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Effect of Scale Microstructure on Scale Adhesion of Low Carbon Sheet Steel

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Abstract:

For industrial purposes, the adhesion control of secondary scale on hot rolled steel sheet is important. A basic study was carried out to clarify the effect of scale microstructure on the scale adhesion of low carbon steel (0.03%C-0.2%Mn). When scale of FeO (about 8μm thickness) was generated at 800°C and transformed by continuous cooling from 250~600°C to 200°C, the scale transformed from 400°C showed good adhesion. The scale consisted of magnetite seam from the steel substrate, lamellar structure of magnetite and α-Fe, and magnetite layer from the scale surface. The orientation analysis by TEM showed the relationship {110}Fe // {100}Fe3O4, <110>Fe // <100>Fe3O4, and the lattice strain was calculated as 4%. On the other hand, FeO/Fe substrate showed the relationship {100}Fe // {110}FeO, <110>Fe // <110>FeO, and 25% lattice strain was calculated. It is considered that the adhesion of scale should be affected by the lattice strain, thus Fe3O4/Fe substrate showed better adhesion than FeO/Fe substrate. The temperature of FeO formation also affects the scale adhesion through the extent of Fe super saturation in FeO.

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Periodical:

Materials Science Forum (Volumes 522-523)

Pages:

409-416

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.522-523.409

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Online since:

August 2006

Authors:

Akio Kobayashi, Kazuhiro Seto, Toshiaki Urabe, Katsumi Yamada, Kaoru Sato

Keywords:

Adhesion, Hematite, Lattice Strains, Magnetite, Scale, Steel, Transformation, Wüstite

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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