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부식환경하에서 쇼트피닝 가공에 의한 Al 7075-T6의 피로특성
이국진(Kookjin Lee),이동선(Dongsun Lee),정성균(Seongkun Cheong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Corrosion fatigue life of a metal is greatly affected by the surface state of the metal. The shot peening process is know to have excellent effects on the fatigue life of parts by increasing the parts' resistance to corrosion. In this paper, the improvement of durability of shot peened Al 7075- T6 is studied under corrosive environment. Specimens were submerged in 3.5% NaCl from one week to two years before fatigue testing. It is attempted to estimate the peening layer in shot peened Al 7075 by ultrasonic velocity, such as leaky surface acoustic wave(LSAW). The fractured surface is examined by scanning electron microscope (SEM). The experimental results show that the corrosion fatigue resistance of Al 7075-T6 is greatly improved by shot peening process.