铁、锶和凝固时间对铝硅铸造合金中孔隙形成的作用要点

IF 2.6 3区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING International Journal of Metalcasting Pub Date : 2024-08-12 DOI:10.1007/s40962-024-01409-2
E. Samuel, A. M. Samuel, H. W. Doty, S. Valtierra, F. H. Samuel
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引用次数: 0

摘要

本研究旨在阐述控制 A319.2 Al-Si 合金微观结构特征的参数与铁含量(0.12-0.8%)、锶添加量(约 250 ppm)和凝固时间(586 秒与 513 秒)的函数关系。为了进行比较,对 A356.2 合金采用了选定的条件。使用热石墨模具和端冷模具时,沿液体/固体界面的凝固速率不同,DAS 值的范围为 ~23-85μm,对应于冷端上方 5、10、30、50 和 100 mm 的水平。锶的加入导致了β-Al5FeSi 小板的破碎。在类似的铁含量和凝固速率条件下,A319.2 合金比 A356.2 合金显示出更大的孔隙尺寸,这是因为后者不存在(Al-Al2Cu)反应,因此凝固时间更长。报告了四种类型的铁金属间化合物,即δ相、α相、β相和π相。
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Highlights on the Role of Fe, Sr, and Solidification Time on Porosity Formation in Al–Si Cast Alloys

The present study was undertaken to elaborate on the parameters controlling the microstructural characterization of A319.2 Al–Si alloys, as a function of iron content (0.12–0.8%), Sr addition (~250 ppm), and solidification time (586s vs 513s). For comparison, selected conditions were applied to A356.2 alloys. The use of a hot graphite mold and an end-chill mold provided different solidification rates along the liquid/solid interface, corresponding to DAS values in the range of ~23–85μm, corresponding to levels of 5, 10, 30, 50, and 100 mm above the chill end. Addition of strontium leads to fragmentation of β–Al5FeSi platelets. Under similar Fe level and solidification rate conditions, the A319.2 alloys exhibit larger pore sizes than the A356.2 alloys, due to the absence of the (Al–Al2Cu) reaction in the latter and hence longer solidification time. Four types of iron intermetallics were reported viz., δ-, α-, β-, and π-phases.

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来源期刊
International Journal of Metalcasting
International Journal of Metalcasting 工程技术-冶金工程
CiteScore
4.20
自引率
42.30%
发文量
174
审稿时长
>12 weeks
期刊介绍: The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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