| Numéro |
J. Phys. IV France
Volume 12, Numéro 8, September 2002
|
|
|---|---|---|
| Page(s) | 191 - 202 | |
| DOI | https://doi.org/10.1051/jp4:20020333 | |
J. Phys. IV France 12 (2002) Pr8-191
DOI: 10.1051/jp4:20020333
Influence of long term exposure to molten lead on the microstructure and mechanical behaviour of T91 steel
F. Gamaoun1, M. Dupeux1, V. Ghetta1, J.-L. Pastol2, C. Leroux2, S. Guerin2 and D. Gorse21 Laboratoire de Thermodynamique et Physico-Chimie Métallurgiques, CNRS/INPG/UJF, ENSEEG, BP. 75, 38402 Saint-Martin-d'Hères cedex, France
2 Centre d'Etudes de Chimie Métallurgique, CNRS, 15 rue Georges Urbain, 94407 Vitry-sur-Seine cedex, France
Abstract
Specimens of T91 9%Cr martensitic steel were exposed to molten lead at 525°C
under
controlled oxygen partial pressure, for durations ranging from 6 hours to one month. At low
oxygen
concentration, a thin chromium oxide layer is formed; under higher concentration, the oxide layer
becomes thicker and complex. Under all conditions in liquid lead, numerous porosities appear
after a
few days of exposure to lead in the sub-surface regions of the samples. From the residual
deflection
of bent samples, the stress relaxation is much faster in liquid lead than under gaseous atmosphere.
However, the tensile properties remain unchanged after one month ageing in lead.
© EDP Sciences 2002