废钢界面碳扩散过程的数值模拟研究

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中图分类号：TF1 文献标志码：A doi：10.12415/j.issn.1671-7872.25123

Abstract：Aiming at the crucial role of surface carburization in reducing the melting point of scrap steel， thereby promoting overall melting and increasing the carbon content of the molten pool during its melting process in converters or electric arc furnaces，an Fe-C diffsion model was constructed based on theunsteady diffusion-mass transfer theory in media.The diffusion behavior ofcarbon on the surface of the iron matrix and the variation pattem of the melting point at the carburized locations were investigated using numerical simulation methods.The effects of factors such ascarburization time， temperature，carbon particle size，and the rust layer on the iron surface on the carburization effectivenesswere also explored.The results show that the interfacial carburization reaction is weak within the lower temperature range （500-900% ），and the migration ability of carbon atoms is poor. When the temperature rises to 1200∘C ， the carburization depth increases significantly by 67% compared to that at 1100∘C Carbon particle size has a notable impact on the carburization effect： smaler particle sizes favor carburization， but when the particle size is refined to 100μm ， further reduction in size leads to only a limited increase in carburization depth.Inaddition，the surfacerustlayer markedly promotes interfacial carbon migration; whenarust layer is present onthe iron substrate，the carburization depth increases by more than three times relative to the rust-free condition.This research provides a theoretical reference for developing efficient scrap preheating carburization and rapid-melting briquette processes.By improving scrap melting eficiency，it can directly reduce smelting energy consumption and carbon emissions，offering clear guidance for advancing the green transformation of the steel industry.

Keywords：scrapsteel; carburization;rust layer; numerical simulation; electricarc furnace;converter;interfacial reaction;high-temperaturediffusion

在钢铁工业绿色转型与循环经济发展进程中，废钢作为一种载能、低碳的可循环资源，其高效利用对降低“三废”排放与资源消耗意义重大[1-4]。（剩余12687字）