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<p>In the range of 360 ~ 420 ℃, the effect of billet temperature on the deformation heat and forming quality of magnesium alloy wheels was analyzed by constructing the numerical model of backward extrusion. It is found that with the increase of billet temperature, the tonnage required for wheel-forming decreases, the deformation heat decreases, and the effective stress decreases and tends to be uniform. However, when the billet temperature is too high (420 ℃), the deformation heat makes the billet temperature exceed the melting point of the second phase, which leads to the microstructure in the shear zone of the wheel easily over-burning. Billet temperature has little effect on the dynamic recrystallization (DRX) volume fraction of the wheel. However, the forming time and the effective strain are the same, and the grain size of the wheel grows with higher temperature. The cracking tendency of the rim on the wheel decreases with the increase of billet temperature. The high temperature reduces the effective stress at the upper rim, indicating that the maximum tensile stress at the upper rim is reduced. Considering comprehensively, the temperature of the billet can be set at about 390 ℃ within the scope of this study.</p>

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Effect of billet temperature on deformation heat and forming quality of magnesium alloy wheel produced by backward extrusion

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yanchao Jiang,
  • Yatong Zhu,
  • Xuewen Chen,
  • Qichi Le,
  • Xi Yang,
  • Hairui Zhang,
  • Junqing Guo,
  • Tong Wang

摘要

In the range of 360 ~ 420 ℃, the effect of billet temperature on the deformation heat and forming quality of magnesium alloy wheels was analyzed by constructing the numerical model of backward extrusion. It is found that with the increase of billet temperature, the tonnage required for wheel-forming decreases, the deformation heat decreases, and the effective stress decreases and tends to be uniform. However, when the billet temperature is too high (420 ℃), the deformation heat makes the billet temperature exceed the melting point of the second phase, which leads to the microstructure in the shear zone of the wheel easily over-burning. Billet temperature has little effect on the dynamic recrystallization (DRX) volume fraction of the wheel. However, the forming time and the effective strain are the same, and the grain size of the wheel grows with higher temperature. The cracking tendency of the rim on the wheel decreases with the increase of billet temperature. The high temperature reduces the effective stress at the upper rim, indicating that the maximum tensile stress at the upper rim is reduced. Considering comprehensively, the temperature of the billet can be set at about 390 ℃ within the scope of this study.