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Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature

Abstract : 9-12%Cr creep-resistant ferritic-martensitic steels are candidates for structural components of Generation IV nuclear power plants. However, they are sensitive to softening during low cycle fatigue and creep-fatigue tests, which leads to the destabilisation of the tempered martensite microstructure, inducing a decrease in further creep resistance. To better understand the softening mechanisms in an ASTM Grade 92 steel during uniaxial deformation, tensile tests were carried out at 823 K, showing an extended and stable softening stage after some work-hardening. This behaviour may be due to mechanical instability (necking), damage or microstructural (grain size) evolution. Examination of fractured and non-fractured tensile specimens (metallography, macrohardness tests, SEM, TEM) suggests that the physical mechanisms responsible for softening are mainly grain size evolution and diffuse necking.
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Submitted on : Friday, August 28, 2009 - 4:07:10 PM
Last modification on : Wednesday, November 17, 2021 - 12:27:36 PM

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  • HAL Id : hal-00411745, version 1

Citation

Pierre-François Giroux, F. Dalle, Maxime Sauzay, G. Perez, I. Tournié, et al.. Mechanical and microstructural stability of P92 steel under uniaxial tension at high temperature. 2nd ECCC Creep conference, Apr 2009, Zurich, Switzerland. pp.477-487. ⟨hal-00411745⟩

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