G0301601 Very high cycle fatigue property on AC4CH casting aluminum alloy

Abstract

In order to investigate very high cycle fatigue property of AC4CH-T6 casting aluminum alloy, axial loading fatigue tests were performed. Because it was known that the fatigue property of casting aluminum alloy was affected by the influence of casting defects inside the material, the defect inspection of the specimen was conducted by computed tomography with the industrial X-ray CT scanner after making them. As a result, it was expected that this material showed an excellent fatigue property, because there was no large defect in all of the specimens. However, this material had poor fatigue property contrary to expectation. And then, some large size facet of α-dendrite structure weres observed in the crack initiation site.