The Unified Creep-Fatigue Equation for Stainless Steel 316

Background-The creep-fatigue properties of stainless steel 316 are of interest because of the wide use of this material in demanding service environments, such as the nuclear industry. Need-A number of models exist to describe creep-fatigue behaviours, but they are limited by the need to obtain spec...

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Bibliographic Details
Published in:Metals (Basel ) 2016-09, Vol.6 (9), p.219-219
Main Authors: Liu, Dan, Pons, Dirk John, Wong, Ee-hua
Format: Article
Language:English
Subjects:
Austenitic stainless steels
Creep (materials)
Creep fatigue
creep-rupture
Ductility
fatigue model
Fatigue tests
Mathematical analysis
Mathematical models
Metal fatigue
Nuclear energy
Nuclear power plants
Rupture tests
Stainless steel
Stainless steels
Strain hardening
unified equation
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Summary:Background-The creep-fatigue properties of stainless steel 316 are of interest because of the wide use of this material in demanding service environments, such as the nuclear industry. Need-A number of models exist to describe creep-fatigue behaviours, but they are limited by the need to obtain specialized coefficients from a large number of experiments, which are time-consuming and expensive. Also, they do not generalise to other situations of temperature and frequency. There is a need for improved formulations for creep-fatigue, with coefficients that determinable directly from the existing and simple creep-fatigue tests and creep rupture tests. Outcomes-A unified creep-fatigue equation is proposed, based on an extension of the Coffin-Manson equation, to introduce dependencies on temperature and frequency. The equation may be formulated for strain as [straight epsilon] p = C 0 c ( T , t , [straight epsilon] p ) N - β 0 , or as a power-law [straight epsilon] p = C 0 c ( T , t ) N - β 0 b ( T , t ) . These were then validated against existing experimental data. The equations provide an excellent fit to data (r2 = 0.97 or better). Originality-This work develops a novel formulation for creep-fatigue that accommodates temperature and frequency. The coefficients can be obtained with minimum experimental effort, being based on standard rather than specialized tests.
ISSN:2075-4701
2075-4701
DOI:10.3390/met6090219