ENVIRONMENTALLY-ASSISTED CRACKING OF TYPE 316L AUSTENITIC STAINLESS STEEL IN A HYDROGENATED STEAM ENVIRONMENT

1,2 JANOUŠEK Jaromír
Co-authors:
3 SCENINI Fabio 3 VOLPE Liberato 1 HOJNÁ Anna 3 BURKE Mary Grace
Institutions:
1 Research Centre Rez, Hlavní 130, 250 68 Husinec-Řež, Czech Republic, EU, jas@cvrez.cz
2 University of West Bohemia, Faculty of Mechanical Engineering, Department of Material Science and Technology, Univerzitní 22, 306 14 Plzeň, Czech Republic, EU
3 The University of Manchester, Material Performance Centre, Manchester, United Kingdom
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
550-555
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
26 views / 9 downloads
Abstract

A low pressure superheated hydrogen steam system has been used to accelerate the oxidation kinetics while keeping the electrochemical conditions similar to those of the primary water in a pressurized water reactor. A special corrosion apparatus was built in cooperation with University of Manchester and Škoda JS for the purpose. The initiation is investigated using a Constant Extension Rate Test (CERT) with flat tapered specimens made from Type 316L austenitic stainless steel in the vapour environments at 350 °C. Two different surface finishes were used: as-ground and as-polished. Constant extension rate tests with a test rate of 2×10-6 ms-1 were performed on 4 specimens - at room temperature and at an elevated temperature of 350 °C and as a more oxidizing environment was chosen R = 1/6, on the contrary as a more reducing environment was chosen R = 6, where parameter R represents the ratio between the oxygen partial pressure at the Ni/NiO transition and the oxygen partial pressure. Post-test evaluation using SEM was applied.

Keywords: Environmentally Assisted Cracking, hydrogenated steam, oxidation
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