A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting
Abstract
:1. Introduction
2. Materials and Methods
Parameters | Values |
---|---|
TL (K) | 920 |
TS (K) | 856 |
C (J/(kg k)) | Figure 2a |
ρ (kg/m3) | 2352 |
μe (Pa s) | 0.001 × 1010fs |
K (W/(m k)) | Figure 2b |
3. Results and Discussions
3.1. Temperature Field under Different Conditions
3.2. Optical Observations and Element Distribution
3.3. Mechanism of Different Segregation Defects
3.4. Mechanical Properties
3.5. Hardness and Electrical Conductivity
4. Conclusions
- (1)
- AA6022 aluminum alloys have successfully been produced into 20 mm thick thin slab at about 0.4 m/min with proper design of nozzle and graphite side dam, which can significantly improve the edge cooling effect, reduce the probability of cold laps defect, and the macro centerline segregation band.
- (2)
- The novel FC-TRC method will change the crystallization front depth from sharp to smooth, increase the uniformity of the alloy elements in the thickness direction of the thin slab. This greatly reduces the tendency of alloying elements to concentrate at the center region of the strip which resulted in an increasing in ductility properties.
- (3)
- After further cold rolling and the heat treatment process, the ultimate yield strength and tensile strengths of strips are 121 MPa, 236 MPa, 129 MPa, 258 MPa, 133 MPa, and 256 MPa, with elongation of about 23%, 24%, and 29%, respectively. Compared to the traditional TRC method, the elongation of FC-TRC increased greatly but the tensile strength was nearly the same.
- (4)
- The effect of the forced cooling method can significantly improve the solid solution of alloy elements, increase the hardness and decrease the conductivity. The average hardness increased from 52.45 HV of traditional TRC to 60.35 HV of FC-TRC, and the average conductivity decreased from 50.27 HV of traditional TRC to 49.95 HV of FC-TRC.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Li, Y.; He, C.; Li, J.; Wang, Z.; Wu, D.; Xu, G. A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting. Materials 2020, 13, 1713. https://doi.org/10.3390/ma13071713
Li Y, He C, Li J, Wang Z, Wu D, Xu G. A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting. Materials. 2020; 13(7):1713. https://doi.org/10.3390/ma13071713
Chicago/Turabian StyleLi, Yong, Chen He, Jiadong Li, Zhaodong Wang, Di Wu, and Guangming Xu. 2020. "A Novel Approach to Improve the Microstructure and Mechanical Properties of Al–Mg–Si Aluminum Alloys during Twin-Roll Casting" Materials 13, no. 7: 1713. https://doi.org/10.3390/ma13071713