Influence of creep deformation on the corrosion behaviour of a CeO(2) surface modified alloy 800H in a sulphidising/oxidising/carburising environment
The corrosion behaviour of a CeO(2) surface modified pre-oxidised wrought austenitic steel of the type Fe-20Cr-32Ni (Alloy 800H) is studied in a simulated coal gasification atmosphere at 700 C for exposure times up to 3000 h. The influence of creep deformation on the corrosion resistance of this material is assessed by comparison with its behaviour in the stress-free condition. The significant improvement in the corrosion resistance of Alloy 800H due to the CeO(2) treatment can be decreased by creep deformation. Both strain and strain rate govern the cracking behaviour of the pre-formed protective oxide layer, leading to enhanced internal and external attack. The pre-formed oxide layer tends to rupture at a lower strain with increasing strain rate. In contrast to oxidising environments, no healing of the oxide is observed under the applied testing conditions. In this case, the protectiveness of the oxide scale is determined by its ductility.
Bibliographic Reference: Paper presented: 2nd International Symposium on High Temperature Corrosion of Advanced Materials and Coatings, Les Embiez (FR), May 22-26, 1989
Availability: Available from (1) as Paper EN 34818 ORA
Record Number: 198910614 / Last updated on: 1994-12-01
Original language: en
Available languages: en