obtained (Table 1). As an example, Figure 2 shows the microstructures obtained for the modulus 0.26 in. (0.65 cm) and 0.5 in. (1.28 cm). It was observed in the study that the lower thermal modulus is associated with a higher amount of lower ausferrite. This results in higher strength for the lower thermal moduli, but lower ductility. The experimental model has been validated with dif- ferent geometries in a defined range of thermal moduli (0.16 in. and 0.6 in. [0.4 cm and 1.5 cm]) and for specific range of chemical composition (3- 5%Ni, 0-0.2%Mo, 0.1-1%Cu by weight). ■


Fig. 2. Shown are the microstructures for the 0.26 in. (0.65 cm) section (top) and 0.5 in. (1.28 cm) section (bottom).


Tis article is based on paper 15-010 that was presented at the 2015 AFS Metalcasting Congress.


44 | METAL CASTING DESIGN & PURCHASING | Sept/Oct 2015


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