Effect of low-temperature plastic deformation on the loading surface of carbon steel at room and low temperatures

Abstract

1. Strain-hardening of the steel within the temperature range from −150 to 200°C is adequately described by a hypothesis of the isotropic-kinematic type. In this case, under the investigated loading conditions the dimensions and position of the loading surface are independent of thermal history, but are instead determined by the level of plastic strain and the current temperature value. The dependence of the loading surface radius on the amount of plastic strain is linear, while the displacement of the center is nearly exponential. 2. Temperature has a significant effect on the radius of the loading surface, while the rate of increase in the radius during deformation decreases with decreasing temperature. The temperature dependence of the displacement of the surface is slight. 3. The Bauschinger effect and anisotropy of the deformed material decrease with decreasing temperature.