Abstract
A study has been made of the spheroidization of pearlite in eutectoid steel at 700° C under conditions of lengthy annealing, cold working at room temperature followed by annealing, hot torsion, and hot fatigue. The results show that hot torsion accelerates spheroidization by a factor of ∼ 104 compared with annealing but that acceleration by a factor of ∼ 100 is obtained both with cold work followed by annealing and with hot fatigue. It is suggested that the acceleration results from enhanced diffusion of iron in the ferrite due to the introduction of large-angle sub-boundaries by dynamic recovery.
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