Surface Selective Oxide Reduction During the Intercritical Annealing of Medium Mn Steel

Third generation advanced high-strength steels achieve an excellent strength–ductility balance using a cost-effective alloy composition. During the continuous annealing of medium Mn steel, the formation of an external selective oxide layer of MnO has a negative impact on the coating quality after ga...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2017-08, Vol.48 (8), p.3635-3641
Hauptverfasser: Jo, Kyoung Rae, Cho, Lawrence, Oh, Jong Han, Kim, Myoung Soo, Kang, Ki Cheol, De Cooman, Bruno C.
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container_issue 8
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container_title Metallurgical and materials transactions. A, Physical metallurgy and materials science
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creator Jo, Kyoung Rae
Cho, Lawrence
Oh, Jong Han
Kim, Myoung Soo
Kang, Ki Cheol
De Cooman, Bruno C.
description Third generation advanced high-strength steels achieve an excellent strength–ductility balance using a cost-effective alloy composition. During the continuous annealing of medium Mn steel, the formation of an external selective oxide layer of MnO has a negative impact on the coating quality after galvanizing. A procedure to reduce the selective oxide was therefore developed. It involves annealing in the temperature range of 1073 K to 1323 K (800 °C to 1050 °C) in a HN x gas atmosphere. Annealing at higher temperatures and the use of larger H 2 volume fractions are shown to make the gas atmosphere reducing with respect to MnO. The reduction of the surface MnO layer was observed by SEM, GDOES, and cross-sectional TEM analysis.
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subjects Annealing
Characterization and Evaluation of Materials
Chemistry and Materials Science
Communication
Composition effects
Continuous annealing
Cross-sections
Ductility
Galvanizing
High strength steel
High strength steels
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Reduction
Structural Materials
Surfaces and Interfaces
Thin Films
title Surface Selective Oxide Reduction During the Intercritical Annealing of Medium Mn Steel
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