Microstructural and mechanical evolutions during the forging step of the COBAPRESS, a casting/forging process
Microstructural and mechanical evolutions during the forging step of the COBAPRESS, a casting/forging process
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COBAPRESS（铸造/锻造工艺）锻造步骤期间的微观结构和机械演变
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发表时间：
2012
期刊：
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通讯作者：
Véronique Bouvier
中科院分区：
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作者：
F. Perrier;C. Desrayaud;Véronique Bouvier
铝铸造/锻造工艺用于生产汽车行业的零件。在这项研究中，我们研究了锻造步骤对锶改性的A356铝合金的显微组织和力学性能的影响。首先，设计了一个样品，使我们能够在锻造前后对合金进行机械测试。有限元分析与ABAQUS软件预测的最大应变的核心标本。EBSD技术的观察证实了更强烈的亚结构化的树突细胞在这个区域。屈服强度，极限抗拉强度，伸长率和疲劳寿命，然后改善的铸造/锻造样品相比，只有铸造标本。在锻造步骤期间孔隙的闭合和表面质量的改善也增强了样品的抗疲劳性。
Aluminum casting/forging processes are used to produce parts for the automotive industry. In this study, we examined the influence of the forging step on the microstructure and the mechanical properties of an A356 aluminum alloy modified with strontium. Firstly, a design of samples which allows us to test mechanically the alloy before and after forging was created. A finite element analysis with the ABAQUS software predicts a maximum of strain in the core of the specimens. Observations with the EBSD technique confirm a more intense sub-structuration of the dendrite cells in this zone. Yield strength, ultimate tensile strength, elongation and fatigue lives were then improved for the casting/forging samples compared to the only cast specimens. The closure of the porosities and the improvement of the surface quality during the forging step enhance also the fatigue resistance of the samples.