Effect of Ce on oxidation behaviour and microstructure evolution of a nickel-saving austenitic heat-resistant cast steel

•Addition of Ce enhances the selective oxidation of Cr.•Addition of Ce facilitates the release of stress in the oxide scale.•Addition of Ce hinders the removal of Mn to retard transformation of γ- to α-iron. The effect of Ce on the oxidation behaviour and microstructure evolution of nickel-saving au...

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Bibliographic Details
Published in:Corrosion science 2020-04, Vol.166, p.108423, Article 108423
Main Authors: Liu, Tianlong, Zheng, Kaihong, Wang, Juan, Lin, Yingfei, Zheng, Zhibin, Long, Jun
Format: Article
Language:English
Subjects:
Alloying elements
Austenitic heat-resistant cast steel
Austenitic stainless steels
Cerium
Depletion
Evolution
Heat resistant steels
Manganese
Microstructure
Microstructure evolution
Nickel
Oxidation
Oxidation behaviour
Oxidation resistance
Oxidation tests
Substrates
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Summary:•Addition of Ce enhances the selective oxidation of Cr.•Addition of Ce facilitates the release of stress in the oxide scale.•Addition of Ce hinders the removal of Mn to retard transformation of γ- to α-iron. The effect of Ce on the oxidation behaviour and microstructure evolution of nickel-saving austenitic heat-resistant cast steel in air at 900 °C was investigated by performing the isothermal oxidation tests. After 200 h of oxidation, the oxidation resistance of Ce-containing steel was about 20 % higher than that of Ce-free steel. In addition to its role as a reactive element, alloyed Ce slowed the rate of manganese depletion from the substrate and subsurface ferrite formation, leading to the improvement of the oxidation resistance of Ce-containing steel.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108423