金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 83-87.DOI: 10.13251/j.issn.0254-6051.2022.08.013

• 材料研究 • 上一篇    下一篇

耐蚀软磁合金FeCr16中σ相的析出行为

胡耕辅1, 田玉新2, 朱银存2, 陆建生2, 王福明1   

  1. 1.北京科技大学 冶金与生态工程学院, 北京 100083;
    2.宝武特种冶金有限公司, 上海 200940
  • 收稿日期:2022-03-10 修回日期:2022-06-28 出版日期:2022-08-25 发布日期:2022-09-19
  • 通讯作者: 王福明,教授,E-mail:wangfuming@metall.ustb.edu.cn
  • 作者简介:胡耕辅(1998—),男,硕士研究生,主要研究方向为钢铁材料合金化、组织与性能,E-mail:15073618201@163.com。

Precipitation behavior of σ phase in FeCr16 corrosion resistant soft magnetic alloy

Hu Gengfu1, Tian Yuxin2, Zhu Yincun2, Lu Jiansheng2, Wang Fuming1   

  1. 1. School of Metallurgical and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
    2. Baowu Special Metallurgy Co., Ltd., Shanghai 200940, China
  • Received:2022-03-10 Revised:2022-06-28 Online:2022-08-25 Published:2022-09-19

摘要: 为研究耐蚀软磁合金FeCr16中σ相析出行为,利用热力学软件Thermo-Calc计算了该合金体系的平衡相转变图。根据热力学计算结果,通过光学显微镜(OM)、扫描电镜(SEM)和能谱仪(EDS)研究了时效处理温度以及Cr含量对耐蚀软磁合金FeCr16中σ相析出行为的影响,并对其磁性能进行了测试。热力学计算结果表明,在温度低于560 ℃时,合金中有σ相析出。试验结果表明,σ相在500 ℃时尺寸和析出量最大,合金的磁感应强度在500 ℃出现最小值,因此σ相的大量析出会降低合金的磁性能。Cr元素的偏析会促进合金中σ相的析出,随着Cr含量的增加,σ相析出温度范围、尺寸和析出量增大,析出位置由晶界扩展到晶内。

关键词: 耐蚀软磁合金FeCr16, 热处理, σ相, 磁性能

Abstract: In order to study the precipitation behavior of σ phase in the corrosion resistant soft magnetic alloy FeCr16, the equilibrium phase transition diagram was calculated by Thermo-Calc. According to the results of thermodynamic calculation, the effect of aging treatment temperature and Cr content on precipitation behavior of σ phase in the corrosion resistant soft magnetic alloy FeCr16 was investigated by means of optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS), and the magnetic properties of the alloy were tested. The thermodynamic calculation results show that when the temperature is lower than 560 ℃, there is precipitation of σ phase in the alloy. The results of heat treatment experiments show that the size and precipitation amount of the σ phase have the maximu values at 500 ℃, and the magnetic induction intensity of the alloy has a minimum value at 500 ℃, so the large amount of precipitation of σ phase will reduce the magnetic properties of the alloy. The segregation of Cr will promote the precipitation of σ phase in the alloy. With the increase of Cr content, the precipitation temperature range, size and quantity of σ phase increase, and the precipitation position extends from the grain boundary to the grain.

Key words: corrosion resistant soft magnetic alloy FeCr16, heat treatment, σ phase, magnetic property

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