Effect of alternating magnetic field on microstructure evolution and mechanical properties of M50 bearing steel during tempering process

Zhu, Fuhai; Jiang, Danqing; Sun, Shujian; Wu, Han; Zhang, Zhenqiang; Wang, Jiang; Ren, Zhongming

doi:10.1016/j.jmrt.2023.08.121

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…Through conventional martensitic quenching, the surface hardness of 8Cr4Mo4V steel can attain 60-64 HRC. This process primarily hinges on the secondary hardening effect during later high-temperature tempering [13,[22][23][24], giving 8Cr4Mo4V notable strength and resistance to contact fatigue [25][26][27][28][29][30][31]. Unfortunately, bearings in aerospace applications are subjected to harsh environmental conditions, marked by extreme temperatures, elevated contact pressures and exposure to vacuum and radiation [14].…”

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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