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

doi:10.13251/j.issn.0254-6051.2022.08.013

Abstract

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

CLC Number:

TG113

Hu Gengfu, Tian Yuxin, Zhu Yincun, Lu Jiansheng, Wang Fuming. Precipitation behavior of σ phase in FeCr16 corrosion resistant soft magnetic alloy[J]. Heat Treatment of Metals, 2022, 47(8): 83-87.

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