Question: A part produced from a 4320 steel has a hardness of HRC 35 at a critical location after quenching. Determine (a) The cooling rate at

A part produced from a 4320 steel has a hardness of HRC 35 at a critical location after quenching. Determine
(a) The cooling rate at that location, and
(b) The microstructure and hardness that would be obtained if the part were made from a 1080 steel.

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