PSI - Issue 7

Julius N. Domfang Ngnekou et al. / Procedia Structural Integrity 7 (2017) 75–83 Julius N. Domfang Ngnekou et Al./ Structural Integrity Procedia 00 (2017) 000–000

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Figure 6: priming sites (a) P1-XY-MA (b and c) P2-XY and Z –MA (d and e): P2: XY and Z-MA-T6

Figure 7: Kitagawa type diagram for MA and MA-T6 specimens

4. Conclusions In this study, AlSi10Mg material were characterized before and after T6 using five mains scales: In order to understand the role of material parameters on fatigue resistence, the fatigue limit were quantified. This lead to the following results: • For the same defect size for non-heated material, there is no anisotropy effect due to the direction of production; • The fatigue resistance improvement is less pronounced in presence of big defects; • Litle difference between XY-MA and Z-MA is observed after T6 heat treatment; The impact of defect size have been quantify Through the Kitagawa type diagrams. It was observed that: • There is no influence of the defect type on the fatigue limit; • It exists a value of defect size beyond that the fatigue limit is controlled only by the defect size, below that size, the fatigue limit is controlled by the defect size and the microstructure.