Effects of Shot Peening on the Corrosion Fatigue Life of Al 7075-T6

Author:  Cheong, Nam, Lee, Kim
Source:  Conf Proc: ICSP-9 (pg 338-343)
Doc ID:  2005107
Year of Publication:  2005
Abstract:  
ABSTRACT The effect of shot peening on fatigue life of Al 7075-T6 under corrosive environment is investigated. Impeller type shot peening machine and spherically conditioned cut wire shot were used for the process. Before fatigue testing, specimens were submerged in 3.5% NaCl solution from one week to one year under room temperature. Rotating beam fatigue test machine was used to evaluate the fatigue life. Experimental results show that shot peening has superior effectiveness to increase the corrosion fatigue life of Al 7075-T6. In case of shot peened specimen, only 18% of the fatigue limit was reduced even after submerging for one year. In contrast, 42% of the fatigue limit was reduced in case of un-peened specimen.