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<p>This study investigates the influence mechanisms of processing parameters on the microstructure and mechanical properties in the extrusion casting-integrated forming of Al-Cu alloy steering knuckles, utilizing metallographic microscopy (OM) and scanning electron microscopy (SEM) characterization. The research yielded steering knuckle components with superior mechanical properties and globular microstructure through optimized processing parameters. After forging, large-sized void defects in the alloy were transformed into smaller shrinkage porosity and shrinkage cavity defects, while crack defects evolved into abnormal segregation. The grain size decreased by approximately 20 μm, with the secondary dendrite arm spacing (SDAS) nearly halved. The grains exhibited deformed microstructures, transitioning from dendritic to globular non-dendritic morphology. The convection induced by the forging process scours dendrite arms, and the detached dendrite arms form new grains, thereby achieving grain refinement. Simultaneously, the convection and stirring effects generated during forging homogenize compositional gradients within the melt, resulting in a microstructure characterized by reduced compositional segregation and the presence of deformed grains. This refined microstructure enhances the mechanical properties of the alloy.</p>

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Effect of Forging on the Microstructure and Mechanical Properties of Cast-Forging Integrated Knuckle Forming

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Chenxi Ma,
  • P. Shen,
  • G. J. Song,
  • H. Huang

摘要

This study investigates the influence mechanisms of processing parameters on the microstructure and mechanical properties in the extrusion casting-integrated forming of Al-Cu alloy steering knuckles, utilizing metallographic microscopy (OM) and scanning electron microscopy (SEM) characterization. The research yielded steering knuckle components with superior mechanical properties and globular microstructure through optimized processing parameters. After forging, large-sized void defects in the alloy were transformed into smaller shrinkage porosity and shrinkage cavity defects, while crack defects evolved into abnormal segregation. The grain size decreased by approximately 20 μm, with the secondary dendrite arm spacing (SDAS) nearly halved. The grains exhibited deformed microstructures, transitioning from dendritic to globular non-dendritic morphology. The convection induced by the forging process scours dendrite arms, and the detached dendrite arms form new grains, thereby achieving grain refinement. Simultaneously, the convection and stirring effects generated during forging homogenize compositional gradients within the melt, resulting in a microstructure characterized by reduced compositional segregation and the presence of deformed grains. This refined microstructure enhances the mechanical properties of the alloy.