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Failure Analysis of TP347H Austenitic Heat-Resistant Steel Tube in a 600 MW Subcritical Thermal Power Unit.
- Source :
- Journal of Failure Analysis & Prevention; Apr2024, Vol. 24 Issue 2, p650-658, 9p
- Publication Year :
- 2024
-
Abstract
- The failure mechanism of TP347H austenitic heat-resistant steel tube serviced in boiler superheater in a 600 MW subcritical thermal power unit is presented in this paper. Through microstructure observation, energy-dispersive spectrometry analysis, and selected electron diffraction, the mechanism of TP347H superheater bend tube failure is found to be attributed to intergranular corrosion cracking, more M<subscript>23</subscript>C<subscript>6</subscript> and primary NbC(N) phase precipitating and coarsening along the grain boundary and formation of high content of slip lines and α′-martensite structure. The α′-martensite kept the Kurdjumov–Sachs (K-S) orientation relationships with parent austenite phase (γ-parent), which generated in TP347H bend tube may be related to the deformation-induced martensite (DIM) during rolling and cold working. The α′-martensite nucleated mainly at the grain boundary intersection between the twin crystal and γ-parent and grew inwards along the twin band. The dislocation density at the intersection is larger, and the secondary NbC(N) phase inhibited the nucleation of α'-martensite. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15477029
- Volume :
- 24
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Failure Analysis & Prevention
- Publication Type :
- Academic Journal
- Accession number :
- 176627614
- Full Text :
- https://doi.org/10.1007/s11668-024-01867-0