Abstract
Influence of shot peening (SP) on the fatigue reliability of HIP-treated aluminum alloy casting was investigated with the aim of improving the fatigue strength. The main results were as follows. The fatigue strength of HIP-treated aluminum alloy casting was improved by SP treatment. A plane facet induced by slip was observed at the origin of the fatigue crack in SP-treated casting. Improvement of the fatigue strength resulted from the control of crack initiation due to surface hardening. Fatigue life characteristics were not affected by surface roughness induced by SP treatment. Fatigue strength of aluminum alloy casting was improved by control of material manufacturing process.
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