The Coupled Temperature Field Model of Difficult-to-Deform Mg Alloy Foil High-Efficiency Electro-Rolling and Experimental Study
Abstract
:1. Introduction
2. The NAER Coupled Temperature Field Model
2.1. Basic Assumptions and Meshing
- (1)
- The material is isotropic and homogeneous, and the material density is constant.
- (2)
- During the rolling process, the contact resistance between the guide roller and the foil is constant.
- (3)
- The current density in the guide roller contact zone and the rolling deformation zone is equal to the current density of the transition zone of Mg foils and remains unchanged along the rolling direction.
- (4)
- The rolling temperature and reduction rate do not affect the contact heat transfer coefficient, and the heat transfer coefficient between the roll and the magnesium foil is constant.
2.2. Temperature Field Model
2.3. Boundary Conditions
3. Experimental
4. Example Verification
4.1. Temperature Field Simulation of the NAER
4.2. Accuracy Evaluation of the Temperature Field Model
4.3. Microstructure
5. Conclusions
- (1)
- A coupled temperature field model of the NAER was established by considering the mill device and electrification process, and the Joule heat, deformation heat, and friction heat in the NAER process were accurately considered. The NAER temperature field model could accurately predict the peak temperature at the inlet and the outlet temperature of the multi-pass NAER of different thicknesses and different current densities. The average relative error of the prediction was about 7.1%, and the maximum relative error was about 23.0%.
- (2)
- A thorough analysis of the effect of dynamical boundary conditions on the transient temperature in the transition zone and deformation zone of the AZ31 foil in the presence of a loaded pulse current is presented, taking into account the particularities of the NAER heat source and heat exchange mechanism. Both the experimental results and the simulation results show that the temperature in the deformation zone decreases significantly with the decrease in inlet thickness. Compared with the temperature rise of deformation heat, friction heat, and Joule heat in the deformation zone, the influence of Joule heat (the material of Joule heat and electric contact heat) on the temperature rise of the deformation zone is gradually reduced to 8.9%, and the influence of Joule heat on the temperature rise of the deformation zone can be almost ignored. Therefore, the current parameters must be calculated accurately according to the NAER temperature field model to ensure the stability of temperature in the deformation zone.
- (3)
- Combining the simulation of the AZ31 foil temperature field with the experimental results of the NAER showed that the electric pulse rolling temperature field model could accurately set the rolling entrance temperature, ensuring that there would be no high-temperature melting and low-temperature brittle fracture and greatly improving the surface quality of the rolled Mg foils. The microstructural analysis showed that the wrought Mg alloy initial recrystallization at 200 °C and the texture strength of the alloy turned into a turning point at the entrance temperature of 200~320 °C. In particular, at a current density of 28.5 A/mm2, the grain size is 4.61 μm and the texture intensity is 11.3 at the inlet of the mill.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Rolling Pass | RMS Current Density Je/(A/mm2) | Inlet Thickness h0/mm | Outlet Thickness h1/mm | Rolling Force/kN |
---|---|---|---|---|
1 | 21.7 | 1.050 | 0.90 | 56.24 |
2 | 24.0 | 0.901 | 0.77 | 62.05 |
3 | 28.5 | 0.772 | 0.62 | 77.7 |
4-1 | 25.0 | 0.601 | 0.512 | 70.5 |
4-2 | 28.5 | 0.599 | 0.491 | 65.4 |
4-3 | 32.1 | 0.601 | 0.472 | 60.2 |
Mass Density ρm/kg·m−3 | Electrical Resistivity Rm/nΩ·m | Temperature Tm/°C | Specific Heat Capacity cm/J·kg−1·°C−1 | Thermal Conductivity km/W·m−1·°C−1 |
---|---|---|---|---|
1.754 × 103 | 91.405 | 25 | 1005 | 84.7 |
100 | 1032 | 90.5 | ||
200 | 1049 | 95.8 | ||
300 | 1069 | 98.4 | ||
400 | 1092 | 98.6 |
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Liu, G.; Yang, J.; Shan, T.; Li, H.; Wang, D.; Yang, L. The Coupled Temperature Field Model of Difficult-to-Deform Mg Alloy Foil High-Efficiency Electro-Rolling and Experimental Study. Metals 2024, 14, 343. https://doi.org/10.3390/met14030343
Liu G, Yang J, Shan T, Li H, Wang D, Yang L. The Coupled Temperature Field Model of Difficult-to-Deform Mg Alloy Foil High-Efficiency Electro-Rolling and Experimental Study. Metals. 2024; 14(3):343. https://doi.org/10.3390/met14030343
Chicago/Turabian StyleLiu, Gengliang, Jiaxuan Yang, Tianren Shan, Huaimei Li, Dianlong Wang, and Lipo Yang. 2024. "The Coupled Temperature Field Model of Difficult-to-Deform Mg Alloy Foil High-Efficiency Electro-Rolling and Experimental Study" Metals 14, no. 3: 343. https://doi.org/10.3390/met14030343