THE EFFECT OF SPECIMEN SIZE FOR THE P91 STEEL AT ELEVATED AND HIGH TEMPERATURES

0511063 - ÚFM 2020 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Stratil, Luděk - Šiška, Filip - Hadraba, Hynek - Fintová, Stanislava - Mrna, T. - Dlouhý, Ivo
THE EFFECT OF SPECIMEN SIZE FOR THE P91 STEEL AT ELEVATED AND HIGH TEMPERATURES.
PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2017, VOL 1A. New York: ASME, 2017 - (Crane, R.; Hojo, K.; Xu, S.; Cipolla, R.), č. článku V01AT01A068. ISBN 978-0-7918-5790-8.
[ASME 2017 - Pressure Vessels and Piping Conference. Waikoloa, Hawaii (US), 16.07.2017-20.07.2017]
Grant CEP: GA ČR GJ15-21292Y; GA MŠMT(CZ) LQ1601
Institucionální podpora: RVO:68081723
Klíčová slova: FRACTURE-TOUGHNESS * MASTER CURVE * Ductile fracture
Obor OECD: Audio engineering, reliability analysis

The contribution aims to evaluate fracture toughness of the P91 steel in the ductile regime. This steel is broadly used for applications for pressure vessels and piping systems. The J-R curves were obtained using 1T, 0.5T and 0.25T CT specimens at 23 degrees C and using 0.5T and 0.25T CT specimens up to 600 degrees C. The energy normalization method for the J-R curve determination according to the ASTM E1820 was used. The resistance to crack propagation shows temperature dependence and the dynamic strain ageing effect with minimum values at 400 degrees C. Both specimen sizes 0.5T and 0.25T give a similar trend of the temperature dependence of fracture toughness. However, the size effect is observed as fracture toughness decreases with the specimen size. The results obtained are compared with the results of other authors pointing the specimen size effect and the temperature dependence of the steel.
Trvalý link: http://hdl.handle.net/11104/0301421