NDLI: High temperature creep-fatigue design

Content Provider	Springer Nature Link
Author	Tavassoli, A. A. F. Fournier, B. Sauzay, M.
Copyright Year	2010
Abstract	Generation IV fission and future fusion reactors envisage development of more efficient high temperature concepts where materials performances are key to their success. This paper examines different types of high temperature creep-fatigue interactions and their implications on design rules for the structural materials retained in both programmes. More precisely, the paper examines current status of design rules for the stainless steel type 316L(N), the conventional Modified 9Cr-1Mo martensitic steel and the low activation Eurofer steel. Results obtained from extensive high temperature creep, fatigue and creep-fatigue tests performed on these materials and their welded joints are presented. These include sequential creep-fatigue and relaxation creep-fatigue tests with hold times in tension, in compression or in both. Effects of larger plastic deformations on fatigue properties are studied through cyclic creep tests or fatigue tests with extended hold time in creep. In most cases, mechanical test results are accompanied with microstructural and fractographic observations. In the case of martensitic steels, the effect of oxidation is examined by performing creep-fatigue tests on identical specimens in vacuum. Results obtained are analyzed and their implications on design allowables and creep-fatigue interaction diagrams are presented. While reasonable confidence is found in predicting creep-fatigue damage through existing code procedures for austenitic stainless steels, effects of cyclic softening and coarsening of microstructure of martensitic steels throughout the fatigue life on materials properties need to be taken into account for more precise damage calculations. In the long-term, development of ferritic/martensitic steels with stable microstructure, such as ODS steels, is proposed.
Starting Page	235
Ending Page	244
Page Count	10
File Format	PDF
ISSN	09722815
Journal	Transactions of the Indian Institute of Metals
Volume Number	63
Issue Number	2-3
e-ISSN	09751645
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-11-23
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Creep-fatigue design mod. 9Cr-1Mo steel microstructural degradation Tribology, Corrosion and Coatings Materials Science Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys

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