Acta Metallurgica Sinica (English Letters) ›› 2018, Vol. 31 ›› Issue (1): 63-70.DOI: 10.1007/s40195-017-0649-5
Special Issue: 2018镁合金专辑
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Ling Wang1,2, Yi-Quan Zhao3, Hong-Mei Chen4, Jing Zhang5, Yan-Dong Liu1(), Yi-Nong Wang3
Received:
2017-07-05
Online:
2018-01-20
Published:
2018-02-08
Ling Wang, Yi-Quan Zhao, Hong-Mei Chen, Jing Zhang, Yan-Dong Liu, Yi-Nong Wang. Improvement of Mechanical Properties of Magnesium Alloy ZK60 by Asymmetric Reduction Rolling[J]. Acta Metallurgica Sinica (English Letters), 2018, 31(1): 63-70.
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Parameters | Unit | Value |
---|---|---|
Friction coefficient | ||
Roll sheet, μ1 | 0.3 | |
Support plate sheet, μ2 | 0.1 | |
Thermal properties | ||
Thermal conductivity | N(s °C)-1 | 159 |
Thermal expansion | ||
Heat capacity | N(MM2 °C)-1 | 1.7675 |
Interface heat transfer coefficient | N(sMM2 °C)-1 | 4.5 |
Thermal expansion | 2.2 × 10-5 | |
Convection coefficient | N(sMM °C)-1 | 0.2 |
Table 1 Parameters of ARR FE simulation
Parameters | Unit | Value |
---|---|---|
Friction coefficient | ||
Roll sheet, μ1 | 0.3 | |
Support plate sheet, μ2 | 0.1 | |
Thermal properties | ||
Thermal conductivity | N(s °C)-1 | 159 |
Thermal expansion | ||
Heat capacity | N(MM2 °C)-1 | 1.7675 |
Interface heat transfer coefficient | N(sMM2 °C)-1 | 4.5 |
Thermal expansion | 2.2 × 10-5 | |
Convection coefficient | N(sMM °C)-1 | 0.2 |
Fig. 2 Effective stress distributions of the rolling sheets with different reductions obtained from FE simulation: a 25%, b 50%, c 65% of the ARR sheet; d 25%, e 50%, f 65% of the SR sheet
Fig. 5 Optical microstructures of ZK60 subjected to repeated SR and annealing at 450 °C: a the first SRed; b the first SRed and annealed; c the second SRed; d the second SRed and annealed
Fig. 6 Optical microstructures of ZK60 subjected to repeated ARR and annealing at 450 °C: a the first ARRed; b the first AARed and annealed; c the second ARRed; d the second ARRed and annealed
No. | YTS (MPa) | UTS (MPa) | Elongation (%) | Strain rate (s-1) | Processing method | References |
---|---|---|---|---|---|---|
1 | 250 | 350 | 6 | 2 × 10-3 | Twin roll cast + rolling at 350 °C | [ |
2 | 199 | 306 | 24 | 6 × 10-4 | Hot rolling at 400 °C | [ |
3 | 278 | 342 | 18 | Not support | Twin roll cast + rolling at 300 °C | [ |
4 | 200 | 360 | 25 | 5 × 10-4 | 12P ECAP at 300 °C | [ |
5 | 396 | 440 | 9 | 5 × 10-4 | 12p ECAP at 300 °C + cold rolling | [ |
6 | 150 | 310 | 30 | 3.3 × 10-3 | 4P ECAP at 250 °C | [ |
7 | 215 | 289 | 37 | 1 × 10-3 | 4P CEC at 230 °C | [ |
8 | 225 | 285 | 25 | 1 × 10-3 | 5P RU at 250 °C | [ |
9 | 135 | 285 | 34 | 1 × 10-3 | 3P RU at 250 °C + sheet extrusion at 220 °C | [ |
10 | 310 | 351 | 17 | 1 × 10-3 | DE + ECAP, 2p °C at 350 °C | [ |
11 | 269 | 315 | 12 | 1 × 10-3 | DE at 380 °C | [ |
12 | 266 | 175 | 32 | 1 × 10-3 | 4p ECAP Bc at 240 °C + 4p Bc at 180 °C | [ |
13 | 80 | 140 | 16 | 1 × 10-3 | SR at 450 °C | Present work |
14 | 200 | 264 | 27 | 1 × 10-3 | ARR at 450 °C | Present work |
Table 2 Comparisons of the room temperature properties of ZK60 alloy using different processings
No. | YTS (MPa) | UTS (MPa) | Elongation (%) | Strain rate (s-1) | Processing method | References |
---|---|---|---|---|---|---|
1 | 250 | 350 | 6 | 2 × 10-3 | Twin roll cast + rolling at 350 °C | [ |
2 | 199 | 306 | 24 | 6 × 10-4 | Hot rolling at 400 °C | [ |
3 | 278 | 342 | 18 | Not support | Twin roll cast + rolling at 300 °C | [ |
4 | 200 | 360 | 25 | 5 × 10-4 | 12P ECAP at 300 °C | [ |
5 | 396 | 440 | 9 | 5 × 10-4 | 12p ECAP at 300 °C + cold rolling | [ |
6 | 150 | 310 | 30 | 3.3 × 10-3 | 4P ECAP at 250 °C | [ |
7 | 215 | 289 | 37 | 1 × 10-3 | 4P CEC at 230 °C | [ |
8 | 225 | 285 | 25 | 1 × 10-3 | 5P RU at 250 °C | [ |
9 | 135 | 285 | 34 | 1 × 10-3 | 3P RU at 250 °C + sheet extrusion at 220 °C | [ |
10 | 310 | 351 | 17 | 1 × 10-3 | DE + ECAP, 2p °C at 350 °C | [ |
11 | 269 | 315 | 12 | 1 × 10-3 | DE at 380 °C | [ |
12 | 266 | 175 | 32 | 1 × 10-3 | 4p ECAP Bc at 240 °C + 4p Bc at 180 °C | [ |
13 | 80 | 140 | 16 | 1 × 10-3 | SR at 450 °C | Present work |
14 | 200 | 264 | 27 | 1 × 10-3 | ARR at 450 °C | Present work |
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