Failure Analysis and Magnetic Evaluation of Tertiary Superheater Tube Used in Gas-Fired Boiler
| Autor: | Sujay Patil, J. N. Mohapatra, Rameshwar Sah, P. C. Krishna, B. Eswarappa |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Fish mouth Mechanical Engineering Boiler (power generation) 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology Magnetic hysteresis Microstructure 01 natural sciences Carbide Mechanics of Materials 0103 physical sciences General Materials Science Grain boundary Composite material 0210 nano-technology Superheater |
| Zdroj: | Journal of Materials Engineering and Performance. 27:580-589 |
| ISSN: | 1544-1024 1059-9495 |
| DOI: | 10.1007/s11665-018-3171-7 |
| Popis: | Failure analysis was carried out on a prematurely failed tertiary superheater tube used in gas-fired boiler. The analysis includes a comparative study of visual examination, chemical composition, hardness and microstructure at failed region, adjacent and far to failure as well as on fresh tube. The chemistry was found matching to the standard specification, whereas the hardness was low in failed tube compared to the fish mouth opening region and the fresh tube. Microscopic examination of failed sample revealed the presence of spheroidal carbides of Cr and Mo predominantly along the grain boundaries. The primary cause of failure is found to be localized heating. Magnetic hysteresis loop (MHL) measurements were carried out to correlate the magnetic parameters with microstructure and mechanical properties to establish a possible non-destructive evaluation (NDE) for health monitoring of the tubes. The coercivity of the MHL showed a very good correlation with microstructure and mechanical properties deterioration enabling a possible NDE technique for the health monitoring of the tubes. |
| Databáze: | OpenAIRE |
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