Three dimensional observations and modelling of intergranular stress corrosion cracking in austenitic stainless steel

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Three dimensional observations and modelling of intergranular stress corrosion cracking in austenitic stainless steel

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Publication Article, peer reviewed scientific
Title Three dimensional observations and modelling of intergranular stress corrosion cracking in austenitic stainless steel
Author(s) Marrow, James T ; Babout, L ; Jivkov, Andrey ; Wood, Paul ; Engelberg, Dirk ; Stevens, Nicholas ; Withers, Philip J ; Newman, RC
Date 2006
English abstract
Stress corrosion cracking is a life-limiting factor in many components of nuclear power plant in which failure of structural components presents a substantial hazard to both safety and economic performance. Uncertainties in the kinetics of short crack behaviour can have a strong influence on lifetime prediction, and arise due both to the complexity of the underlying mechanisms and to the difficulties of making experimental observations. This paper reports on an on-going research programme into the dynamics and morphology of intergranular stress corrosion cracking in austenitic stainless steels in simulated light water environments, which makes use of recent advances in high resolution X-ray microtomography. In particular in situ, three dimensional X-ray tomographic images of intergranular stress corrosion crack nucleation and growth in sensitised austenitic stainless steel provide evidence for the development of crack bridging ligaments, caused by the resistance of non-sensitised special grain boundaries. In parallel a simple grain bridging model, introduced to quantify the effect of crack bridging on crack development, has been assessed for thermo-mechanically processed microstructures via statically loaded room temperature simulant solution tests and as well as high temperature/pressure autoclave studies. Thermo-mechanical treatments have been used to modify the grain size, grain boundary character and triple junction distributions, with a consequent effect on crack behaviour. Preliminary three-dimensional finite element models of intergranular crack propagation have been developed, with the aim of investigating the development of crack bridging and its effects on crack propagation and crack coalescence.
DOI http://dx.doi.org/10.1016/j.jnucmat.2006.02.042 (link to publisher's fulltext)
Host/Issue Journal of Nuclear Materials;1-3
Volume 352
ISSN 0022-3115
Pages 62-74
Language swe (iso)
Subject(s) Technology
Research Subject Categories::TECHNOLOGY
Note E-MRS 2005 Spring Meeting Symposium N on Nuclear Materials, Strasbourg , FRANCE, May 31 to June 2 2005
Handle http://hdl.handle.net/2043/4773 (link to this page)

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