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Failure Analysis of TP347H Austenitic Heat-Resistant Steel Tube in a 600 MW Subcritical Thermal Power Unit

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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 M23C6 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.

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Authors and Affiliations

  1. China Datang Corporation Science and Technological Research Institute Northwest Power Technology Research Institute, Xi’an, China

    Jun Zhang, Jingming Yan, Jianwei Zhang, Zhunbei Zheng, Zhanjun Yang & Ning Zhou

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  1. Jun Zhang
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Zhang, J., Yan, J., Zhang, J. et al. Failure Analysis of TP347H Austenitic Heat-Resistant Steel Tube in a 600 MW Subcritical Thermal Power Unit. J Fail. Anal. and Preven. 24, 650–658 (2024). https://doi.org/10.1007/s11668-024-01867-0

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