Abstract
The properties of steel stubs change with each operational cycle of the Hall-Héroult process at high temperatures due to a carburization that occurs in carbon containing environments. The operability of carburized steels and its impact on the performance of the anodic assembly can be determined by evaluating the properties of new and recycled stubs. The chemical composition, mechanical, creep and thermo-physical properties were investigated to evaluate their changes regarding operational cycle and take into account in a numerical model for the assessment of their impact on the thermo-mechanical behavior of the anode, evolution of air gap between the anode and the cast iron connector, and voltage drop.
The first results show that the initial carbon content of the new stub 0.2% increases up to 1.1% after 2–3 years of operational cycles and accompanied by cardinal microstructure changes that contributes to change of thermal expansion, tensile and creep strength, elongation and specific heat.
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Lukovnikov, D. et al. (2015). On the Evolution of Steel Stub Thermo-Physical and Thermo-Mechanical Properties during Operational Stage of Anodic Assemblies. In: Hyland, M. (eds) Light Metals 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48248-4_198
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DOI: https://doi.org/10.1007/978-3-319-48248-4_198
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48610-9
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