Effect of Roller Levelling on Tensile Properties of Aluminum Sheets
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Mechanical Model
2.3. Material Model
3. Results
Tensile Test Results
4. Discussion
4.1. Analysis of Tensile Test Results
4.2. Comparison of the New Mechanical Model with Experimental Results
5. Conclusions
- The tested roller levelling process caused an average increase in yield strength of 14% for AlMg3 and 18% for AlMg4.5, while tensile strength changed by less than 1%.
- The theoretical model developed on the basis of levelling parameters and initial sheet properties correctly describes the increase in yield strength due to roller levelling calculated from the inhomogeneous deformation of the sheet, and this was clearly confirmed by comparison with experimental results.
- The value of the hardening exponent decreased by approximately 15% for both sheets, while the average normal anisotropy did not change.
- With regard to the change in the property ratios of levelled and not levelled samples, it was found that a higher yield strength is associated with a lower increase ratio, i.e., the samples hardened during production will suffer less increase in yield strength than the annealed versions.
- This phenomenon is inversely related to the uniform elongation, the elongation at break and the hardening exponent. The greater the elongation and hardening exponent of the not levelled sample, the higher their relative decrease.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Alloys | Mg (wt.%) | Fe (wt.%) | Si (wt.%) | Mn (wt.%) |
---|---|---|---|---|
AlMg3 | 3.30 | 0.11 | 0.05 | 0.33 |
AlMg4.5 | 4.69 | 0.11 | 0.09 | 0.25 |
Cold rolling | CR 15% | A 320 °C/2 h | CR 5% | AlMg3/1 | ||
CR 15% | A 320 °C/2 h | CR 5% | SR 270 °C/2 h | AlMg3/2 | ||
CR 20% | A 320 °C/2 h | AlMg3/3 | ||||
A 320 °C/2 h | CR 20% | A 320 °C/2 h | AlMg3/4 |
AlMg3 | σy, MPa | σUTS, MPa | εu, % | εTS, % | n | r |
---|---|---|---|---|---|---|
AVE (WL) | 122.26 | 231.94 | 18.00 | 23.09 | 0.28 | 0.75 |
AVE (RL) | 139.34 | 234.52 | 17.43 | 22.30 | 0.24 | 0.75 |
RL/WL | 1.14 | 1.01 | 0.97 | 0.96 | 0.85 | 0.99 |
AlMg4.5 | ||||||
AVE (WL) | 111.67 | 269.67 | 22.52 | 25.88 | 0.360 | 0.818 |
AVE (RL) | 132.11 | 271.33 | 21.44 | 24.06 | 0.309 | 0.831 |
RL/WL | 1.18 | 1.01 | 0.95 | 0.93 | 0.86 | 1.02 |
S = 2.16 mm | RL σy | σy-Calc | Error % |
---|---|---|---|
AlMg3/1 RD | 187 | 189.24 | 1.20 |
AlMg3/2 RD | 150 | 140.37 | −6.42 |
AlMg3/3 RD | 115 | 112.46 | −2.21 |
AlMg3/4 RD | 114 | 107.60 | −5.61 |
AlMg4.5-RD | 128 | 131.41 | 2.66 |
AlMg4.5-DD | 132 | 128.58 | −2.59 |
AlMg4.5-TD | 130 | 125.74 | −3.28 |
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Harangozó, D.; Czinege, I. Effect of Roller Levelling on Tensile Properties of Aluminum Sheets. Materials 2023, 16, 3001. https://doi.org/10.3390/ma16083001
Harangozó D, Czinege I. Effect of Roller Levelling on Tensile Properties of Aluminum Sheets. Materials. 2023; 16(8):3001. https://doi.org/10.3390/ma16083001
Chicago/Turabian StyleHarangozó, Dóra, and Imre Czinege. 2023. "Effect of Roller Levelling on Tensile Properties of Aluminum Sheets" Materials 16, no. 8: 3001. https://doi.org/10.3390/ma16083001