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Modeling of diffusion processes during carburization of alloys

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Abstract

A Model was developed for the finite-difference calculation of carburization profiles in high-temperature alloys. The method includes the ternary crossdiffusion effect due to substitutional alloying elements that are preferentially oxidized. It can be used to treat cases such as carburization of preoxidized alloys or simultaneous oxidation and carburization. Up to three distinct types of carbide precipitation reactions can be included in the calculations. The solubility product is computed for each reaction and the amount of C that reacts is removed from the diffusion process. The model can treat two sets of boundary conditions corresponding to the presence or absence of a protective oxide scale. For comparison, under protective conditions carburization profiles were obtained for preoxidized alloys using C14 radioactive tracer. The application of the model yields values for the diffusivities of C in the alloys tested. Under nonprotective conditions, the predictions of the model were compared to carburization profiles reported for pack carburization tests. The method is able to predict maximum carbide levels and penetration depths for different alloys in various conditions and can be used in the selection and design of high-temperature alloys for use in carburizing environments.

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Author notes

  1. D. Farkas

    Present address: Department of Materials Engineering, Virginia Polytechnic Institute and State University, 24601, Blacksburg, Virginia

Authors and Affiliations

  1. Department of Physical Chemistry, Max Planck Institut fur Eisenforschung, 4 Dusseldorf, Germany

    D. Farkas & K. Ohla

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  1. D. Farkas
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  2. K. Ohla
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Farkas, D., Ohla, K. Modeling of diffusion processes during carburization of alloys. Oxid Met 19, 99–115 (1983). https://doi.org/10.1007/BF01225978

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  • DOI: https://doi.org/10.1007/BF01225978

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