Effect of Cr, Mo and W on the Microstructure of Al Hot Dipped Carbon Steels
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A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminizedby hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formedon the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe,whereas the alloy layer consisted of Al-Fe intermetallics such as Al5Fe2 and AlFe. Cr, Mo, and W in T22and T23 steels reduced the thickness of the topcoat and the alloy layer, and flattened the reaction frontof the aluminized layer, when compared to the low carbon steel.
Abstract
A low carbon steel, Fe-2.25%Cr steel (ASTM T22), and Fe-2.25%Cr-1.6%W steel (ASTM T23) were aluminizedby hot dipping into molten Al baths. After hot-dipping, a thin Al-rich topcoat and a thick alloy layer formedon the surface. The topcoat consisted primarily of a thin Al layer that contained a small amount of Fe,whereas the alloy layer consisted of Al-Fe intermetallics such as Al5Fe2 and AlFe. Cr, Mo, and W in T22and T23 steels reduced the thickness of the topcoat and the alloy layer, and flattened the reaction frontof the aluminized layer, when compared to the low carbon steel.
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