The microstructure of aluminized type 310 stainless steel

• Published in: Surface & coatings technology Vol. 201; no. 6; pp. 3502 - 3509
• Main Authors: Hu, T.L., Huang, H.L., Gan, D., Lee, T.Y.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 04-12-2006; Elsevier
• Subjects: Aluminide coating; Applied sciences; Exact sciences and technology; Metallic coatings; Metals. Metallurgy; Pack cementation method; Production techniques; Surface treatment; Transmission electron microscopy (TEM); Type 310 stainless steel; Aluminide coating; Type 310 stainless steel; Transmission electron microscopy (TEM); Pack cementation method; Austenitic stainless steel; Intermetallic compound; Surface treatment; Aluminides; Metal coating; Transmission electron microscopy; Stainless steel; Pack carburizing; Microstructure
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2006.07.254

The aluminized coating on 310 stainless steel was prepared by pack cementation method and the microstructure of the coating was studied by transmission electron microscopy. The coating consists of a thick outer zone and a thin interfacial zone. The matrix of the outer zone is δ-Fe2Al5 with scattered Cr5Al8 grains. The interfacial zone is made up of two layers; a layer of mixed α-(Cr, Fe) and β-FeAl grains with β-FeAl precipitates in the α-(Cr, Fe) grain, and a β-FeAl layer. A thin layer of polygonized γ phase is present in the γ substrate next to the coating/substrate interface. Dense dislocations are present in the interfacial zone and the substrate near the coating/substrate interface. No crystallographic relationship was found at any of the interfaces between the layers.