Improve oxidation resistance at high temperature by nanocrystalline surface layer
Scientific Reports, ISSN: 2045-2322, Vol: 5, Issue: 1, Page: 13027
2015
- 27Citations
- 32Captures
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Example: if you select the 1-year option for an article published in 2019 and a metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019. If you select the 3-year option for the same article published in 2019 and the metric category shows 90%, that means that the article or review is performing better than 90% of the other articles/reviews published in that journal in 2019, 2018 and 2017.
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Metrics Details
- Citations27
- Citation Indexes27
- 27
- CrossRef18
- Captures32
- Readers32
- 32
Article Description
An interesting change of scale sequence occurred during oxidation of nanocrystalline surface layer by means of a surface mechanical attrition treatment. The three-layer oxide structure from the surface towards the matrix is Fe 3 O 4, spinel FeCr 2 O 4 and corundum (Fe,Cr) 2 O 3, which is different from the typical two-layer scale consisted of an Fe 3 O 4 outer layer and an FeCr 2 O 4 inner layer in conventional P91 steel. The diffusivity of Cr, Fe and O is enhanced concurrently in the nanocrystalline surface layer, which causes the fast oxidation in the initial oxidation stage. The formation of (Fe,Cr) 2 O 3 inner layer would inhabit fast diffusion of alloy elements in the nanocrystalline surface layer of P91 steel in the later oxidation stage, and it causes a decrease in the parabolic oxidation rate compared with conventional specimens. This study provides a novel approach to improve the oxidation resistance of heat resistant steel without changing its Cr content.
Bibliographic Details
Springer Science and Business Media LLC
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