In the present study the effect of an austempering heat treatment on the quasi-static and fatigue behaviour of ductile iron was studied. 40 mm Y-blocks were used for the investigations with the risers cut off before heat treatment. Testing specimens with as-cast (pearlitic) and austempered microstructure were taken out from two different positions of the Y-blocks. The austempering heat treatment increases tensile strength, yield strength, elongation at fracture and fatigue strength. Tensile and fatigue tests verify that the mechanical properties are lower close to the riser. This is explained by the varying microstructure in the Y-blocks.

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