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Detection and influence of shrinkage pores and non-metallic inclusions on fatigue life of cast aluminum alloys

: Tijani, Yakub; Heinrietz, Andre; Stets, W.; Voigt, P.

Balle, F. ; The Minerals, Metals and Materials Society -TMS-, Warrendale/Pa.:
TMS 2012, 141st Annual Meeting and Exhibition. Supplemental Proceedings. Vol.2: Materials Properties, Charaterization and Modeling : Symposium "Ultrasonic Fatigue of Advanced Materials and Systems", The meeting was held on March 11- 12, 2012 in Orlando, Florida
Chichester: Wiley, 2012
ISBN: 978-1-1182-9609-7
The Minerals, Metals and Materials Society (TMS Annual Meeting and Exhibition) <141, 2012, Orlando/Fla.>
Symposium "Ultrasonic Fatigue of Advanced Materials and Systems" <2012, Orlando/Fla.>
Conference Paper
Fraunhofer LBF ()
nonmetallic inclusion; fatigue life; alluminium alloys

In this work, test bars of cast aluminum alloys EN AC-AlSi8Cu3 and EN AC-AlSi7Mg0.3 were produced with a defined amount of shrinkage pores and oxides. For this purpose a permanent mold with heating and cooling devices for the generation of pores was constructed. The oxides were produced by a contamination of the melt. The specimens and their corresponding defect distributions were examined and quantified by X-Ray computer tomography (CT) and quantitative metallography respectively. A special test algorithm for the simultaneous image analysis of pores and oxides was developed. The defective samples were examined by fatigue testing. The presence of shrinkage pores causes a lowering of the fatigue strength. The results show that pore volume is not sufficient to characterize the influence of shrinkage pores on fatigue life. A parametric model for the calculation of fatigue life based on the pore parameters obtained from CT scans was implemented. The model accounts for the c ombined impact of pore location, size and shape on fatigue life reduction.