Constitutive Modeling of the Hot Deformation Behavior in 6082 Aluminum Alloy
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Constitutive Modeling of the Hot Deformation Behavior in 6082 Aluminum Alloy Kuo Li, Qinglin Pan, Ruishi Li, Shuhui Liu, Zhiqi Huang, and Xin He (Submitted June 7, 2018; in revised form December 14, 2018; published online January 22, 2019) The hot compressive tests of 6082 aluminum alloy were conducted on a Gleeble-3500 thermomechanical simulator at temperature ranges of 380-530 °C and strain rate range of 0.01-10 s21. The constitutive analysis and microstructural evolution of the alloy were investigated. It was indicated that the peak stress increased with increasing strain rate and decreasing temperature. Dynamic recovery and dynamic recrystallization lead to the softening behavior of the alloy. In order to characterize the flow behavior of this alloy, some models were established based on the experimental data including the phenomenological Arrhenius-type model, the physically based Estrin and Mecking (EM) model for work hardening and dynamic recovery, and the EM model, which was combined with the Avrami equation for dynamic recrystallization. An artificial neural network model was also established to predict the flow stress. The results indicate that the Arrhenius-type model is more simple and more efficient than the EM + Avrami model. Moreover, the well-trained ANN model has the best predicting performance. Keywords
6082 aluminum alloy, artificial neural network, Arrhenius-type model, Avrami equation, constitutive analysis, Estrin–Mecking equation
1. Introduction Aluminum alloys have been widely used in the field of transportation in recent years, because they are lighter than steel with the same mechanical performance and can absorb more energy than steel in a collision test (Ref 1). 6XXX aluminum alloys own excellent extrusion molding performance and corrosion resistance, though the strength cannot match with the 2XXX and 7XXX aluminum alloys (Ref 2-4). 6082 aluminum alloy has been widely used in the automobile industry because of its excellent formability and corrosion resistance. With the development of lightweight automobiles, it is increasingly difficult to shape complex parts, which poses a great challenge to the processing technology of the 6082 aluminum alloy (Ref 5). With the continuous innovation and development of computer and software, finite element simulation technology plays a vital role in the study of materials processing technology due to its powerful analysis and simulation ability (Ref 6). In finite element simulation, an accurate reasonable material constitutive model is necessary, whereas current commercial simulation software programs such as DEFORM and QFORM do not have the complete material data for the 6082 aluminum alloy. Therefore, a systematic and comprehensive study of various constitutive relationships in the
Kuo Li, Qinglin Pan, Shuhui Liu, and Xin He, School of Material Science and Engineering, Central South University, Changsha 410083, China; Ruishi Li, Suntown Technology Group Co., Ltd., Changsha 410200, China; and Zhiqi Huang, Guangdong Fenglu A
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