Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Influence of Shot Peening on Cavitation Erosion Resistance of Gray Cast Iron

쇼트피닝이 회주철의 캐비테이션 침식 저항성에 미치는 영향

  • Park, Il-Cho (Division of Cadet Training, Mokpo Maritime University)
  • 박일초 (목포해양대학교 승선실습과정부)
  • Received : 2021.06.15
  • Accepted : 2021.06.17
  • Published : 2021.06.30
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Abstract

In this study, optimal shot peening process conditions were investigated for improving the cavitation erosion resistance of gray cast iron under a marine environment. Shot peening was performed with variables of injection pressure and injection time. The durability was then evaluated through cavitation erosion test which was conducted according to the modified ASTM G-32 standard. The tendency of cavitation erosion damage according to shot peening process condition was investigated through weight loss rate, surface and cross-sectional analysis of the specimen before and after the test. As a result, the shot peening process condition that could minimize cavitation erosion was when the injection pressure was the lowest and when the injection time was the shortest. This was because the flake graphite exposed on the gray cast iron surface could be easily removed under such condition. Therefore, the notch effect can be prevented by surface modification. In addition, the cavitation erosion damage mechanism of gray cast iron was discussed in detail.

Keywords

Acknowledgement

본 논문은 2020년도 목포해양대학교 교내연구비의 지원을 받아 수행한 연구결과임.

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