Open Access Peer-reviewed Research Article

Corrosion of austenitic Fe-Ni based alloys with various chromium and aluminum additions in a carburizing-oxidizing atmosphere at 800ᐤC

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Submitted   Feb 3, 2024
Published   Apr 17, 2024
Issue    Vol 6 No 1 (2024)
DOI   10.25082/MER.2024.01.002

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Shu Liu
Industrial Training Centre, Shenzhen Polytechnic University, Shenzhen 518000, China
Yong Zhu
Industrial Training Centre, Shenzhen Polytechnic University, Shenzhen 518000, China
JunJie Cao corresponding author
Industrial Training Centre, Shenzhen Polytechnic University, Shenzhen 518000, China

Abstract

The corrosion behaviors of Fe-19Ni-13/21Cr-xAl (x = 0, 2, 6 at. %) alloys in a carburizing-oxidizing atmosphere were compared with those in a purely carburizing atmosphere at 800oC. For alloys with 13 at. % Cr, 2 at. % addition of Al did not improve the corrosion resistance effectively but induced a slightly increase of the total mass gain. 6 at. % addition of Al produced a large decrease of the total mass gain, therefore the corrosion resistance was improved significantly. For alloys with 21 at. % Cr, additions of Al did not affect the total mass gain obviously. Fe-19Ni-21Cr-xAl (x = 0, 2, 6 at. %) showed similar mass gain. Increase of Cr content from 13 at. % to 21 at. % is effective for protecting the alloys from the carbon attack for Al-free alloys and alloys with 2 at. % Al. However, addition of Cr is not so helpful for alloys with 6 at. % Al. The addition of oxygen improved the corrosion resistance of all alloys significantly except the Fe-19Ni-13Cr-6Al. Pure external chromia scales on alloys without Al and with 2 at. % Al could not suppress the inward diffusion of the carbon atoms. Aluminum and chromium worked together to form mixed oxide scales inhibiting the carbon attack totally on alloys with 6 at.% Al.

Keywords
carburization, Fe-Ni-Cr-Al, alumina, chromia, oxidation

Article Details

Supporting Agencies
This work was financially supported by NSFC (Grant No. 51801026 and 51671203), the Foundation for Young Talents of Shenzhen Polytechnic (Grant No. 601822K35018), Foundation for Young Talents in Higher Education of Guangdong (Grant No. 601821K35055).
How to Cite
Liu, S., Zhu, Y., & Cao, J. (2024). Corrosion of austenitic Fe-Ni based alloys with various chromium and aluminum additions in a carburizing-oxidizing atmosphere at 800ᐤC. Materials Engineering Research, 6(1), 313-322. https://doi.org/10.25082/MER.2024.01.002
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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