PSI - Issue 23

Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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I. Bacaicoa et al. / Procedia Structural Integrity 23 (2019) 33–38

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Specimens with a higher Fe-content were tensile tested in a MTS E45 testing machine at a strain rate of 1.5 10 -4 s -1 . The fatigue tests were performed at 100 MPa at R=-1 and 50 Hz and the fracture surfaces were subsequently analyzed by scanning electron microscopy and micro-computed-tomography with the aim of classifying the different fracture damage scenarios and characterizing the fatigue behavior.

Fig. 1. Volume element with agglomerated ß -Al 5 FeSi phases forming a cluster.

A high resolution lab X-ray tomograph [ZEISS Xradia Versa 520] was used for the three-dimensional measurements of the casting defects at 70 KV and a power of 7 W wih the 0.4X objective, achieving a resolution of 3.84 µ m/voxel for the pores and 2.89 3.84 µ m/voxel for the Fe-rich inclusions. The segmentation of the shrinkage pores and Fe rich inclusions was carried put with the rendering software Avizo [FEI]. A grey-scale tool was used for the segmentation of the shrinkage pores after applying a non-local means filter, whereas the Fe-rich inclusions were manually segmented.

Fig. 2. 3D reconstruction of the typical shrinkage pores in the studied alloy.