MATEC Web Conf.
Volume 253, 20192018 International Conference on Materials Science and Manufacturing Engineering (MSME 2018)
|Number of page(s)||5|
|Section||Material Manufacturing & Process|
|Published online||14 January 2019|
The Influence of Long-term Ageing on the Microstructure of Sanicro 25 Steel
Silesian University of Technology, Institute of Engineering Materials and Biomaterials, 18A Konarskiego Str., 44100 Gliwice, Poland
2 Institute for Ferrous Metallurgy, K. Miarki 12-14, 44100 Gliwice, Poland
3 Czestochowa University of Technology, Institute of Materials Engineering, Al. Armii Krajowej 19, 42200 Czestochowa, Poland
a Corresponding author : email@example.com
Sanicro 25 (22Cr25NiWCoCu) is a newly developed austenitic stainless steel used in the boiler pressure superheaters and reheaters with ultra-supercritical high-efficient parameters. The paper presents the results of microstructure testing and secondary phase separation processes after 20,000 h ageing at 700 and 750 °C. In the initial stage of ageing, the precipitation of numerous very small M23C6 chromium carbides and Laves phase were observed. The long-term ageing related to temperature revealed the existence of secondary phases: M23C6, MX, NbCrN, Laves phase and σ phase. The test results presented in the paper are part of the developed material characteristics to be used for predicting the service life of the material of components operated under creep conditions.
© The Authors, published by EDP Sciences, 2019
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