The creep rupture behaviour and steam oxidation resistance of P92 weldments

The creep rupture properties of P92 autogenous welds have been investigated using cross-weld specimens and weld simulation specimens. The influence of post-weld heat treatment was also examined. The results have shown that the weldments in creep rupture tests failed in the softened heat affected zon...

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Bibliographic Details
Published in:Materials at high temperatures 2006-01, Vol.23 (3-4), p.187-193
Main Author: Ennis, P.J.
Format: Article
Language:English
Subjects:
creep rupture behaviour
P92 weldments
steam oxidation resistance
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Summary:The creep rupture properties of P92 autogenous welds have been investigated using cross-weld specimens and weld simulation specimens. The influence of post-weld heat treatment was also examined. The results have shown that the weldments in creep rupture tests failed in the softened heat affected zone (Type IV failure). Transmission electron microscopy of thin foils taken from the heat affected zone revealed a low dislocation density, which is associated with the low creep rupture strength. The stress rupture strength reduction factor of the weldments compared with the base material is, however, within acceptable limits. Steam oxidation tests were carried out on the weld deposit and on cross-weld specimens and showed that the weldments exhibited lower oxidation rates than the parent material, due to the higher Si and Mn contents of the filler metal.
ISSN:0960-3409
1878-6413
DOI:10.1179/mht.2006.013