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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Vacuum Support on the Fatigue Life of AlSi9Cu3(Fe) Aluminum Alloy Die Castings
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Influence of Vacuum Support on the Fatigue Life of AlSi9Cu3(Fe) Aluminum Alloy Die Castings

机译：真空支持对Alsi9Cu3（Fe）铝合金压铸疲劳寿命的影响

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摘要

High-pressure die casting (HPDC) is a near-net-shape process that produces high quality castings with narrow dimensional tolerances. The HPDC castings are being increasingly used due to good flexibility and high productivity, especially for the automotive industry. Depending on the location of the cast components, there are ever more complex geometries and increasing strength requirements that can be achieved by the application of vacuum-assisted die casting (VPDC). The most specific features of the HPDC process are the rapid mold filling, high cooling rate and intensification pressure. As a consequence of these highlighted features, the process generally leads to the formation of casting defects, such as gas porosity, shrinkage, and entrapped oxide films. However, the VPDC casting process is capable to significantly reduce the amount of these casting defects. The aim of this work is to compare the HPDC and VPDC castings' high-cycle fatigue behavior and to describe how the casting defects affect the fatigue failure. Before the fatigue tests, the samples were investigated with non-destructive (NDT) materials testing methods such as hydrostatic weighing, x-ray, and computer tomography (CT) to characterize the gas pore and shrinkage pore populations of the material. The AlSi9Cu3(Fe) aluminum alloy castings have been subjected to constant amplitude load by uniaxial fatigue tests in the high-cycle fatigue region with a stress asymmetry ratios ofR = -1 andR = 0.1. The resulting fracture surfaces are analyzed through light optical microscopy (LOM) and scanning electron microscopy (SEM). VPDC increased the number of cycles to fracture and decreased the scatter at the given load levels compared to conventional HPDC casting. Moreover, VPDC significantly decreased the porosity size and volume, and the occurrence of oxide flakes is also decreased, resulting in the improvement in the number of cycle to failure.
机译：高压压铸件（HPDC）是近净形的过程，可产生具有窄尺寸公差的高质量铸件。由于良好的灵活性和高生产率，特别是对于汽车行业，越来越多地使用HPDC铸件。根据铸造部件的位置，通过应用真空辅助压铸（VPDC）可以实现更复杂的几何形状和增加的强度要求。 HPDC工艺的最具体的特点是快速填充，高冷却速度和强化压力。由于这些突出的特征，该方法通常导致形成铸造缺陷，例如气体孔隙率，收缩和夹带氧化膜。然而，VPDC铸造过程能够显着减少这些铸造缺陷的量。这项工作的目的是比较HPDC和VPDC铸件的高周期疲劳行为，并描述铸造缺陷如何影响疲劳失效。在疲劳试验之前，用非破坏性（NDT）材料测试方法研究了样品，例如静水压称重，X射线和计算机断层扫描（CT），以表征材料的气体孔和收缩孔口。通过高循环疲劳区域中的高轴疲劳测试，Alsi9Cu3（Fe）铝合金铸件已经通过R = -1和R = 0.1的应力不对称区域进行恒定幅度载荷。通过光学显微镜（LOM）和扫描电子显微镜（SEM）分析所得到的断裂表面。与常规HPDC铸件相比，VPDC增加了裂缝的循环次数并降低给定负载水平的散射。此外，VPDC显着降低了孔隙率和体积，并且氧化薄片的发生也降低，导致循环次数的改善。

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