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Open AccessArticle

A Study on the Improvement of the Fatigue Life of Bearings by Ultrasonic Nanocrystal Surface Modification Technology

1
Graduate School, Department of Mechanical Engineering, Sun Moon University, Chungcheongnam-do 31460, Korea
2
Department of Mechanical Engineering, Sun Moon University, Chungcheongnam-do 31460, Korea
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1114; https://doi.org/10.3390/met9101114
Received: 5 September 2019 / Revised: 10 October 2019 / Accepted: 15 October 2019 / Published: 19 October 2019
(This article belongs to the Special Issue Advanced Surface Modification Technologies)
In this study, the effects of ultrasonic nanocrystal surface modification (UNSM) technology on the fatigue life of needle roller bearings were investigated. The fatigue life of the untreated and UNSM-treated needle roller bearings was evaluated using a roller fatigue tester at various contact stress levels, under oil lubrication conditions. It was found that the fatigue life of the UNSM-treated needle roller bearing was extended by approximately 34.3% in comparison with the untreated one. The results of the surface roughness and surface hardness of the needle roller bearings before and after UNSM technology were compared and discussed in order to understand the role of UNSM technology in improving fatigue life. It was found that the application of UNSM technology to the needle roller bearings can improve their fatigue life by reducing the friction coefficient and increasing the wear resistance, which may be attributed to the reduction in surface roughness from 0.50 µm to 0.15 µm and also the increase in surface hardness from 58 HRC to 62 HRC. View Full-Text
Keywords: needle roller bearing; surface roughness; surface hardness; rolling contact fatigue; ultrasonic nanocrystal surface modification needle roller bearing; surface roughness; surface hardness; rolling contact fatigue; ultrasonic nanocrystal surface modification
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MDPI and ACS Style

Darisuren, S.; Park, J.-H.; Pyun, Y.-S.; Amanov, A. A Study on the Improvement of the Fatigue Life of Bearings by Ultrasonic Nanocrystal Surface Modification Technology. Metals 2019, 9, 1114.

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