Al合金溶湯鍛造材の疲労特性に及ぼす溶存水素および大気湿度の影響

概要

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Rotating bending fatigue tests were carried out for a squeeze cast Al alloy AC4CH-T6, in order to investigate the effects of hydrogen in molten aluminum and ambient humidity on fatigue properties. The hydrogen contents examined were 0.22 and 0.38cc/100gAl. The humidity tested was 25% and 85% of relative humidity. Voids were increased with increase in hydrogen content. However, static strength, ductility and fatigue strength were hardly influenced by hydrogen content. On the other hand, the fatigue strength was affected by humidity, especially the crack growth was accelerated by high humidity. In all cases, most of fatigue life was occupied by the growth life of a small crack which was evaluated by the small crack growth law.
一般社団法人日本機械学会の論文
2009-08-25