金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 77-82.DOI: 10.13251/j.issn.0254-6051.2022.08.012

• 材料研究 • 上一篇    下一篇

Si含量对Fe-Cr-Si系合金组织与耐蚀性能的影响

秦铁玉1, 宋春燕1,2, 马汝成1, 张学峰1, 郝威1, 贵永亮1,2   

  1. 1.华北理工大学 冶金与能源学院, 河北 唐山 063210;
    2.华北理工大学 唐山市特种冶金及材料制备重点实验室, 河北 唐山 063210
  • 收稿日期:2022-03-11 修回日期:2022-06-15 出版日期:2022-08-25 发布日期:2022-09-19
  • 通讯作者: 贵永亮,教授,博士,E-mail:gyl@ncst.edu.cn
  • 作者简介:秦铁玉(1996—),男,硕士研究生,主要研究方向为金属材料制备与性能,E-mail:1097629485@qq.com。
  • 基金资助:
    河北省杰出青年科学基金(E2019209473);河北省高校百名优秀创新人才支持计划(III) (SLRC2019030);河北省人才工程培养项目(A201905010)

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

Qin Tieyu1, Song Chunyan1,2, Ma Rucheng1, Zhang Xuefeng1, Hao Wei1, Gui Yongliang1,2   

  1. 1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan Hebei 063210, China;
    2. Tangshan Key Laboratory of Special Metallurgy and Material Preparation, North China University of Science and Technology, Tangshan Hebei 063210, China
  • Received:2022-03-11 Revised:2022-06-15 Online:2022-08-25 Published:2022-09-19

摘要: 利用电弧熔炼工艺制备了不同Si含量(6wt%、8wt%、10wt%、12wt%)的Fe-Cr-Si系合金,系统研究了Si含量对Fe-Cr-Si系合金组织和耐腐蚀性能的影响。结果表明,4种不同Si含量的Fe-Cr-Si合金均由初生树枝晶和枝晶间基体组成,Si含量的增加促进了合金中金属硅化物Fe3Si的形成。Fe-Cr-Si系合金在10%HCl中均表现出良好的耐蚀性能,浸泡72 h后合金表面形成的SiO2具有钝化作用,且Si含量的增加可以显著提高合金的耐蚀性能,当Si含量达到12%时,耐蚀能力为2Cr13不锈钢的26倍。

关键词: Fe-Cr-Si系合金, 显微组织, 金属硅化物, 腐蚀

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

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