Question: 1 0 . 2 3 . ( a ) Specify a quench rate necessary to ensure a hardness of at least Rockwell C 4 0

10.23.(a) Specify a quench rate necessary to ensure a hardness of at least Rockwell C40 in a 4140 steel. (b) Specify a quench rate necessary to ensure a hardness of no more than Rockwell C40 in the same alloy.

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