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A multi-level model for the analysis and prediction of creep and creep fracture of 2.25Cr–1Mo steel tubes / Mark Evans

Materials Science and Engineering: A, Volume: 528, Issue: 1, Pages: 500 - 512

Swansea University Author: Mark Evans

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Abstract

The creep and creep rupture properties of 2.25Cr–1Mo steel tubes have been analysed using the Wilshire equations. The observed behaviour patterns are then discussed in terms of the dislocation processes governing creep strain accumulation. A suitable statistical framework for analysing both the sing...

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Published in: Materials Science and Engineering: A
ISSN: 0921-5093
Published: 2010
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URI: https://cronfa.swan.ac.uk/Record/cronfa5455
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Abstract: The creep and creep rupture properties of 2.25Cr–1Mo steel tubes have been analysed using the Wilshire equations. The observed behaviour patterns are then discussed in terms of the dislocation processes governing creep strain accumulation. A suitable statistical framework for analysing both the single and multi batch data available on this material is then specified. It is shown that ignoring the hierarchical nature present in many creep data bases, which has been the approach until now when using the Wilshire equations, leads to a serious and significant underestimate of the predicted safe life for this material. The model allows accurate predictions of long-term properties by extrapolation of short-term results for this steel.
Item Description: Current Impact Factor = 2.1. Five Year Impact Factor = 2.3This paper is concerned with a subject of considerable practical importance as the steel, on which the data is analysed and predictions are made, is widely employed in existing power plants. This is a very timely paper as it shows for the first time the extent of confidence that can be placed on predictions of the service life of components made from this material made using the new Wilshire methodology .
Keywords: Creep; Fracture; Multi level models; Bainitic Steels
College: College of Engineering
Issue: 1
Start Page: 500
End Page: 512