Study of Creep Damage in P92 Steel Using Acoustic Emission

0585550 - ÚFM 2025 RIV NL eng C - Konferenční příspěvek (zahraniční konf.)
Dvořák, Jiří - Král, Petr - Sklenička, Václav - Kvapilová, Marie - Šifner, J. - Koula, V. - Oháňková, M.
Study of Creep Damage in P92 Steel Using Acoustic Emission.
Procedia Structural Integrity. Vol. 52. Amsterdam: Elsevier B.V., 2024 - (Aliabadi, F.; Khodaei, Z.), s. 259-266. ISSN 2452-3216.
[FDM 2023 - International Conference on Fracture, Damage and Structural Health Monitoring /21./. London (GB), 12.09.2023-14.09.2023]
Grant CEP: GA TA ČR(CZ) TK03020089
Institucionální podpora: RVO:68081723
Klíčová slova: creep * P92 steel * creep deformation and fracture mechanisms
Obor OECD: Materials engineering

For pipeline systems operating for a long time in thermal and/or power plants at high temperature and pressure, the degree of creep degradation is a key factor for their safe operation. The advanced 9% chromium creep-resistant P92 steel is now widely used in modern power plant boiler pipes operated at steam temperatures up to 650 °C. In this work, the relationship between creep deformation and damage have been analysed. Constant load tensile creep tests were conducted at 600 °C under different applied stresses. The microstructure evolution after creep loading was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that long-term creep exposition led to coarsening of the size of M23C6 carbides and their precipitation at the grain boundary, which promotes intergranular creep cavitation and thus reduces the creep lifetime of the steel. The acoustic emission (AE) method was applied to monitor the formation and the rate of propagation of cracks arising from creep damage. This nondestructive method is able to detect in advance the degradation processes leading to high temperature component failure. The necessity for nondestructive examination rather than destructive investigation to identify creep damage is emphasized.
Trvalý link: https://hdl.handle.net/11104/0353301