Failure analysis of power plant boiler material |
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| Authors: | J. H. Ai H. Y. Lin Y. X. Qi |
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| Affiliation: | (1) School of Materials Science & Engineering, University of Science & Technology Beijing, 100083, P.R. China;(2) Tianjin Institute of Power Science, 300193 Tianjin, P.R. China;(3) Failure Analysis Institution of China Mechanic Engineering Society, 100083 Beijing, P.R. China |
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| Abstract: | ![]()
The failure of a boiler operating at 540°C and 9.4 MPa was investigated by evaluation of material removed from the near-failure region and by thermodynamic analysis. A scanning Auger microprobe, scanning electron microscope, and THERMO-CALC thermodynamic software (Thermo-Calc Software, Stockholm) were used in the investigation. Results showed that the segregation of impurity elements (phosphorous, tin, and nitrogen) to grain boundaries and the in-service formation of thin carbide films and granular carbides (Cr,Fe)23C6 on the grain boundaries were important factors in the failure process. |
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| Keywords: | boiler material failure analysis SAM THERMO-CALC software |
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