PSI - Issue 51

Lucia Pastierovičová et al. / Procedia Structural Integrity 51 (2023) 135 – 140 L. Pastierovi č ová et al. / Structural Integrity Procedia 00 (2022) 000–000

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Fig. 7. Crack initiation places (a),(b) in the alloy B (0.202 % Fe) after fatigue testing in 3.5 % NaCl solution, SEM.

4. Conclusions The research work was focused on chemical-mechanical interactions during the simultaneous application of cyclic stress and exposure to a corrosive environment of A357.0-T6 alloys with different Fe content. From the results can be concluded as follows:  As the stress amplitude decreases to 88 MPa, 78 MPa, and 68 MPa, the number of cycles to the fracture increases.  The effect of increasing Fe content on the fatigue life of the alloys was characterized by a lower number of cycles at the same loading amplitude, especially for alloys with higher Fe content.  Fractographic analysis proved the main fatigue crack initiation sites were primarily surface casting defects.  The fracture surface was characterized by transcrystalline fatigue fracture of the Al matrix with smooth areas related to the presence of large brittle Fe-rich phases or Si particles.  The final fracture regions were characterized by transcrystalline ductile fracture of the Al matrix with dimple morphology and with the local occurrence of cleavage facies (Fe-rich phase). For future analyses of the fatigue properties, it would be useful to investigate the fatigue life of AlSiMg alloys with the addition of manganese. Acknowledgements The research was supported by a project for young researchers at UNIZA, ID project 12715 (Kuchariková) and project 313011ASY4 “Strategic implementation of additive technologies to strengthen the intervention capacities of emergencies caused by the COVID-19 pandemic”. References Dolley, E.J., Lee, B., Wei, R.P., 2000. The effect of pitting corrosion on fatigue life. Fatigue and Fracture of Engineering Materials 23, 555–560. Islam, R., et al., 2018. Fatigue Properties of Overaged Cast Aluminium-7Silicon-0.3Magnesium Alloy. IOP Conference Series: Materials Science and Engineering 438, 012019. Kuchariková, L., et al., 2018. Role of Chemical Composition in Corrosion of Aluminum Alloys. Metals 8, 581. Kuchariková, L., Tillová, E., Bokuvka, O., 2016. Recycling and properties of recycled aluminium alloys used in the transportation industry. Transport Problems 11, 117-122. Laurino, A., Andrieu, E., Harouard, J., Odemer, G., Salabura, J., et al., 2014. Effect of corrosion on the fatigue life and fracture mechanisms of 6101 aluminum alloy wires for car manufacturing applications. Materials & Design 53, 236-249. Mutombo, K., du Toit, M., 2011. Corrosion fatigue behaviour of aluminium alloy 6061-T651 welded using fully automatic gas metal arc welding and ER5183 filler alloy. International Journal of Fatigue 33, 1539–1547. Tupaj, M., Orłowicz, A.W., Mróz, M., Trytek, A., 2015. Fatigue Properties of AlSi7Mg Alloy with Diversified Microstructure. Archives of Foundry Engineering 15(3), 87-90. Závodská, D., Tillová, E., Švecová, I., Chalupová, M., Kuchariková, L., Belan, J., 2019. The Effect of Iron Content on Microstructure and Porosity of Secondary AlSi7Mg0.3 Cast Alloy. Periodica Polytechnica Transportation Engineering 47(4), 283–289. Ceschini, L., Messieri, S., Morri, A., Seifeddine, S., Toschi, S., Zamani, M. 2020. Effect of Cu addition on overaging behaviour, room and high temperature tensile and fatigue properties of A357 alloy. Transactions of Nonferrous Metals Society of China 30(11), 2861-2878.