Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2016 - zeszyt 5

The microstructure of the Sanicro 25 steel after steam oxidation studied by advanced electron microscopy and spectroscopy methods

10.15199/28.2016.5.3

nr katalogowy: 101850
10.15199/28.2016.5.3

Increase of the coal fired power plants efficiency is inseparable with an increase of the steam conditions. Currently used 9÷12% Cr steels are not able to withstand pressure of 30 MPa at 700°C for a long time due to their microstructure instability leading to fast damage. Development of new Fe-based materials able to work under advanced ultra-supercritical (A-USC) conditions for a long time is the key of importance. Present paper deals with a microstructure of the prospective, 22% Cr austenitic steel, Sanicro 25, heat treated or oxidized in water vapour at 700°C. Detailed characterization of the steel was performed using X-ray diffractometry as well as scanning and transmission electron microscopy techniques. Investigation led to establish the effect of temperature and water vapour environment on the microstructure stability of this modern austenitic steel. The results showed that the microstructure of the aged steel consists of M23C6 and Laves phase precipitated on the grain boundaries as well as ε-Cu, NbN, M23C6 and Z-phase precipitated within the grains. After oxidation at 700°C up to 5000 h in water vapour, Sanicro 25 developed a thin protective oxide scale at the surface, consisting mainly of Cr2O3 plates, characteristic for steels oxidation in vapour. Key words: Sanicro 25, TEM, oxidation, water vapour, A-USC.1. INTRODUCTION Nowadays, environmental protection takes a particular significance due to high emission of CO2, which is one of the major greenhouse gases causing global warming. Major CO2 sources are coal-fired power plants, therefore particular efforts are made in order to decrease the CO2 emission by increasing the thermal efficiency of the power plants due to enhancing temperature and pressure of the steam to 700°C and 30 MPa, respectively. Such change, however, has strong impact on the microstructure stability and lifetime of the currently used materials. Commonly used 9÷12% Cr steels are not suitable to operate at t[...]

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