Title: CREEP-FATIGUE PROPERTIES OF GRADE 91 STEEL
Authors: POHJA RamiNURMELA AstaMOILANEN PHOLMSTROM BJORN
Citation: Advances in Materials Technology for Fossil Power Plants p. 679-689
Publisher: ASM International
Publication Year: 2014
JRC N°: JRC92465
ISBN: 978-1-62708-060-6
URI: https://books.google.nl/books?id=ErppBAAAQBAJ&pg=PA679&lpg=PA679&dq=Advances+in+Materials+Technology+for+Fossil+Power+Plants+-+CREEP-FATIGUE+PROPERTIES+OF+GRADE+91+STEEL&source=bl&ots=pGKYN_rbSs&sig=p5ll-KpQkborWdfn6IVb0Bu_vh0&hl=en&sa=X&ei=YQSQVKOTEIvyUu
http://publications.jrc.ec.europa.eu/repository/handle/JRC92465
Type: Articles in periodicals and books
Abstract: The creep-fatigue properties of modified 9Cr-1Mo (grade 91) steel have been investigated for the purpose of design in cyclic service. In this paper test results from creep-fatigue (CF) and low cycle fatigue (LCF) on grade 91 steel are reported. The tests performed on the high precision pneumatic loading system (HIPS) are in the temperature range of 550-600ºC, total strain range of 0.7-0.9% and with hold periods in both tension and compression. Curves of cyclic softening and stress relaxation are presented. The CF test results and results obtained from literature are also analysed using methods described in the assessment and design codes of RCC-MRx, R5 and ASME NH as well as by the recently developed Fii-model. It is shown that the number of cycles to failure for CF data can be accurately predicted by the simple Fii-model. The practicality in using the life fraction rule for presenting the combined damage is discussed and recommendations for alternative approaches are made.
JRC Directorate:Energy, Transport and Climate

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