Predicting the Quantity and Type of Intermetallic Phases in Aluminum – Steel Dissimilar Joints Produced by Zinc Interlayer
Publish Year: 1400
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
INCWI22_026
تاریخ نمایه سازی: 16 فروردین 1401
Abstract:
In this study, the formation of brittle intermetallic compounds in over-lap joints of ۱۱۰۰ aluminum and low-carbon galvanized steel made by Gas - Tungsten arc welding method was investigated. The welding process was simulated by finite-element method and temperature histories during the welding process were derived from it. The Gibbs free energy of Fe-Al and Fe-Zn intermetallic phases were calculated and their formation was predicted by means of thermodynamic modeling. The growth behavior of IMCs at the interface of the joint was studied through optical and scanning electron microscopy and energy-dispersive X-ray spectroscopy. A relation was provided to predict the thickness of the formed compounds at the interface. The modeling results revealed the formation of FeAl۳ and Fe۲Al۵ compounds, which were consistent with the experimental results. Studying the compounds growth behavior proved that the zinc coating on galvanized steel can act as an interlayer to delay and limit the growth of intermetallic compounds at the interface. The thickness of the intermetallic layer in samples welded with ۱۰۰A and ۱۱۰A currents were ۶.۲ and ۱۰.۲ μm, respectively, which was reduced by an average of ۷۰% compared to the conditions without the presence of the zinc interlayer.
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Authors
Emad Cheraghi Rizi
PhD Student, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology
Eslam Ranjbarnodeh
Assistant Professor, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology
Seyyed Ehsan Mirsalehi
Associate Professor, Department of Materials and Metallurgical Engineering, Amirkabir University of Technology