(a) Determine the ideal critical diameter, D1, of an unalloyed 0.65 percent C steel with an austenitic grain size 7.
(b) What is the hardness of this steel, when it has (1) a 100 percent martensitic structure, and (2) a 50 percent martensitic structure? Give your answer in Rockwell?C units (HRC).
(c) At what distance along a Jominy bar should one find the HRC of the 50 percent martensitic structure?
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