Effect of Iron-Aluminide Coating on the Fracture Mechanism of Ferritic–Martensitic Steel in Coal-Fired Boilers Environment
| Autor: | Chaur-Jeng Wang, Huan-Chang Liang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope 020209 energy Metallurgy Metals and Alloys Oxide chemistry.chemical_element Coal combustion products 02 engineering and technology engineering.material 01 natural sciences Corrosion Inorganic Chemistry chemistry.chemical_compound chemistry Coating Aluminium 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Materials Chemistry engineering Ductility Aluminide |
| Zdroj: | Oxidation of Metals. 92:457-470 |
| ISSN: | 1573-4889 0030-770X |
| DOI: | 10.1007/s11085-019-09941-x |
| Popis: | Due to the coal combustion that generates halides, steel components can confront hot corrosion during applications at high temperature. The hot-dipping aluminum (HDA) was operated on the 9Cr–Mo steel (grade 91) to form the iron aluminide layer. A hot corrosion-loading test of aluminized grade 91 (HDA-91) was carried out by covering a salt mixture of NaCl/Na2SO4 under static load ranging from 75 to 100 MPa at 600 °C and 700 °C, respectively. The failure mechanism was assessed after various elongations using scanning electron microscopy and optical microscopy. The results showed that HDA-91 presented higher hot corrosion resistance than the uncoated grade 91. The aluminide layer formed a higher ductility oxide and prevented the substrate form grain-boundary oxidation at high temperatures, resulting in durability. The results also revealed a significant improvement in reduction of area during the hot corrosion-loading test for grade 91 that underwent HDA treatment. |
| Databáze: | OpenAIRE |
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