Abstract
The energy absorbed in the carbon steel forgings due to impact bending decreases with the fall of temperature. In this paper, the destructive behaviors of carbon steel forgings were studied in the temperature ranging from 600°C to the liquid nitrogen temperature.
With the falling temperature the fracture stress rose, the time required for the break was shortened, and the absorbed energy decreased gradually. This is the reason why precise transition temperature is not determinable by measuring the absorbed energy. According to the author's finding as the result of the test on the destructive behavior, the fracture stress fell suddenly at specified temperature, considered as the cross point of the fracture stress and the yield stress in the stress-temperature relationships.
This temperature is the transition temperature of the impact bending at the loaded stress rate.
The relation between this transition temperature and the stress rate was in good accord with A. N. Stroh's finding.
