Optimisation of melt pouring temperature and low superheat casting of Al-15Mg2Si-4.5Si composite

IF 1.3 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING

International Journal of Cast Metals Research Pub Date : 2023-05-04 DOI:10.1080/13640461.2023.2211895

P. Das

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引用次数: 1

Abstract

ABSTRACT In this study, a computational fluid dynamics (CFD) model is employed to optimise the melt pouring temperature during Low superheat casting (LSC) of the Al-15 Mg2Si-4.5Si composite. The die cavity considered to perform the die filling simulations corresponds to the as-cast tensile specimens, as per ASTM B557 guidelines. The findings of the study include melt temperature distribution, solid fraction distribution during filling as well as during solidification, velocity distribution of the melt and surface defect concentration. Experimentation is performed to develop low superheat cast composite based on the numerically estimated optimum melt pouring temperature of 650°C. Mixture of irregular dendritic, polygonal and equiaxed shaped primary Mg2Si grains are observed within the cast parts, whereas primary Al grains are found to be of dendritic morphology with occasional presence of spheroids. Marked improvements in microstructure and mechanical properties have been evidenced in the LSC composite compared to its conventional cast counterpart.

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Al-15Mg2Si-4.5Si复合材料熔体浇注温度优化及低过热铸造

摘要采用计算流体力学(CFD)模型对Al-15 Mg2Si-4.5Si复合材料低过热铸造(LSC)过程中的熔体浇注温度进行了优化。根据ASTM B557准则，考虑执行模具填充模拟的模腔对应于铸态拉伸试样。研究结果包括熔体温度分布、填充和凝固过程中固体分数分布、熔体速度分布和表面缺陷浓度。以数值计算的最佳熔体浇注温度650℃为基础，进行了低过热铸造复合材料的试验研究。在铸件中观察到不规则枝晶、多边形和等轴形状的Mg2Si初生晶粒的混合，而Al初生晶粒则为枝晶形态，偶有球体存在。与传统的铸造复合材料相比，LSC复合材料的显微组织和力学性能有了明显的改善。

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来源期刊

International Journal of Cast Metals Research 工程技术-冶金工程

CiteScore

2.70

自引率

7.10%

发文量

审稿时长

7.5 months

期刊介绍： The International Journal of Cast Metals Research is devoted to the dissemination of peer reviewed information on the science and engineering of cast metals, solidification and casting processes. Assured production of high integrity castings requires an integrated approach that optimises casting, mould and gating design; mould materials and binders; alloy composition and microstructure; metal melting, modification and handling; dimensional control; and finishing and post-treatment of the casting. The Journal reports advances in both the fundamental science and materials and production engineering contributing to the successful manufacture of fit for purpose castings.