• No observable difference in transi- tion (between the low and high cycle or plastic and elastic) fatigue life was observed.


Presentation


Microstructure, Composition and Impact Strength Varia- tions Measured in a Heavy Section As-Cast Ferritic Ductile Iron Casting (12-011)


Authors


Serge Grenier, Chantal Labrecque, Rio Tinto Iron and Titanium, Sorel-Tracy, Quebec, Canada


Background Tis work is the continua-


Fig. 4. The relationship between quality and the number of lot inspections for four different miss rates and a constant false alarm rate is shown.


lives in the high cycle regime than the lower ductility grades.


tion of heavy section casting character- ization work initiated in 2009. In this presentation, the effect of the Charpy


bar location on measured impact resis- tance was examined (Fig. 3).


Conclusions


• The low temperature impact resistance of V-notch Charpy bars was found to depend on their location in the casting. Bars extracted from the bottom of castings had significantly higher impact resistance than those taken from the upper part of the casting.


• Mapping and nodule distribution curves showed significant variations between the different regions analyzed, indicating the differences in impact resistance were related to local differences in micro- structure and chemistry,


56 | MODERN CASTING May 2012


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