J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (11): 2069-2083.DOI: 10.1016/j.jmst.2018.04.005
• Orginal Article • Previous Articles Next Articles
Weitao Jia*(
), Qichi Le*(), Yan Tang, Yunpeng Ding, Fangkun Ning, Jianzhong Cui
Received:2017-11-26
Revised:2018-01-10
Accepted:2018-01-11
Online:2018-11-20
Published:2018-11-26
Contact:
Jia Weitao,Le Qichi
Weitao Jia, Qichi Le, Yan Tang, Yunpeng Ding, Fangkun Ning, Jianzhong Cui. Role of pre-vertical compression in deformation behavior of Mg alloy AZ31B during super-high reduction hot rolling process[J]. J. Mater. Sci. Technol., 2018, 34(11): 2069-2083.
Fig. 1. Metallographic structure of the experimental slab, including (a) the edge region and (b) the internal region.
Fig. 2. Sketch diagram of the sampling process.
Fig. 3. Schematic diagram of roll heating device (a) and break-down rolling route of PVCR-a (R.7) (b).
| Name | Rolling/PVC (350 °C) | Thickness (mm) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| PVC | 1st-pass | PVC | 2nd-pass | 3rd-pass | 4th-pass | Initial state | Final state | ||
| Different reductions per pass | R.1 | 8% | 18% | 29.1 | 22.0 | ||||
| R.2 | 8% | 30% | 29.2 | 18.8 | |||||
| R.3 | 8% | 50% | 29.4 | 13.5 | |||||
| R.4 | 8% | 70% | 28.9 | 8.0 | |||||
| R.5 | 8% | 80% | 28.3 | 5.2 | |||||
| Different rolling routes | R.5 | 8% | 80% | 28.3 | 5.2 | ||||
| R.6 | 8% | 35% | 43% | 48% | 29.5 | 5.2 | |||
| R.7 | 10% | 8% | 80% | 29.7 | 5.1 | ||||
| R.8 | 8% | 10% | 80% | 29.6 | 5.1 | ||||
Table 1 Rolling reductions for different break-down rolling routes of AZ31B
| Name | Rolling/PVC (350 °C) | Thickness (mm) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| PVC | 1st-pass | PVC | 2nd-pass | 3rd-pass | 4th-pass | Initial state | Final state | ||
| Different reductions per pass | R.1 | 8% | 18% | 29.1 | 22.0 | ||||
| R.2 | 8% | 30% | 29.2 | 18.8 | |||||
| R.3 | 8% | 50% | 29.4 | 13.5 | |||||
| R.4 | 8% | 70% | 28.9 | 8.0 | |||||
| R.5 | 8% | 80% | 28.3 | 5.2 | |||||
| Different rolling routes | R.5 | 8% | 80% | 28.3 | 5.2 | ||||
| R.6 | 8% | 35% | 43% | 48% | 29.5 | 5.2 | |||
| R.7 | 10% | 8% | 80% | 29.7 | 5.1 | ||||
| R.8 | 8% | 10% | 80% | 29.6 | 5.1 | ||||
Fig. 4. Initial (a) and final (b) quality of the plate edge and morphology related to the V-shaped edge crack (c) and I-shaped edge crack (d).
Fig. 5. Optical micrographs of Mg alloy AZ31B plates rolled at 350 °C with different two-pass rolling routes shown in Table 1: (a) R.1, (b) R.2, (c) R.3, (d) R.4 and (e) R.5.
Fig. 6. Macroscopic morphology of plates rolled with different rolling routes by changing the 2nd-pass reduction, including (a) R.1, (b) R.2 (c) R.3, (d) R.4 and (e) R.5 (shown in Table 1), and (f) statistics about edge-cracking data.
Fig. 7. Morphology of plates rolled with different rolling routes corresponding to R.6, R.5, R.7 and R.8 listed in Table 1.
Fig. 8. Parameters of the edge cracks related to different rolling routes.
Fig. 9. Effect of rolling routes (including R.6, R.5, R.7 and R.8) on the microstructure of the central part in the RD-ND section.
Fig. 10. Effect of PVC on the microstructure of the central part (Cen.p for short) in the RD-ND section of the rolled plates.
Fig. 11. Effect of PVC on the microstructure of the edge part (Edg.p for short) in the RD-ND section of the rolled plates.
Fig. 12. Grain size distribution maps of central part (Cen. p), including surface layer ((a) R.5, (b) R.7, and (c) R.8) and center layer ((d) R.5, (e) R.7, and (f) R.8).
Fig. 13. Grain size distribution maps of the edge part (Edg. p), including surface layer ((a) R.5, (b) R.7, and (c) R.8) and center layer ((d) R.5, (e) R.7, and (f) R.8).
 |
Table 2 Grain sizes of rolled plates and relative standard deviations.
| |
Fig. 14 shows {0002} pole figures of the edge part related to different rolling routes (including R.6, R.5, R.7 and R.8).
Fig. 15. EBSD maps of the sample with 10% PVC, including (a) twin boundary map and (b) related misorientation distribution.
Fig. 16. Schematic diagrams of (a) loading directions for favorable tensile twinning with respect to the c-axis [41], (b) {10$\bar{1}$2}<101$\bar{1}$> tensile twinning system in magnesium with 86.3° reorientation of twin grain relative to parent grain [42], and (c) the reorientation of grains during the PVC process.
Fig. 17. TEM photo-micrographs of the edge part related to different rolling routes R.5 (a, b, c), R.7 (d, e, f) and R.8 (g, h, i).
Fig. 18. Effect of rolling routes on tensile properties, including 0.2% offset yield strength (YS), ultimate tensile strength (UTS), and elongation (EL).
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