The corrosion behaviour of the ODS alloy MA 956 in O-S-C bearing gases at 600 C under deformation
The ODS alloy MA 956 (20 % Cr, 4.5 % Al, 0.5 % Ti, 0.5 % Y(2)O(3), Bal.Fe) is well known to behave very satisfactorily in sulphur-bearing atmospheres even at relatively low oxygen potentials. This is due to the development of alumina scale. A further improvement of the corrosion resistance appears to be possible by the formation of a protective oxide scale by pre-oxidation. Although very acceptable corrosion behaviour of MA 956 is observed for the stress free condition, the question arises in how far superimposed deformation will cause degradation of the corrosion resistance. The present work deals with the influence of creep on the corrosion of MA 956 in the pre-oxidised condition in a gas mixture with oxygen and sulphur potentials of about 2 x 1.0 E-26 and 7 x 1.0 E-11 bar, respectively, at 600 C. Weight gain measurements for exposure times up to 6000 hours and structural analysis have been carried out on selected specimens.
Bibliographic Reference: Paper presented: Materials for Power Engineering Components, Jülich (DE), October 13-14, 1992
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Record Number: 199310112 / Last updated on: 1994-11-29
Original language: en
Available languages: en