SOFTENING AND RELAXATION OF GR.91 STEEL IN CREEP-FATIGUE CONDITIONS

1 JANOUŠEK Jaromír
Co-authors:
2,3 SAUZAY Maxime 4 POHJA Rami 5 HOLMSTRÖM Stefan
Institutions:
1 CVR – Research Centre Řež, Plzeň, Czech Republic, EU, jas@cvrez.cz
2 ZČU – University of West Bohemia, Faculty of Mechanical Engineering, Department of Material, Plzeň, Czech Republic, EU
3 CEA – The French Alternative Energies and Atomic Energy Commission, Saclay, France, EU
4 VTT – Technical Research Centre of Finland Ltd, Espoo, Finland, EU
5 JRC – Joint Research Centre, Petten, Netherlands, EU
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
536-541
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
19 views / 4 downloads
Abstract

The data presented here were obtained as part of the European FP7 MatISSE project to model the softening and relaxation behaviour of Grade 91 steel under creep-fatigue loading because this type of thermal loading is a major degradation mechanism in fast reactors. The supporting tests were focused on strain controlled low cycle fatigue tests with different strain amplitudes (εa = 0.45 %, 0.35 % and 0.25 %) and different tension hold times (1 and 12 hours) for temperature 600°C. The results were compared with results for 24 hour hold time from another testing laboratory (VTT). The results were evaluated with respect to the number of cycles, N, and also as a function of the cumulative plastic strain, p(N).

Keywords: Creep-Fatigue; softening; relaxation; P91
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