Abstract
In this investigation, a thermodynamic study was performed to predict the type and amount of possible oxides formed on interstitial-free high-strength (IFHS) steel substrate surface during the annealing treatment prior to dipping in a liquid zinc alloy bath. This study was carried out based on CALPHAD approach using the thermodynamic simulation software package Thermo-Calc by varying the annealing temperature and annealing atmosphere (dew point and gas composition). The experiments were performed on IFHS-350 grade steel substrate using hot-dip process simulator (HDPS) for varying annealing conditions (temperature: 780–830 °C and dew point: − 30 to + 10 °C). The specimens were characterized in as-annealed condition as well as after hot dipping in the galvanizing bath. This investigation was performed to find out the suitable combinations of annealing temperature and dew point for developing a good quality coating on IFHS grade steel substrate by eliminating the wettability issues. Good quality coating, free from bare spots, was obtained using an annealing gas atmosphere having 5%H2 and 95%N2 at (a) 780 °C with − 30 °C dew point, (b) 805 °C with − 10 °C dew point and (c) 830 °C with + 10 °C dew point. In general, coating quality was improved with low annealing temperatures and low dew point or high annealing temperature and high dew point conditions.
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The authors want to thank Tata Steel Limited, Jamshedpur, for financial support to carry out this work and CSIR-National Metallurgical Laboratory for facilitation of the experimental facilities.
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Sahoo, B.K., Walunj, M.G., Srivastava, V.C. et al. Elimination of Wettability Issues in Interstitial Free High Strength (IFHS) Steel by Controlling the Annealing Atmosphere. Trans Indian Inst Met 77, 1343–1353 (2024). https://doi.org/10.1007/s12666-023-03230-7
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DOI: https://doi.org/10.1007/s12666-023-03230-7