Phase Evolution in Galvanneal Coatings on Steel Sheets
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概要
- 論文の詳細を見る
The evolution of the phases in galvanneal coatings on IF and IFP steel sheets is studied by combining optical microscopy (OM), scanning electron microscopy (SEM) with X-ray microanalysis (EDS) and transmission electron microscopy (TEM). The early stage of galvannealing is dominated by the formation of intermetallic compounds, particularly δ phase by constitutional supercooling except the region near the steel substrate where rapid formation of a thin alloy layer, the nature of which depends strongly on surface segregation of minor elements such as phophorus in a steel substrate. The <I>Γ</I> phase, which shows a well-defined columnar structure, grows at the expense of the <I>Γ</I><SUB>1</SUB> phase. The thickness of the <I>Γ</I><SUB>1</SUB> phase decreases, while maintaining the total thickness of (<I>Γ</I>+<I>Γ</I><SUB>1</SUB>) constant, 2 μm, during galvannealing, Three different grain morphologies of δ phase have been observed. The surface segregation of phosphorus in steel was found to promote the nucleation of the <I>Γ</I><SUB>1</SUB> phase at the solid-liquid interface in the very beginning of galvannealing. The formation of the <I>Γ</I> phase was retarded accordingly. The hot-dip simulator was found to reproduce the microstructures of galvanneal coatings obtained by the in-line production and to facilitate the investigation of the phase evolution during hot-dip galvanizing and galvannealing.
- 社団法人 日本鉄鋼協会の論文
- 1995-05-15
著者
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Meshii M
Northwestern Univ. Il Usa
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Lin C.
Department Of Electrical Engineering National Cheng Kung University
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Lin C.
Department Of Materials Science And Engineering Northwestern University
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MESHII M.
Department of Materials Science and Engineering, Robert R. McCormick School of Engineering and Appli
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CHENG C.
Research and Development, Inland Steel Company
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Lin C.
Department Of Bioenvironmental Systems Engineering National Taiwan University
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Cheng C.
Research And Development Inland Steel Company
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