircraft began utilizing what they termed a "one-ball rig" [4], General Electric Company devised what they termed the "R-C (rolling-contact) rig" [5].…”

Section: Introductionmentioning

confidence: 99%

NASA Five-Ball Fatigue Tester—Over 20 Years of Research

Zaretsky

Parker

Anderson

1982

Rolling Contact Fatigue Testing of Bearing Steels

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“…17 Steels used in aerospace applications have the advantage of holding their hardness at elevated temperatures ranging between 120 and 320 C as shown in Figure 2. 18,19 Moreover, at high temperatures where lubrication has a marginal effect, the strength could be useful in retaining the bearing integrity. 20 Hardness below 58 HRC is a main reason to form raceways' grooves.…”

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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Lubricant Requirements for High Temperature Bearings

Cited by 12 publications

References 0 publications

Accelerating Cementite Precipitation during the Non-Isothermal Process by Applying Tensile Stress in GCr15 Bearing Steel

Accelerating Cementite Precipitation during the Non-Isothermal Process by Applying Tensile Stress in GCr15 Bearing Steel

NASA Five-Ball Fatigue Tester—Over 20 Years of Research

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

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