抄録
A report is presented in this paper of the investigation made of the behavior of carbon steel (S10C, S20C, S30C and S40C) in plastic range by ultrasonic attenuation. The relation of attenuation to plastic deformation and annealing temperatures was observed.
The interpretation of the results is based on the assumption that the change in attenuation is caused by the motion of the movable dislocation line, that the internal stress is related to the changes in the magnetomechanical losses, and that these are associated with the micro-eddy current induced by the vibration of the magnetic domain walls.
The conclusions reached from the results are as follows:
(1) The internal stress reaches its maximum at 3∼4% plastic deformation.
(2) In strain aging, the dislocation is perfectly stabilized by annealing nearly at 300°C.
(3) It seems that plastically deformed materials are perfectly recovered by annealing nearly at 600°C.
