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Computational Thermochemistry for Modelling Oxidation During the Conveyance Tube Manufacturing Process

MEGAN KENDALL, Mark Coleman, Hollie Cockings, Elizabeth Sackett Orcid Logo, Chris Owen, Michael Auinger Orcid Logo

Metals, Volume: 14, Issue: 12, Start page: 1402

Swansea University Authors: MEGAN KENDALL, Elizabeth Sackett Orcid Logo

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DOI (Published version): 10.3390/met14121402

Abstract

Conveyance tube manufacturing via a hot-finished, welded route is an energy-intensive process which promotes rapid surface oxidation. During normalisation at approximately 950 °C to homogenise the post-weld microstructure, an oxide mill scale layer grows on tube outer surfaces. Following further the...

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Published in: Metals
ISSN: 2075-4701
Published: MDPI AG 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa68478
Abstract: Conveyance tube manufacturing via a hot-finished, welded route is an energy-intensive process which promotes rapid surface oxidation. During normalisation at approximately 950 °C to homogenise the post-weld microstructure, an oxide mill scale layer grows on tube outer surfaces. Following further thermomechanical processing, there is significant yield loss of up to 3% of total feedstock due to scale products, and surface degradation due to inconsistent scale delamination. Delaminated scale is also liable to contaminate and damage plant tooling. The computational thermochemistry software, Thermo-Calc 2023b, with its diffusion module, DICTRA, was explored for its potential to investigate oxidation kinetics on curved geometries representative of those in conveyance tube applications. A suitable model was developed using the Stefan problem, bespoke thermochemical databases, and a numerical solution to the diffusion equation. Oxide thickness predictions for representative curved surfaces revealed the significance of the radial term in the diffusion equation for tubes of less than a 200 mm inner radius. This critical value places the conveyance tubes’ dimensions well within the range where the effects of a cylindrical coordinate system on oxidation, owing to continuous surface area changes and superimposed diffusion pathways, cannot be neglected if oxidation on curved surfaces is to be fully understood.
Keywords: Oxidation; modelling; steel; diffusion; heat treatment
College: Faculty of Science and Engineering
Funders: This research was funded by COATED M2A from the European Social Fund via the Welsh Government (c80816), the Engineering and Physical Sciences Research Council (Grant Ref: EP/S02252X/1), and Tata Steel.
Issue: 12
Start Page: 1402

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