The fatigue strength of permanent mould and sandcast aluminium is strongly influenced by the cooling rate during casting. Slower solidification yields larger secondary dendrite arm spacing with a coarser eutectic and greater defetcs i.e. porosities and intermetallic β (FeSiAl5).The negativ effect of porosity is greater than that of the amount/size of the β-platelets. The defects affect both the crack nucleation and the propagation phases. For very large defects, the initiation phase is reduced and a large portion of the life is spent as crack propagation.The secondary dendrite arm spacing (DAS) represents a good over all indication of the fatigue strength of the material, which is proportional to (DAS)−1/2. This relationship can be used to estimate the fatigue strength at various locations in a cast aluminium component.
Microstructural Effects on the Fatigue Properties of a Cast Al7SiMg Alloy
Sae Technical Papers
SAE International Congress and Exposition ; 1984
1984-02-01
Conference paper
English
Fatigue , Molding , Casting alloys , Casting
Microstructural effects on the fatigue properties of a Cast Al 7 SiMg alloy
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