Matériaux & Techniques
Volume 83, 1995Matériaux intelligents. Corrosion sous contrainte. Essai de dureté
|Page(s)||48 - 50|
|Published online||21 June 2017|
V - Fragilisation par l’hydrogène de l’acier inoxydable duplex Z2CND2205 chargé en hydrogène à 200°C
Hydrogen embrittlement of duplex stainless steel Z2CND2205 hydrogen charged at 200°C
Ageing the duplex stainless steel below 500°C, the main and usually phenomenon is the unmixing of the δ-FeCr solid solution by spinodal decomposition (or precipitation of α‘-Cr at higher temperatures). Various intermetallics are detected such as fine dispersed (Ni, Si, Mo-rich) G-phase.
At higher ageing temperatures (between 600°C and 1050°C), a variety of secondary phases may form, such as γ2, σ R χ and Π. The precipitation of carbides M23C6, M7C2 and Cr2N are also detected.
This paper is devoted to study the interactions between hydrogen atoms and these phases in a 2205 duplex steel. Hydrogenation had been achieved at 200°C in a molten salts bath, during 3 hours (tempering time also) with an applied cathodic potential equal to -1.5 V/Ag/AgCl. After hydrogen charging, samples have been out- gassed under vacuum at 600°C to measure the quantity of hydrogen QH. The ageing temperature was varied between 200°C and 1050°C. The hydrogen embrittlement factor was determined by performing 10-6 s-1 tensile tests at room temperature.
The results show that the variation of U.T.S. is sensitive to the microstructure change in absence and in presence of hydrogen. The relationship between λ (U.T.S.Hyd/U.T.S.Air) and QH is linear; λ is low (i.e. high embrittlement) in presence of a phase with low QH level, while, in presence of the other phases, even with high QH, λ is relatively high (low embrittlement).
© SIRPE 1995
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