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<p>The present work was conducted to investigate the influence of liquid metal treatment on the microstructure and mechanical properties (hardness and tensile) of parts made from 357 (Al-Si-Mg) and 220 (Al-Cu-Si) alloys using different casting methods commonly used for making cylinder heads. The microstructural constituents of the fabricated 357 and 220 alloys were characterized employing the thermal analysis method. In order to investigate improving the quality of parts produced using the lost foam casting process, the effect of major liquid metal treatments, i.e., modification, grain refinement, and degassing on the resulting microstructure and mechanical properties was evaluated on samples extracted from the cylinder head combustion chambers produced by the lost foam process. These were compared to simulating the types of casting process and molds typically utilized for this product, such as permanent mold and sand casting by using the ASTM B108 permanent mold, L-type metallic mold, and the end-chill mold. The results displayed a strong dependence on the mold type, solidification rate, and porosity content (from hydrogen gas and shrinkage). The hardness and yield strength values were mainly controlled by the level of magnesium in the alloy, while the ductility was mainly controlled by the porosity and the secondary dendrite arm spacing.</p>

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Effect of the Casting Process on the Microstructure and Tensile Properties of Al-Si-Mg and Al-Cu-Mg-Based Alloys

  • 期刊论文

  • 发表日期：

    2025年4月13日

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  • H. W. Doty,
  • H. R. Ammar,
  • A. M. Samuel,
  • F. H. Samuel

摘要

The present work was conducted to investigate the influence of liquid metal treatment on the microstructure and mechanical properties (hardness and tensile) of parts made from 357 (Al-Si-Mg) and 220 (Al-Cu-Si) alloys using different casting methods commonly used for making cylinder heads. The microstructural constituents of the fabricated 357 and 220 alloys were characterized employing the thermal analysis method. In order to investigate improving the quality of parts produced using the lost foam casting process, the effect of major liquid metal treatments, i.e., modification, grain refinement, and degassing on the resulting microstructure and mechanical properties was evaluated on samples extracted from the cylinder head combustion chambers produced by the lost foam process. These were compared to simulating the types of casting process and molds typically utilized for this product, such as permanent mold and sand casting by using the ASTM B108 permanent mold, L-type metallic mold, and the end-chill mold. The results displayed a strong dependence on the mold type, solidification rate, and porosity content (from hydrogen gas and shrinkage). The hardness and yield strength values were mainly controlled by the level of magnesium in the alloy, while the ductility was mainly controlled by the porosity and the secondary dendrite arm spacing.