Abstract
A 5Cr-0.5Mo steel was coated by hot-dipping into a molten Al-10 wt.% Si bath at 700°C for 10, 60, 120 and 180 seconds, respectively. Phase identification of the Fe-Al-Si intermetallic compounds formed in the aluminide layer during hot-dipping was carried out by using a combination of scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The results after a hot dipping of 10 seconds showed that a hexagonal τ5(subscript (H))-Al7Fe2Si continuous layer formed adjacent to the steel substrate, while a lump of cubic τ5(subscript (C))-Al7(Fe, Cr)2Si phase floated in the Al-Si topcoat above the τ5(subscript (H))-Al7Fe2Si continuous layer. As the hot-dipping time increased, the lump transformed in shape into dispersive particles in the Al-Si topcoat above the τ5(subscript (H))-Al7Fe2Si continuous layer. After a hot-dipping of 180 seconds, monoclinic τ6-Al4FeSi and tetragonal τ4-Al3FeSi2 in needle shape were found in the Al-Si topcoat that contained the dispersive τ5(subscript (C))-Al7(Fe, Cr)2Si particles.
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