Oxidation behaviors of Fe-25Cr-20Ni-χNb austenitic weld metals at 1100 °C in ambient air: Role of elemental niobium
Source abstract
Abstract
Abstract The isothermal oxidation behaviors of the Fe-25Cr-20Ni-χNb (0–1.6 wt.%) weld metals have been investigated in air at 1100 °C. Results showed that niobium has a detrimental effect on the elevated temperature oxidation resistance of the chromia-forming weld metals. In the Nb content range studied, the Nb content of 1.6 wt.% showed the most deleterious effect on the chromia layer. Niobium promoted the chromium depletion underneath the oxide/matrix interface by impeding the chromium diffusion, which ruined the compactness of the chromia layer. The oxidation of niobium at the oxide layer/metal interface can further cause severe damage to the chromia layer, resulting in catastrophic oxide spallation.
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Research context
OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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