Effect of Si content on microstructure and corrosion resistance of Fe-Cr-Si alloy

doi:10.13251/j.issn.0254-6051.2022.08.012

Abstract

Abstract: Four Fe-Cr-Si alloys with different Si contents (6wt%, 8wt%, 10wt% and 12wt%) was designed and prepared by arc furnace process, and the effect of Si content on microstructure and corrosion resistance of Fe-Cr-Si alloys was investigated. The results show that the Fe-Cr-Si alloys with different Si contents are composed of primary dendrite and interdendrite matrix, and formation of metal silicide Fe₃Si in microstructure is promoted with the increase of Si content. The Fe-Cr-Si alloys show good corrosion resistance in 10% HCl. After soaking for 72 h, SiO₂ formed on the surface of the alloy has passivation effect, and the increase of Si content can significantly improve the corrosion resistance of the alloy. When the Si content reaches 12%, the corrosion resistance is 26 times that of 2Cr13 stainless steel.

Key words: Fe-Cr-Si alloy, microstructure, metal silicide, corrosion

CLC Number:

TG174

Qin Tieyu, Song Chunyan, Ma Rucheng, Zhang Xuefeng, Hao Wei, Gui Yongliang. Effect of Si content on microstructure and corrosion resistance of Fe-Cr-Si alloy[J]. Heat Treatment of Metals, 2022, 47(8): 77-82.

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