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:10.16577/j.issn.1001-1560.2024.0077

Materials Protection >

2024 , Vol. 57 >Issue 4: 47 - 55

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0077

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

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(1. North China University of Science and Technology, Institute of Metallurgy and Energy, Tangshan 063210, China;
2. Technical Center, HBIS Tangshan Iron & Steel Group Co., Ltd., Tangshan 063600, China)

LONG Haiyang (1987-), Master, Senior Laboratory Technician, Research Focus: Metal Material Composition Design, Surface Coating Processing and Manufacturing, Tel.: 15632547955, E-mail: lhy@ncst.edu.cn

Received date: 2023-03-09

Revised date: 2023-04-02

Accepted date: 2023-04-20

Online published: 2024-04-30

Supported by

Hebei Province Outstanding Youth Science Foundation (E2019209473); Support Program for Hundred Outstanding Innovative Talents in Hebei Universities (III) (SLRC2019030); Hebei Province Talent Project Cultivation Funding Program (A201905010); North China University of Science and Technology-Hebei Province Graduate Students’ Innovation Ability Cultivation Funding Program(CXZZBS2024136); Basic Research Program of Basic Research Business Service for Provincial Universities in Hebei Province(JQN2023029)

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Abstract

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.

Key words： Fe-Cr-Si alloy; metallographicstructure; solid solution Cr; corrosion resistance

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ZHANG Xuefeng, LONG Haiyang, GUI Yongliang, HU Guiyuan, SONG Chunyan, JIANG Dehua, QIN Tieyu . Effect of Cr on the Microstructure and Corrosion Resistance of Fe-Cr-Si Ternary Alloys[J]. Materials Protection, 2024 , 57(4) : 47 -55 . DOI: 10.16577/j.issn.1001-1560.2024.0077

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