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HW5 - (e the total solidification time(f the local...

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HW 5 (Due 2/18 Mon) 9-3 Suppose that liquid iron is undercooled until homogeneous nucleation occurs. Calculate (a) the critical radius of the nucleus required; and (b) the number of iron atoms in nucleus. 9-12 Find the constants B and n in Chvorinov’s rule by plotting the following data on a log-log plot: 9-20 A cooling curve is shown in Figure 9-22. Determine (a) the pouring temperature (b) the solidification temperature (c) the superheat (d) the cooling rate, just before solidification begins
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Unformatted text preview: (e) the total solidification time (f) the local solidification time (g)undercooling (h)the probable identity of the metal (i)If the cooling curve was obtained at the center of the casting sketched in the figure, determine the mold constant, assuming that n=2. 9-27 Figure 9-25 shows a cylindrical raiser attached to a casting. Compare the solidification times for each casting section and the riser and determine whether the riser will be effective....
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