ORCID Profile
0000-0002-0794-8836
Current Organisation
Advisian
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Publisher: Elsevier BV
Date: 08-2011
Publisher: IOP Publishing
Date: 05-1997
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 2013
DOI: 10.1016/J.MICRON.2012.08.007
Abstract: Surface cracking or heat-checking is investigated at a microscopic scale on a hot work tool steel (X38CrMoV5) tested under thermal fatigue. Thermal fatigue tests are periodically interrupted to observe the surface of the specimens by scanning electron microscopy (SEM). A non destructive and semi-automatic method is developed to assess and evaluate the two-dimensional crack pattern initiated on the oxide scale layer formed on the specimen surface. The crack pattern is characterized by image analysis in terms of density, morphological and topological features. This technique allows to determine the number of cycles to initiate the microscopic heat-checking and to follow its evolution.
Publisher: Walter de Gruyter GmbH
Date: 2008
Publisher: Elsevier BV
Date: 06-2013
Publisher: ASME International
Date: 22-05-2002
DOI: 10.1115/1.1421612
Abstract: The combined effect of the lattice friction and localized obstacles on the in idual dislocation velocity is considered. First the two effects are considered separately. The velocity of an in idual dislocation is described by the Hirth-Lothe equation for the case of lattice friction and by a power law for the case of localized obstacles. The power law is modified to introduce a static waiting time: the time a dislocation has to wait in its equilibrium configuration at an obstacle until it breaks away by virtue of thermal activation. As a next step, a combination of the two mechanisms is described. A dynamic waiting time is introduced: it corresponds to a situation when a dislocation overcomes the obstacle before it reaches the equilibrium configuration. The model provides a good description of the effects when they are independent, and also gives an interpolation of the two regimes. A simulation for a model material is proposed to illustrate the transition between the two regimes. This unified model is tested against experimental data for in-situ deformation of monocrystalline germanium in a transmission electron microscope. The purpose is to determine an equivalent power law exponent in a regime of plastic flow that does not follow a proper power law. The resolution is not complete because the strength of the localized obstacles is not known. However, the results are promising and allow a discussion relating to the strength of localized obstacles.
Publisher: Elsevier BV
Date: 02-2014
Publisher: Springer Science and Business Media LLC
Date: 08-02-2008
Publisher: Wiley
Date: 11-2007
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 11-2005
Publisher: Elsevier BV
Date: 03-2001
Publisher: IOP Publishing
Date: 06-08-2001
Publisher: Elsevier BV
Date: 11-2019
Publisher: Informa UK Limited
Date: 15-12-2005
Publisher: Elsevier BV
Date: 09-1998
Publisher: Springer Science and Business Media LLC
Date: 04-2008
Publisher: Elsevier BV
Date: 02-2019
Publisher: Inderscience Publishers
Date: 2008
Publisher: Inderscience Publishers
Date: 2008
Publisher: Elsevier BV
Date: 11-2011
Publisher: Elsevier BV
Date: 06-2006
Publisher: Elsevier BV
Date: 05-2005
Publisher: Springer Science and Business Media LLC
Date: 03-2004
Publisher: Springer Science and Business Media LLC
Date: 27-10-2009
Publisher: Springer Science and Business Media LLC
Date: 06-2007
Publisher: Elsevier BV
Date: 02-2009
Location: France
No related grants have been discovered for Gilles Dour.