Figure 9-28 shows the cooling curves obtained from several locations within a cylindrical aluminum casting. Determine the local solidification times and the SDAS at each location, then plot the tensile strength versus distance from the casting surface. Would you recommend that the casting be designed so that a large or small amount of material must be machined from the surface during finishing? Explain.

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Temperature (°C) 800 700 600 500 Center Mid-radius Surface 100 200 300 400 500 600 700 Time (s)