Optimized Tension for AZ31B Thin Sheets Rolled with On-Line Heating Rolling

doi:10.1007/s40195-020-01141-w

Abstract

Abstract:

On-line heating rolling mill which could efficiently preheat sheet and apply tensile force on both ends of the sheet along rolling direction (RD) was used to investigate the effect of tension on mechanical behavior and shape quality of magnesium sheets. For revealing the influence mechanism, many analysis techniques including optical microscope, electron backscattered diffraction, macrotexture and transmission electron microscope were performed. The shape defect, edge wave, could be eliminated under higher tension along RD, which was attributed to more uniform distribution of microstructure and microstrain. Nevertheless, it is undesirable that the forward tensile force exceeds 3 kN in present work because the strength decreased for high recrystallization level when the tensile force is beyond this value. Furthermore, the main deformation mode was still slip during rolling process despite of accompanying twining, e.g., double twins, but more prismatic slip activated when tensile force exceeds 3 kN. The distribution of shear bands was affected by the applied tensile force that they appear as “V” shape along RD at a low forward or backward tensile force, while they appear as reticulate shape under applied tensile force of 5 kN.

Key words: Magnesium, Tension, On-line heating rollin, Mechanical behavior, Shape quality

Biquan Xiao, Jiangfeng Song, Hua Zhao, Aitao Tang, Qiang Liu, Bin Jiang, Shitao Dou, Fusheng Pan. Optimized Tension for AZ31B Thin Sheets Rolled with On-Line Heating Rolling[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(2): 227-238.

Figures/Tables 15

Fig. 1 Warm-rolling system

Table 1 Applied tension in this study

Sample designation	Forward force (kN)	Forward tension (MPa)	Backward force (kN)	Backward tension (MPa)	Tension difference (MPa)
3/6	3	29.4	6	49.8	- 20.4
1/1	1	9.8	1	8.3	1.5
3/3	3	29.4	3	24.9	4.5
5/5	5	49.0	5	41.5	7.5
6/3	6	58.8	3	24.9	33.9

Fig. 2 Optical microstructures of rolled AZ31B sheets under various tensile forces

Fig. 3 Optical microstructures of rolled AZ31B sheets under the same forward and backward force of a 1 kN, b 3 kN, c 5 kN

Fig. 4 Stress-strain curves in 0° and 90° directions at room temperature of AZ31B sheets rolled under vision tension

Table 2 Tensile properties at room temperature of AZ31 sheets rolled at various tensions

Samples	YS (MPa)		UTS (MPa)		FE (%)
Samples	0°	90°	0°	90°	0°	90°
3/6	252.6 ± 6.9	280.3 ± 6.9	286.5 ± 1.4	302.3 ± 2.1	9.3 ± 0.3	12.2 ± 1.5
1/1	233.1 ± 3.2	274.4 ± 2.5	274.1 ± 1.9	301.5 ± 2.3	12.3 ± 0.7	12.3 ± 0.9
3/3	230.3 ± 2.5	269.2 ± 3.5	269.5 ± 4.1	297.1 ± 1.9	11.3 ± 1.1	13.1 ± 1.2
5/5	216.2 ± 3.6	250.1 ± 3.2	264.5 ± 2.1	279.8 ± 1.6	11.9 ± 1.6	12.6 ± 1.5
6/3	216.9 ± 1.9	252.6 ± 2.5	263.6 ± 1.6	281.4 ± 0.7	11.5 ± 2.5	13.8 ± 1.8

Fig. 5 Shape quality of rolled sheets by a conventional rolling [17], b on-line heating rolling

Fig. 6 (0002) pole figures of rolled samples at various tensile forces: a 1 kN; b 3 kN; c 5 kN

Fig. 7 (0002) pole figures of various rolled sheets at a 1 kN, b 3 kN, c 5 kN, d recrystallization ratio, e twins distribution figures

Fig. 8 TEM images of rolled sheets at different tensile force, a, b 3 kN, c, d 5 kN

Fig. 9 a Micro-strain maps, b the statistical results of microstrain

Table 3 Pass reduction, rolling force, texture intensity and recrystallization ratio

Samples	Final thickness (mm)	Pass reduction (%)	Rolling force (kN)	Texture intensity	Recrystallization ratio (%)
1/1	0.837	16.3	185	11.5	9.0
3/3	0.838	16.2	180	10.1	10.8
5/5	0.817	18.3	151	11.9	15.2

Fig. 10 IJMA analysis of grains with various angles between their c-axis and ND, a-c 0°-30°, d-f 30°-60°, g-i 60°-90°

Fig. 11 a Kernel average misorientation (KAM) maps divided evenly into 5 areas in the ND; b-d the local misorientation average angle distribution of rolled sheets under different tension: b 1 kN, c 3 kN, d 5 kN; e the average KAM value distribution of the five area (N1-5) from (a)

Fig. 12 Distribution of Schmid factor of basal slip during tensile along 0°and 90° for rolled sheets deformed at various tensile forces: a 1 kN, b 3 kN, c 5 kN

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