Effect of Hot Rolling Finishing Temperature on the Microstructure and Roping Morphology of Al-Mg-Si Alloy

MENG Xiangchen; YU Junpeng; LI Yancheng; MA Huilin; XU Zhiyuan; XU Yangfan

doi:10.3969/j.issn.1674-6457.2026.03.005

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (3) : 46-52. DOI: 10.3969/j.issn.1674-6457.2026.03.005

Light Alloy Forming

Effect of Hot Rolling Finishing Temperature on the Microstructure and Roping Morphology of Al-Mg-Si Alloy

MENG Xiangchen^1,*, YU Junpeng¹, LI Yancheng¹, MA Huilin^1,2, XU Zhiyuan^1,3, XU Yangfan¹

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Abstract

The work aims to address the issue of Roping defects on the surface of parts formed by stamping rolled sheets of T4P-state Al-Mg-Si alloys, and to eliminate such roping defects by optimizing the finishing temperature of hot rolling. The effect of hot rolling finishing temperature on the microstructure, texture evolution, and Roping morphology of Al-Mg-Si alloy sheets was comprehensively investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and surface topography analysis. When the hot rolling finishing temperature was maintained at 400 ℃, abundant micron-scale Mg₂Si phases precipitated in the hot-rolled sheet microstructure. These precipitates served as heterogeneous nucleation sites during subsequent recrystallization of solution treatment, resulting in a refined grain structure in the T4P state sheet. However, a higher hot rolling finishing temperature promoted a higher volume fraction of recrystallization textures in the hot-rolled sheet microstructure, with the volume fraction of Cube texture ({001}<100>) reaching 11.57%. This texture was inherited through genetic effects, increasing the volume fraction of Cube texture to 17.47% in the T4P state sheet microstructure and exacerbating surface Roping morphology. When the hot rolling finishing temperature was reduced to 300 ℃, the precipitation of Mg₂Si phases in the hot-rolled sheet microstructure significantly decreased. The lower hot rolling finishing temperature significantly inhibited recrystallization in the hot-rolled sheet microstructure, decreasing the genetic inheritance of Cube texture. Consequently, the volume fraction of Cube texture in the T4P state sheet decreased to 6.84%, and surface Roping morphology was improved. Reducing the hot rolling finishing temperature from 400 ℃ to 300 ℃ effectively decreases the Cube texture volume fraction in the T4P state sheet, thereby improving the Roping defect on the surface of the alloy sheet.

Key words

Al-Mg-Si alloy / hot rolling / recrystallization / texture / Roping

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MENG Xiangchen, YU Junpeng, LI Yancheng, MA Huilin, XU Zhiyuan, XU Yangfan. Effect of Hot Rolling Finishing Temperature on the Microstructure and Roping Morphology of Al-Mg-Si Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(3): 46-52 https://doi.org/10.3969/j.issn.1674-6457.2026.03.005

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