1354 各種アルミニウム合金ダイカストの超音波疲労特性(S22-3 非鉄合金・試験装置,S22 ギガサイクル疲労)

概要

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Super long life fatigue properties of Al-Si-Cu die casting alloys (D10FM-T6 with small amount of R.E.) and Al-Si-Mg die casting alloys (AC4C-T6) were investigated by using ultrasonic fatigue tests at room temperature. In the case of D10FM-T6 with small amount of R.E., the fatigue properties were studied considering the location of casting defect that was the origin of fatigue crack. The main results obtained are as follows, (1) For D10FM-T6 with small amount of R.E., the S-N curve is different from the location of casting defect. When casting defect is contacting or on the surface of test specimen, the S-N curves broke in the regime around 10^7 cycles. When casting defect is inside of test specimen, fatigue strength decreased along with the increase of the number of cycles. (2) For AC4C-T6, the fatigue fractures were caused by shear type crack and fatigue strength decreased along with the increase of the number of cycles.
2005-09-18