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Effect of water pressure and soaking time on the selective oxidation of DP980 advanced high strength steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.
State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.
2018 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 453, p. 252-262Article in journal (Refereed) Published
Abstract [en]

Due to the limited heating power in non-oxidation furnace of continuous strip processing facilities of heating stage, selective oxidation with higher oxygen pressure is practically inevitable, which will greatly influence the quality of coating during immersion into the zinc bath. In this paper, the oxidation behaviors of DP980 advanced high strength steel are studied during annealing in a pure H2 atmosphere with controlled water pressure ranging from 0.033 to 0.094 bar (PH2O/PH2) and soaking time from 30 s to 2 h. The oxidation proceeds as a combination of external formation of Mn oxides and internal formation of Mn2SiO4, MnSiO3 and SiO2 from the subsurface of the steel into the matrix. As the water pressure increases from 0.033 to 0.094 bar, it can be seen that the amount of oxide particles and coverage on the surface of the steel seems to decrease initially and increase afterwards. The sequence of oxides determined by oxygen partial pressure was calculated and illustrated using thermodynamics with alloys activity. Oxide growth mechanism during annealing and the effect of water pressure on the amount of oxide particles were also discussed.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 453, p. 252-262
Keywords [en]
Activity of alloying elements, DP980 AHSS, Internal oxidation, Oxide growth, Selective oxidation
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-229270DOI: 10.1016/j.apsusc.2018.05.034ISI: 000436940800030Scopus ID: 2-s2.0-85047060017OAI: oai:DiVA.org:kth-229270DiVA, id: diva2:1212095
Note

QC 20180601

Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-07-24Bibliographically approved

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