AlSi9Cu3(Fe) aluminum alloy fatigue test specimens were produced by high pressure die casting (HPDC) and vacuum‐assisted die casting (VPDC) techniques. Non‐destructive material tests (NDT) have been performed on cast specimens by computed tomography (CT). Uniaxial fatigue tests with two stress ratios of R = −1 and R = 0.1 have been performed in the high cycle fatigue (HCF) regime, and the CT results were reassigned after the fatigue test in order to identify the origin of the failure. The aim of this paper is to establish a relationship between the CT result and fatigue failure of die cast specimens. The location and the size of the casting defect determine the specimen fatigue life. It has also been found that the fatigue life is determined not only by the size of the defect but also by its location with respect to the position of the highly stressed area. The results can be used to judge the applicability of cast parts after non‐destructive testing.

中文翻译：

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通过计算机断层扫描对AlSi9Cu3（Fe）压铸样品进行疲劳测试和无损表征

AlSi9Cu3（Fe）铝合金疲劳试验样品是通过高压压铸（HPDC）和真空辅助压铸（VPDC）技术制成的。通过计算机断层扫描（CT）对铸件进行了非破坏性材料测试（NDT）。在高循环疲劳（HCF）情况下，已经进行了两个应力比分别为R = -1和R = 0.1的单轴疲劳测试，疲劳测试后重新分配了CT结果，以识别故障的根源。本文的目的是建立CT结果与压铸试样疲劳破坏之间的关系。铸件缺陷的位置和大小决定了试样的疲劳寿命。还已经发现，疲劳寿命不仅取决于缺陷的大小，还取决于其相对于高应力区域的位置。结果可用于判断无损检测后铸件的适用性。