Hot Forming Mechanism of AZ31B Magnesium Alloy during Double-roller Rotary Forging

YU Zhongquan; WENG Huanqi; QIAN Yingping; HU Shengqiang; XIAO Xikang; ZHU Chundong; SHAO Wenjun

doi:10.3969/j.issn.1674-6457.2026.07.008

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (7) : 81-91. DOI: 10.3969/j.issn.1674-6457.2026.07.008

Light Alloy Forming

Hot Forming Mechanism of AZ31B Magnesium Alloy during Double-roller Rotary Forging

YU Zhongquan¹, WENG Huanqi¹, QIAN Yingping^1,*, HU Shengqiang¹, XIAO Xikang¹, ZHU Chundong^2a,3, SHAO Wenjun^2b,*

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Abstract

The work aims to reveal the deformation behavior of AZ31B magnesium alloy discs during double-roller rotary forging. By combining numerical simulation and physical experiments, a reliable finite element model for double-roller hot rotary forging of AZ31B magnesium alloy discs was established, which systematically revealed the evolution laws of overall deformation, stress, strain, temperature and velocity fields of AZ31B magnesium alloy during the hot rotary forging process. Under the action of double-roller rotary forging, the magnesium alloy discs underwent axial compression and radial expansion, with their cross-sectional profiles exhibiting an evolutionary pattern from a “mushroom shape” to an “upper bulging shape,” a “symmetric bulging shape,” and a “lower bulging shape”. The equivalent stress of the discs initially concentrated locally, then gradually spread circumferentially and radially, and ultimately covered most regions of the workpiece. Plastic deformation of the discs initiated at the upper surface contact zone, subsequently propagated axially toward the lower surface, and continuously extended radially outward. The strain field exhibited a gradient distribution, characterized by circumferential uniformity and axial-radial stratification. The temperature field of the discs sequentially evolved following a pattern: initially “high temperature at the core and low temperature on the surface”, then transitioning to “nearly identical temperatures at the upper surface and the middle part” and finally “overall homogenization”. The circumferential flow of the discs gradually transitioned from an initial “fast- inlet and slow-outlet” mode to a stable “fast-edge and slow-center” pattern, while the radial flow was consistently dominated by the outer edge region, facilitating the continuous growth of the disc diameter. A reliable finite element model is established, and the forming mechanism of AZ31B magnesium alloy discs during double-roller rotary forging is revealed.

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AZ31B magnesium alloy / double-roller rotary forging / numerical simulation / forming law

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YU Zhongquan, WENG Huanqi, QIAN Yingping, HU Shengqiang, XIAO Xikang, ZHU Chundong, SHAO Wenjun. Hot Forming Mechanism of AZ31B Magnesium Alloy during Double-roller Rotary Forging[J]. Journal of Netshape Forming Engineering. 2026, 18(7): 81-91 https://doi.org/10.3969/j.issn.1674-6457.2026.07.008

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