Abstract
Fatigue test has been performed to investigate the effect of strain aging on fatigue properties of pre-strained carbon steel (S45C) using Ono-type rotary bending fatigue testing machine. Main results summarized in this study are as follows : (1) It is considered that both of the pre-strain and annealing condition influence the fatigue limit of pre-strained specimen. (2) Both the fatigue limit and hardness are increased by annealing. (3) Under the same annealing condition, the fatigue limit of pre-strained specimen increases with increase of pre-strain. (4) The optimal heat treatment temperature for obtaining the maximum value of fatigue limit decreases with increase of pre-strain.
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