Formation of intermetallic phases in Al-coated hot-stamped 22MnB5 sheets in terms of coating thickness and Si content
作者： M. Windmann , A. Röttger , W. Theisen
DOI: 10.1016/J.SURFCOAT.2014.02.056
关键词:
摘要: Abstract AlSiFe coatings with differing thicknesses and Si contents were applied to steel sheets by hot dipping. The austenitized at TAUS = 920 °C for different dwell times then quenched in water. Phase formation as a function of coating thickness content the substrate/coating interface was investigated ex-situ phase analysis synchrotron radiation electron backscatter diffraction (EBSD). X-ray (XRD) EBSD investigations confirmed AlFe-rich intermetallics steel/coating result strong diffusion elements Al Fe. Within first minute, Fe into partially melted Al-base promotes type Al8Fe2Si, Al13Fe4, Al5Fe2. After has transformed completely Al–Fe intermetallics, substrate becomes more pronounced, thus reducing promoting phases Al2Fe AlFe an Al-rich bcc layer substrate. transformation kinetics resulting Al-, Fe-rich are influenced chemical composition coating. On one hand, faster saturation is promoted shorter path therefore thinner thickness. Otherwise, influences diffusivity Si-richer which act nuclei Fe-richer intermetallics.
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