Metastable microstructures at the interface between AISI 321 steel and molten aluminum during hot-dip aluminizing
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Date
2018
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Elsevier B.V.
Abstract
The microstructure at the interface between AISI 321 stainless steel and molten aluminum was investigated which occurs during the process of hot-dip aluminizing. Microstructural characterization was carried out by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The study revealed the formation of metastable FeAl<inf>m</inf> and multiple twinned Al<inf>13</inf>Fe<inf>4</inf> phases at the interface between steel and aluminum. Multiple twinned Al<inf>13</inf>Fe<inf>4</inf> phase exhibits pseudo tenfold electron diffraction pattern. Another metastable phase Al<inf>3</inf>(NiFe) with an orthorhombic structure was formed as one of the eutectic phase mixture in the solidified aluminum topcoat. The Al<inf>3</inf>(NiFe) phase in the eutectic shares crystallographic orientation relationship with the Al matrix. Metastable intermetallic phases are being reported for the first time during hot-dip aluminizing. © 2018 Elsevier B.V.
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Keywords
Aluminum, Aluminum alloys, Aluminum coated steel, Binary alloys, Eutectics, High resolution transmission electron microscopy, Interfaces (materials), Intermetallics, Metastable phases, Microstructure, Phase interfaces, Scanning electron microscopy, Stainless steel, Transmission electron microscopy, 321 Stainless Steel, Crystallographic orientation relationships, Hot dip aluminizing, Intermetallic phasis, Metastable microstructure, Micro-structural characterization, Orthorhombic structures, Scanning electrons, Austenitic stainless steel
Citation
Surface and Coatings Technology, 2018, 348, , pp. 22-30