Abstract
The microstructure of an alumina-forming austenitic stainless steel with a composition design of Fe-18Ni-16Cr-4Al-2Mo-0.4 Nb (in wt%) is characterized. The steel contains about 75 vol% austenitic phase and 25 vol% ferritic phase. B2-NiAl precipitates with round shape can be found only in the ferritic phase in the as-rolled sample. The corrosion behavior in static liquid lead with different oxygen content of 10−9 and 10−6% by mass at 700 °C for 1000 h is investigated. After exposure for 1000 h in liquid lead with oxygen content of 10−9%, obvious lead penetration combined with nickel dissolution is found. In the case of liquid lead with 10−6% oxygen content, a thin oxide layer can be formed on the surface, thus protecting the steel from liquid lead attack. After the corrosion test, significant precipitations are found in both austenitic and ferritic phases in the matrix of the steel.
Highlights
10 February 2020The steel contains about 75 vol% austenitic this work must maintain attribution to the phase and 25 vol% ferritic phase
In the near future, a number of advanced energy systems will operate at a rather high temperature level in order to improve the thermal efficiency and decrease the CO2 emission
One purpose of this work is to investigate the effect of oxygen content in liquid lead on the corrosion behavior of the alumina-forming austenitic (AFA) steel, two tests were performed in liquid lead with different dissolved oxygen concentrations at 700 °C, and the exposure time are all set at 1000 h
Summary
The steel contains about 75 vol% austenitic this work must maintain attribution to the phase and 25 vol% ferritic phase. B2-NiAl precipitates with round shape can be found only in the author(s) and the title of ferritic phase in the as-rolled sample. The corrosion behavior in static liquid lead with different oxygen the work, journal citation and DOI. After exposure for 1000 h in liquid lead with oxygen content of 10−9%, obvious lead penetration combined with nickel dissolution is found. In the case of liquid lead with 10−6% oxygen content, a thin oxide layer can be formed on the surface, protecting the steel from liquid lead attack. Significant precipitations are found in both austenitic and ferritic phases in the matrix of the steel
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