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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 297-301Effects of Nickel on Interface Morphology during...

Effects of Nickel on Interface Morphology during Oxidation of Fe-Cu-Ni Alloys

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Abstract:

Steel produced in Electric Arc Furnaces (EAF) contain a high amount of copper that causes a detrimental surface cracking phenomenon called hot shortness. Studies have found that nickel can alleviate hot shortness by increasing copper solubility in the Fe phase, decreasing oxidation rate and promoting occlusion [1-3]. Occlusion is a phenomenon whereby the copper-rich phase becomes incorporated into iron oxides. Nickel promotes occlusion by causing an uneven interface and increasing the number of internal oxides. The uneven interface is likely a result of the two concentration fields resulting from ternary diffusion of nickel, copper and iron in the Fe phase. This work is aimed at explaining why nickel causes wavy oxide/liquid-Cu and liquid-Cu/Fe interfaces. Constitutional super-saturation criterion [4] was applied to explain uneven interfaces caused by nickel. A model simulating diffusion behaviors of copper and nickel in Fe was developed by coupling Comsol Multiphysics® and Matlab®. Interface concentrations of copper and nickel and perturbation criterion values were calculated as a function of time. Modeling results show that (i) the nickel interface concentration first increases to a peak value then decreases slowly during oxidation process as a result of the change in oxidation rates, and (ii) the alloys with higher nickel contents have more potential for interface breakdown and this occurs within the initial linear oxidation regime.

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Diffusion in Solids and Liquids V

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Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Pages:

318-329

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.297-301.318

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Online since:

April 2010

Authors:

Lan Yin, S. Balaji, S. Seetharaman

Keywords:

Cu, Hot Shortness, Interface Perturbation, Modeling, Ni, Oxidation, Ternary Diffusion

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