Sliding wear and rolling contact fatigue behavior of M50 steel coated with atomic layer deposited lubricious oxide nanolaminates

Mohseni, H.; Mensah, Benedict A.; Scharf, Thomas

doi:10.1016/j.wear.2023.204865

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The 8Cr4Mo4V alloy, due to its outstanding mechanical properties and thermal stability, is currently widely used as the main bearings materials of aeroengines 8 . The macroscopic failure modes of aeroengine bearings typically include fatigue [9][10][11][12] , creep 13 , and wear [14][15][16] . Fatigue failure is caused by the formation and propagation of microcracks within the material under stress 12,17,18 .…”

Section: Introductionmentioning

confidence: 99%

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Cao,

Ma,

Gong

et al. 2024

Preprint

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8Cr4Mo4V, as an ideal choice for aeroengines bearing materials, involves multi-scale damage mechanisms of the fatigue crack failures. Herein, we propose a multi-scale analysis method to analyze the crack initiation and propagation damage mechanisms of 8Cr4Mo4V alloy. We find that different crystal orientations produce distinctly different damage mechanisms. The second phase doping also has different strengthening effects on the matrix following bypass and cut-through mechanisms. Meanwhile, the study of the polycrystalline model verified the micro-scale inverse Hall-Petch relation, where material strength decreases with grain refinement. Phase transitions caused by dislocations lead to stress concentration at specific grain boundaries, becoming the main inducer for the nucleation of initial voids. To address micro-to-macroscale-crossing issues, we constructed a large-scale mesoscopic molecular dynamics simulation and proposed an analytical formula to predict the relationship between average grain size and yield stress. Finally, we combine macroscopic experiments, crystallographic analyses, and atomic-scale characterization, verifying the combined action of dislocations and stacking faults leads to the failure of the material.

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Section: Introductionmentioning

confidence: 99%

Multi-scale analysis method for crack damage in 8Cr4Mo4V alloys

Cao,

Ma,

Gong

et al. 2024

Preprint

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“…In response to these challenges, there is growing interest in the development of highdose-rate ion implantation methods, which promise to offer more efficient processing solutions. To our knowledge, scant studies have addressed the effect of high dose rates on plasma immersion ion implantation for 8Cr4Mo4V bearing steel [1,9,40]. Furthermore, enhancing the friction and wear behaviors of 8Cr4Mo4V steel and boosting implantation efficiency are pressing concerns demanding more research.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dose Rate on Tribological Properties of 8Cr4Mo4V Subjected to Plasma Immersion Ion Implantation

Miao,

Niu,

Guo

et al. 2024

Processes

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The lack of service lifetime of bearings has become a bottleneck that restricts the performance of aero engines. How to solve or improve this problem is the focus of most surface engineering researchers at present. In this study, plasma immersion ion implantation was conducted; in order to enhance the ion implantation efficiency and improve the wear resistance of 8Cr4Mo4V bearing steel, the dose-rate-enhanced method was adopted during ion implantation. The surface roughness, phase constituents, elemental concentration, hardness, contact angle and wear resistance of samples after ion implantation was determined by atomic force microscopy (AFM), grazing incidence X-ray diffraction (GIXRD), elemental dispersive spectroscopy (EDS), X-ray diffraction, nanoindentation tester, universal friction and wear tester, etc. The results showed that the high-dose-rate method had a significant enhancement influence on ion implantation efficiency. At the dose rate of 2.60 × 1017 ions/cm2·h, the roughness of Ra decreases from 24.8 nm to 10.4 nm, which is decreased by 58.1% for the dose rate of 7.85 × 1017 ions/cm2·h. XRD confirmed that the implanted samples consisted of the Fe(M) and Fe2–3N phase and CrN which depends on the implantation dose rate. Meanwhile, the surface hardness was improved from 11.1 GPa to 16.9 GPa and enlarged the hardened region; more valuably, the surface state of samples via high-dose-rate implantation exhibits hydrophobicity with high roughness which is able to store debris and decrease the abrasive wear during testing; thereby, the wear resistance was greatly enhanced by high-dose-rate plasma immersion ion implantation.

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