{"title":"Effects of Annealing and Oxidation on the Microstructure of Hot-Dipped Aluminum–Silicon Coating of 316L Stainless Steel","authors":"","doi":"10.1007/s11669-024-01092-0","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>In this study, a continuous and dense FeAl/Al<sub>2</sub>O<sub>3</sub> gradient coating was prepared on the surface of 316L stainless steel by hot-dipping aluminizing, vacuum annealing and low-oxygen pressure oxidation. The results showed that when a hot-dipping pure aluminum was applied, the alloy compound layer was composed of (Fe, Cr, Ni)<sub>2</sub>Al<sub>5</sub> and (Fe, Cr, Ni)Al<sub>3</sub> phases. When the Si content in the bath was higher than 2.5 wt.%, a new intermetallic compound, Al<sub>7</sub>(Fe, Cr)<sub>2</sub>Si, appeared at the interface, and the thickness of the metal compound layer decreased continuously upon increasing the silicon content in the melt pool. When the hot-dipped sample was annealed in vacuum at 900 °C for 3 h, the brittle (Fe, Cr, Ni)<sub>2</sub>Al<sub>5</sub> phase was transformed into a ductile (Fe, Cr, Ni)Al phase. As low-oxygen pressure oxidation progressed, FeAl/Al<sub>2</sub>O<sub>3</sub> gradient coatings were formed on the surface layer. The oxide film formed by the Al-2.5 Si wt.% sample was flatter and denser, which significantly improved its high-temperature oxidation resistance. Reducing the oxygen partial pressure promoted the external oxidation of Al element and the formation of Al<sub>2</sub>O<sub>3</sub> oxide film.</p>","PeriodicalId":657,"journal":{"name":"Journal of Phase Equilibria and Diffusion","volume":null,"pages":null},"PeriodicalIF":1.5000,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Phase Equilibria and Diffusion","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s11669-024-01092-0","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
In this study, a continuous and dense FeAl/Al2O3 gradient coating was prepared on the surface of 316L stainless steel by hot-dipping aluminizing, vacuum annealing and low-oxygen pressure oxidation. The results showed that when a hot-dipping pure aluminum was applied, the alloy compound layer was composed of (Fe, Cr, Ni)2Al5 and (Fe, Cr, Ni)Al3 phases. When the Si content in the bath was higher than 2.5 wt.%, a new intermetallic compound, Al7(Fe, Cr)2Si, appeared at the interface, and the thickness of the metal compound layer decreased continuously upon increasing the silicon content in the melt pool. When the hot-dipped sample was annealed in vacuum at 900 °C for 3 h, the brittle (Fe, Cr, Ni)2Al5 phase was transformed into a ductile (Fe, Cr, Ni)Al phase. As low-oxygen pressure oxidation progressed, FeAl/Al2O3 gradient coatings were formed on the surface layer. The oxide film formed by the Al-2.5 Si wt.% sample was flatter and denser, which significantly improved its high-temperature oxidation resistance. Reducing the oxygen partial pressure promoted the external oxidation of Al element and the formation of Al2O3 oxide film.
期刊介绍：
The most trusted journal for phase equilibria and thermodynamic research, ASM International''s Journal of Phase Equilibria and Diffusion features critical phase diagram evaluations on scientifically and industrially important alloy systems, authored by international experts.
The Journal of Phase Equilibria and Diffusion is critically reviewed and contains basic and applied research results, a survey of current literature and other pertinent articles. The journal covers the significance of diagrams as well as new research techniques, equipment, data evaluation, nomenclature, presentation and other aspects of phase diagram preparation and use.
Content includes information on phenomena such as kinetic control of equilibrium, coherency effects, impurity effects, and thermodynamic and crystallographic characteristics. The journal updates systems previously published in the Bulletin of Alloy Phase Diagrams as new data are discovered.
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