科研之友
微信
新浪微博
Facebook
分享链接
摘要
The uniaxial compression flow behaviors of 30CrMnSiA alloy structural steel under pulse current were studied. A current application scheme of “conductive block-upper and lower pressure block-conductive block” was designed, and a method of using compressed air for cooling was proposed to eliminate the effect of Joule heat. The influence laws of pulse current parameters (pulse current density, pulse duty cycle and pulse frequency) on the flow behaviors of 30CrMnSiA alloy structural steel were analyzed. The electroplastic constitutive model of 30CrMnSiA alloy structural steel with the assistance of pulse current was constructed based on the Voce work hardening model and verified by tests. The results show that the flow stress of 30CrMnSiA alloy structural steel decreases with the increase of pulse current density, pulse duty cycle and pulse frequency, and the change of pulse current density has the most significant influence on the flow stress of material. The work hardening exponent n of the material with pulse current is higher than that without pulse current, and it increases with the increase of current density and duty cycle, while the change with frequency is not obvious. The error between the flow stress values calculated by using the constructed constitutive model and the test data is within 6%, indicating that the model can effectively predict the flow behaviors of 30CrMnSiA alloy structural steel during current assisted compression forming. ? 2023 Beijing Res. Inst. of Mechanical and Elec. Technology.
- 单位
