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首页> 外文期刊>ISIJ international >Effect of Micro-porosities on Fatigue Behavior in Aluminum Die Castings by 3D X-ray Tomography Inspection
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Effect of Micro-porosities on Fatigue Behavior in Aluminum Die Castings by 3D X-ray Tomography Inspection

机译：通过3D X射线断层扫描检查微孔对铝压铸件疲劳行为的影响

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摘要

In this investigation, porosities in fatigue specimens obtained from practical ADC12 high pressure die castings were detected and reconstructed with high resolution X-ray computed tomography technology. Three dimensional (3D) characterizations of the porosities were analyzed. The high cycle fatigue tests were carried out at five stress amplitudes on seven groups of the specimens with different porosity contents. The Weibull analysis suggested less scatter of the fatigue life at larger stress condition. With the SEM observation on the fatigue fractured surfaces, the porosities initializing the fatigue cracks were identified. A pore-fatigue life prediction equation was deduced with the pore characteristics from the fracture surface and 3D X-ray tomography inspection. With 3D reconstruction of tomography data and FEA method, the simulation of the stress distribution around the actual 3D pores were carried out and analyzed further.
机译：在这项研究中，从高分辨率ADC X射线计算机断层扫描技术检测并重建了从实际ADC12高压压铸件获得的疲劳试样中的孔隙。分析了孔隙的三维（3D）特征。在七组孔隙率不同的试样上以五个应力幅度进行了高周疲劳试验。 Weibull分析表明，在较大的应力条件下，疲劳寿命的分散较小。通过SEM观察疲劳断裂面，确认了引起疲劳裂纹的孔隙率。利用断裂表面的孔隙特征和3D X射线断层扫描检查推导了孔隙疲劳寿命预测方程。利用断层扫描数据的3D重建和FEA方法，对实际3D孔周围的应力分布进行了模拟，并进行了进一步分析。

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