X-ray diffraction and scanning electron microscopy of galvannealed coatings on steel |
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Authors: | P Schmid K Uran F Macherey M Ebert H-J Ullrich D Sommer F Friedel |
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Institution: | 1.ThyssenKrupp Steel AG, Werkstoffkompetenzzentrum,Duisburg,Germany;2.TU Darmstadt, Institut für angewandte Geowissenschaften,Darmstadt,Germany;3.TU Dresden, Institut für Werkstoffwissenschaft,Dresden,Germany |
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Abstract: | The formation of Fe–Zn intermetallic compounds, as relevant in the commercial product galvannealed steel sheet, was investigated
by scanning electron microscopy and different methods of X-ray diffraction. A scanning electron microscope with high resolution
was applied to investigate the layers of the galvannealed coating and its topography. Grazing incidence X-ray diffraction
(GID) was preferred over conventional Bragg–Brentano geometry for analysing thin crystalline layers because of its lower incidence
angle α and its lower depth of information. Furthermore, in situ experiments at an environmental scanning electron microscope (ESEM)
with an internal heating plate and at an X-ray diffractometer equipped with a high-temperature chamber were carried out. Thus,
it was possible to investigate the phase evolution during heat treatment by X-ray diffraction and to display the growth of
the ζ crystals in the ESEM. |
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Keywords: | X-ray diffraction Grazing incidence X-ray diffraction Environmental scanning electron microscopy Fe– Zn phase formation High-temperature in situ observation |
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