1313 鋳造アルミニウム合金AC4CHの疲労挙動に及ぼす温度の影響(S21-1 軽金属の疲労,S21 金属材料の疲労特性と破壊機構)

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  • 1313 Effect of Test Temperature on Fatigue Behaviour in AC4CH Cast Aluminium Alloy

説明

Fully reversed axial fatigue tests were conducted on a cast aluminium alloy, AC4CH, at three different temperatures of room temperature (R.T.), 150℃ (423K) and 250℃ (523K). The fatigue strength decreased as test temperature increased. The fatigue strength characterized in terms of fatigue ratio, σ/σ_B, was similar at all temperatures, but slightly lower at 250℃ in low stress region. Cracks invariably initiated from a casting porosity at R.T., while crack initiation due to slip deformation became dominant at elevated temperatures. At 250℃, the number of cracks initiated due to slip deformation was the largest and the coalescence of the main crack and other cracks was observed most frequently in low stress region, being responsible for the lowest fatigue strength characterized in terms of fatigue ratio at this temperature.

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