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http://dx.doi.org/10.7736/KSPE.2013.30.8.779

Effect of Surface Treatment on Fatigue Strength of SCM440H  

Yeom, Hyunho (Department of Mechanical Engineering, Ajou Univ.)
Lee, Moon Gu (Department of Mechanical Engineering, Ajou Univ.)
Lee, Choon Man (Department of Mechanical Design & Manufacturing, Changwon National Univ.)
Jeon, Yongho (Department of Mechanical Engineering, Ajou Univ.)
Publication Information
Journal of the Korean Society for Precision Engineering / v.30, no.8, 2013 , pp. 779-784 More about this Journal
Abstract
Increased efficiency and improved performance associated with light-weight materials were investigated in this study. Numerous studies have investigated surface treatments to improve the fatigue strength of metals. Laser heat treatment is a promising method because the power and spot size can be easily controlled, allowing a small heat affected zone (HAZ). However, changes in the material properties can result; in particular, the material can become more brittle. In this study, a combination of laser heat treatment and vibration peening was proposed to increase fatigue strength without changing the material characteristics. SCM440H was investigated experimentally, and specimens were tested using a giga-cycle ultrasonic fatigue tester. The results show that the combination of these two processes significantly increased the fatigue strength and, furthermore, different fracture types were observed after a small and large number of cycles.
Keywords
Laser Heat Treatment; Regulable Vibration Peening; Fatigue Life; Ultrasonic Fatigue Test;
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Times Cited By KSCI : 3  (Citation Analysis)
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