Abstract
Rotating bending fatigue tests were carried out for a squeeze cast Al alloy AC4CH-T6, in order to investigate the effect of hydrogen in molten aluminum on fatigue properties. The hydrogen contents were 0.22 and 0.38cc/100gAl. Voids were increased with increase in hydrogen content. However, static strength, ductility and fatigue strength were hardly influenced by hydrogen content. Most fatigue life was occupied by the growth life of a small crack which was evaluated by the small crack growth law.
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