Abstract
The initiation of hysteresis loop of low carbon steels in the fatigue process has been already proposed and developed by the present authors using a model based on the interaction between a dislocation and carbon atoms in the material.
As one of a series of these researches, the present study is to investigate the effect of temperature on this mechanism. The testing temperature was selected from room temperature to 100°C, and the cylindrical specimens of alminium-killed 0.1% carbon steel were tested under push-pull load with the frequency of 0.2Hz.
From the experimental results, it is shown that the initiation of the plastic strain amplitude is delayed with an increase in testing temperature in the range from 26 to 80°C. By the theoretical analysis, it is concluded that such behavior is mainly caused by the migration of carbon atoms to dislocation lines from the surrounding matrix during the fatigue process. And the calculations based on this model showed a good agreement with the trend of the experimental results.
