could be produced with the engineered cooling process. Mechanical properties differ based
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).
microstructure that meets the require- ments of the ADI materials. Depend- ing on the different thermal moduli of the casting, these temperatures will
change. Based on these changes, the model calculates the thickness window in which this methodology is feasible and by extension, if a given casting
on the thermal modulus and pro- cessing temperature, which result in different ADI grades 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. Tis results in higher strength for the lower thermal moduli, but lower ductility. Te experimental model has been validated with different 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 chemi- cal composition (3-5%Ni, 0-0.2%Mo, 0.1-1%Cu by weight).
Tis article is based on paper 15-010 that was presented at the 2015 AFS Metalcasting Congress.
46 | MODERN CASTING October 2015
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