High-temperature Aluminizing Treatment of Stainless Steels Using Aluminum Foil

Abstract

The alloy layer formation during high-temperature aluminizing at diffusion temperature T_D from 1073 to 1273K in air was investigated for austenitic, ferritic and martensitic stainless steels. The void accumulation was observed in FeAl and αFe interface in high-temperature aluminized carbon steel, while in all stainless steels that were not observed. The alloy layers observed in stainless steels at T_D=1073K for the diffusion time t=0.6 ks were Fe₂Al₅ and Al₈Cr₅. With increasing T_D and t, FeAl layer and αFe layer appeared. As T_D and t increased further, Fe₂Al₅ disappeared, and finally become only two layers FeAl and αFe.