Ameliorating the edge cracking behavior of Mg-Mn-Al alloy sheets prepared by multi-pass online heating rolling

Liu, Qiang; Liu, Ying; Luo, Qi; Song, Jiangfeng; Xiao, Bin; Jiang, Bin; Wu, Lei; Zhao, Hua; Shen, Qiuyan; Pan, Fusheng

doi:10.1016/j.jmapro.2022.12.017

Cited by 5 publications

(3 citation statements)

References 42 publications

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“…Figure 1b shows that according to the change in contact conditions during the NAER process, the temperature rise of the electric pulse is divided into three stages: in the guide roller contact zone 1 ⃝, the calculation formula of the Mg foil heat source is q mv = q e + q c , q e = J 2 e R m , q c = J 2 e R con /h 0 (2) where q e is the Joule heat source, R m is electrical resistivity, J e is the RMS current density in the deformation zone, q c is the electric contact heat source, R con is the contact resistance, B is the width of the roll and foil contact zone, and h 0 is the foil inlet thickness. The electric contact heat is used as the off-site heat source to calculate the temperature of the guide roller, and the heat flow is equally distributed to the guide roller and the Mg foil, q rv = q e + q c .…”

Section: Temperature Field Modelmentioning

confidence: 99%

“…Magnesium alloy rolling is very sensitive to temperature, which directly affects the quality and yield of magnesium alloy thin strip products. If the temperature is too low (<225 • C), it will lead to serious surface cracks and edge cracks [1]. If the temperature is too high, it will induce coarse grains and reduce the mechanical properties and surface quality of rolled Mg alloy foils [2].…”

Section: Introductionmentioning

confidence: 99%

“…At present, the electric pulse heating rolling process mainly includes online heating rolling and continuous electroplastic rolling. Liu et al [1], according to the characteristics of rapidity and uniformity of electric heating, significantly improved the surface quality of magnesium alloys after rolling in the online heating rolling process. By adjusting the rolling temperature [6] and the front and back tension [7], the surface quality and comprehensive mechanical properties of the strip were greatly improved [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Coupled Temperature Field Model of Difficult-to-Deform Mg Alloy Foil High-Efficiency Electro-Rolling and Experimental Study

Liu,

Yang,

Shan

et al. 2024

Metals

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In response to the challenging difficult-to-deform of magnesium foils, a high-efficiency and high-precision electro-rolling temperature field coupled model is established. This model is designed to simulate the non-annealing electric rolling (NAER) process of Mg foils under conditions of high current density, rapid temperature rise rates, and large temperature gradients. Firstly, a coupled temperature field difference model for the guide roller, roll, and Mg foil is established, based on the equipment for NAER and the electrification conditions. The Joule heat, distortion heat, and friction heat in the electric rolling process were precisely considered. Secondly, considering the peculiarity of the heat source and the heat transfer mechanism during NAER, the influence of the dynamic boundary conditions on the instantaneous temperature of the Mg foil was analyzed, which was closer to the actual situation. The experimental results show that the original model can accurately simulate the transient temperature change in Mg foils during NAER, and the error between the predicted value and the measured value is within 7.1%. According to the calculation of the model, the microstructure of completely recrystallized magnesium foil with a grain size of 4.61 μm and a texture strength of 11.3 can be obtained at an inlet temperature of 250 °C.

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Section: Temperature Field Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%