Abstract
ABSTRACT Aluminum and its alloys are widely used in the aeronautics industry due to its high lightness and ductility, and it can add other elements, thus changing its characteristics. Fatigue is the major cause of failure of metal materials due to the dynamic and oscillating stresses of the finished materials. The objective of this work is to evaluate the effect of Shot Peening with coverage percentages 1blasting, 3 blasting and 10 blasting in fatigue life of aluminum alloy AA 7475-T351. Shot Peening is a cold surface treatment used to increase fatigue life of the alloy by inducing residual stresses of compression on the surface of the part. In the Shot Peening process, spherical steel grids of type S230 were used, in which the specimens were subjected to 1blasting, 3 blasting and 10 blasting coverage in two stress levels (42 Ksi and 50 Ksi). The results presented in the fatigue tests and electron scanning (SEM) showed the increase in the mechanical properties of all the samples, and those exposed to 1 blasting and 3 blasting presented better results.
Highlights
The most commonly used alloys for manufacturing structural components in the aeronautics industry are thermally treatable or Hardened by Precipitation, those of the 2XXX and 7XXX series [1]
The objective of this work is to evaluate the effect of Shot Peening with coverage percentages 1blasting, 3 blasting and 10 blasting in fatigue life of aluminum alloy AA 7475-T351
GRANATO, J.A.; PONTES, J.A..; GONCALVES, E.P., et al, revista Matéria, v.25, n.2, 2020 treatment under specific, generally solubilizing and aged conditions, they exhibit significant hardness gains. They find their main application in aircraft manufacturing, since these 7XXX series alloys are those that achieve the highest levels of mechanical strength among aluminum alloys [4]
Summary
The most commonly used alloys for manufacturing structural components in the aeronautics industry are thermally treatable or Hardened by Precipitation, those of the 2XXX and 7XXX series [1]. GRANATO, J.A.; PONTES, J.A..; GONCALVES, E.P., et al, revista Matéria, v.25, n.2, 2020 treatment under specific, generally solubilizing and aged conditions, they exhibit significant hardness gains. They find their main application in aircraft manufacturing, since these 7XXX series alloys are those that achieve the highest levels of mechanical strength among aluminum alloys [4]. The temperatures of solubilization of the 7XXX series alloys are relatively low when compared to other types of aluminum alloy. A typical solubilization temperature of an Al-Zn-Mg alloy would be about 480 °C, whereas for an Al-Mg-Si alloy would be about 560 °C [5,6]
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