Cailiao Baohu (Apr 2024)

Effect of Cr on the Microstructure and Corrosion Resistance of Fe-Cr-Si Ternary Alloys

  • ZHANG Xuefeng, LONG Haiyang, GUI Yongliang, HU Guiyuan, SONG Chunyan, JIANG Dehua, QIN Tieyu

DOI
https://doi.org/10.16577/j.issn.1001-1560.2024.0077
Journal volume & issue
Vol. 57, no. 4
pp. 47 – 55

Abstract

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In order to explore the effect of Cr element content on the microstructure and corrosion resistance of Fe Cr Si ternary alloys, SEM, XRD and other instruments were used to investigate the microstructure, hardness and corrosion behavior of three different Cr content Fe Cr Si alloys. The effects of the different Cr content on the microstructure, hardness and corrosion resistance of Fe-Cr-Si alloys materials were analyzed systematically. Results showed that the three kinds of Fe-Cr-Si alloys with various Cr content were composed of dendrites and interdendritic substrate. With the increase of Cr content, the Fe3Si phase between dendrites increased, and Fe-Cr solid solution phase was formed. Compared to Fe8Cr10Si alloy, the hardness of Fe16Cr10Si alloy reduced by 16%. The results of the 10%(mass fraction) HCl solution immersion corrosion test indicated that Fe8Cr10Si alloy with low Cr content had the most severe corrosion with deep corrosion pits appearing, and the sheet-like silicides in the corrosion pits failed to effectively prevent the alloy from being corroded. In general, the increase of solid solution Cr content was the main reason for the improvement of corrosion resistance of Fe-Cr-Si alloy.

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