Abstract

A 600 MW subcritical boiler high temperature reheater tube of 12Cr1MoV steel leaks after running for 11×104 h. Failure Analysis of the high temperature reheater is studied by optical microscope (OM), scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS), etc. The results show that under long-term service at high temperature, the alloy elements have been depleted in the matrix. The oxidation layer of the inner wall is too thick, and the micro-structure is degraded obviously. Many creep cavities and micro-cracks appear in the fire-facing side of the elbow. The micro-cracks extending along the grain boundaries are filled with oxide. In conclusion, the degradation of the microstructure caused by long term overheat is the main reason for the failure of 12Cr1MoV reheater tube, and the creep cracking causes the leak.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.