Oxidation behavior of weld metal, HAZ and base metal regions in weldments of Cr-Mo steels
- Indira Gandhi Center for Atomic Research, Kalpakkam (India). Metallurgy Division
In the weldments of 2.25Cr-1Mo and 9Cr-1Mo ferritic steels, the regions with different microstructures were identified as weld metal, heat-affected zone (HAZ) and base metal. When exposed to high temperatures, the HAZ of 2.25Cr-1Mo steel and the weld crown region of 9Cr-1 Mo steel were found to oxidize at higher rates, and develop much thicker scale than other regions in the weldments of the respective steels. SEM/EDS point analyses and SIMS depth profiles indicate that the scale over the regions showing inferior oxidation resistance are considerably less in free chromium content. The difference in the oxidation behavior of the different regions was found to arise from the difference in the Cr content of the inner layer of the protective oxide. Possible remedial measures to minimize the high oxidation rates in certain regions of the weldments of the two steels are also discussed.
- OSTI ID:
- 42850
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 4 Vol. 74; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Role of microstructural degradation in the heat affected zone of 2.25Cr-1Mo steel weldments on subscale features during steam oxidation and their role in weld failures
Soft zone formation in dissimilar welds between two Cr-Mo steels