(1. 洛陽理工學(xué)院 材料系，洛陽 471023；2. 河南科技大學(xué) 材料科學(xué)與工程學(xué)院，洛陽 471023；3. 洛陽石化工程公司，洛陽 471003)
摘 要: 采用740 ℃熱浸鍍鋁方法，在20碳鋼表面制備熱浸鍍鋁層。鍍鋁層經(jīng)850 ℃擴(kuò)散處理4 h后，采用SEM和XRD確定擴(kuò)散層的相組成，采用TEM研究組成相的晶體學(xué)取向關(guān)系。分析AlFe3C0.5相的形成原因。結(jié)果表明：擴(kuò)散層與基體之間存在Fe3Al、FeAl和點(diǎn)陣常數(shù)為0.377 nm的針葉狀AlFe3C0.5相；針狀AlFe3C0.5與Fe3Al相之間存在的晶體學(xué)取向關(guān)系是
、
關(guān)鍵字: 熱浸鍍鋁鋼；擴(kuò)散層；Fe3AlC0.5相；晶體學(xué)
（1. Department of Materials Engineering, Luoyang Institute of Science and Technology, Luoyang 471003, China;2. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China;3. Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China）
Abstract:The aluminized coating on 20 carbons steel was prepared by hot dip aluminizing method at 740 ℃. After the coating diffusion treatment at 850 ℃ for 4 h, the microstructure of the interface between the diffusion layers and steel substrate was determined by scanning electronic microscopy and X-ray diffractometry, and the lattice orientation relation between constituent phases was analyzed by transmission electron microscopy. The formation mechanisms of Fe3AlC0.5 phase were also discussed. The results indicate that Fe3Al, FeAl and needle-like AlFe3C0.5 phase with lattice constant of 0.377 nm exist between the diffusion layers and steel substrate. In addition，the lattice orientation relation between AlFe3C0.5 and Fe3Al is , .
Key words: hot dip aluminizing; diffusion layer; AlFe3C0.5 phase; crystallography
