쇼트피닝이 회주철의 캐비테이션 침식 저항성에 미치는 영향
Influence of Shot Peening on Cavitation Erosion Resistance of Gray Cast Iron
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In this study, optimal shot peening process conditions were investigated for improving the cavitation erosionresistance of gray cast iron under a marine environment. Shot peening was performed with variables ofinjection pressure and injection time. The durability was then evaluated through cavitation erosion test whichwas conducted according to the modified ASTM G-32 standard. The tendency of cavitation erosion damageaccording to shot peening process condition was investigated through weight loss rate, surface and cross-sectionalanalysis of the specimen before and after the test. As a result, the shot peening process condition thatcould minimize cavitation erosion was when the injection pressure was the lowest and when the injection timewas the shortest. This was because the flake graphite exposed on the gray cast iron surface could be easilyremoved 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.
Abstract
In this study, optimal shot peening process conditions were investigated for improving the cavitation erosionresistance of gray cast iron under a marine environment. Shot peening was performed with variables ofinjection pressure and injection time. The durability was then evaluated through cavitation erosion test whichwas conducted according to the modified ASTM G-32 standard. The tendency of cavitation erosion damageaccording to shot peening process condition was investigated through weight loss rate, surface and cross-sectionalanalysis of the specimen before and after the test. As a result, the shot peening process condition thatcould minimize cavitation erosion was when the injection pressure was the lowest and when the injection timewas the shortest. This was because the flake graphite exposed on the gray cast iron surface could be easilyremoved 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.
참고문헌 (13)
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