| Title |
The Prediction of Deformation Resistance of Al 6061 during Hot Deformation |
| Authors |
조상현(Sang Hyun Cho) ; 김유승(Yu Seung Kim) ; 유연철(Yeon Chul Yoo) ; 임성한(Sung Han Rhim) ; 오수익(Soo Ik Oh) |
| Abstract |
The hot deformation process of Al 6061 alloy was simulated by hot torsion test. The torsion tests were performed in the ranges of 400-550℃ and 5.0×10^(-2)∼5.0×10^0/sec to predict the deformation resistance. The flow curves showed the characteristic of dynamic recrystallization(DRX) and the dependence of the flow stress on temperature(T) and strain rate (E) was expressed by hyperbolic sine law. (ε) = 2.9x10^(-3) (sinh 0.0295σ)^(6.2) exp(-207080/RT). The ZenerHollomon parameter obtained to predict the flow curves was Z= (ε) exp(207080/RT) and peak stress was expressed as σ_p=4.1ln∼(Z/A)+29.5. The modelling σ-ε curves of Al 6061 alloy were completely agreed with experimental results over the whole strain. since the hardening caused by deformation and the softening caused by dynamic recrystallization were taken into consideration in this modelling equation. |