Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Effect of Surface Treatment on Fatigue Strength of SCM440H

SCM440H 금형강의 표면 처리에 따른 피로 특성 연구

  • 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.)
  • Received : 2013.06.02
  • Accepted : 2013.06.27
  • Published : 2013.08.01
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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.

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References

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