Determination of Facet Plane and Cleavage Fracture Plane of the Top Dross Formed in a Molten Zinc Bath

In a molten zinc bath of a continuous galvanizing line, top dross particles crystallize as Fe2Al5, an intermetallic compound containing Zn. These particles readily adhere to the steel sheets, causing surface defects. Therefore, controlling the top dross particles is a key issue. The present study fo...

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Bibliographic Details
Published inISIJ International Vol. 61; no. 1; pp. 335 - 342
Main Authors Konishi, Takeshi, Shibata, Mina, Miki, Junpei, Ushioda, Kohsaku
Format Journal Article
LanguageEnglish
Published The Iron and Steel Institute of Japan 15.01.2021
Subjects
cleavage plane
crystal growth
electron back scattering diffraction
facet plane
Fe2Al5
molten zinc
serial sectioning
three-dimensional analysis
top dross
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Summary:In a molten zinc bath of a continuous galvanizing line, top dross particles crystallize as Fe2Al5, an intermetallic compound containing Zn. These particles readily adhere to the steel sheets, causing surface defects. Therefore, controlling the top dross particles is a key issue. The present study focused on determining the facet plane of top dross particles via three-dimensional analysis of morphology by serial sectioning and electron back scattering diffraction (EBSD). Furthermore, the crystallographic plane of the cleavage fracture surface of the top dross was determined by EBSD, after a cleavage crack was introduced by Vickers hardness indentation. The facet planes of the top dross consist of two planes of (001), four planes of {110}, and eight planes of {111}. In addition, the top dross particles grow fastest in the [001] direction. Consequently, the top dross particle was concluded to possess a polyhedron structure with 14 facet planes. Finally, the cleavage fracture surface of the main crack in the top dross is the (100) plane.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.ISIJINT-2020-361