Fe-Nb-Si三元体系相平衡研究

doi:10.19976/j.cnki.43-1448/TF.2021086

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Abstract Because of high coercivity, low permeability and large resistivity, silicon steel is widely used in the manufacture of iron core materials for transformers and various motors. On the basis of silicon steel, the addition of Nb element can improve the electromagnetic properties of silicon steel, and at the same time refine the grains and improve its mechanical properties. The research and application of Fe-Nb-Si ternary alloy is based on the study of ternary phase diagram. X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA/WDS) were used to analyze the Fe-Nb-Si ternary system at 1 173 K and 1 073 K. The following phase equilibrium was experimentally investigated. The results show that 11 three-phase equilibrium zones are measured at two temperatures, and three ternary compounds τ₂(FeSi₂Nb₂)、τ₅(Fe₄Si₇Nb₄)、τ₆(FeSiNb)are found. Themaximum solid solubility of Nb in η phase (Fe₅Si₃) is about 1.6% (mole fraction, %, the same below) at 1 173 K and 0.5% at 1 073 K. The maximum solid solubility of Fe in αNb₅Si₃ is about 5.8%at 1 173 K and 4.9% at 1 073 K. The maximum solid solubility of Si in Fe₂Nb is 24.3% at 1 173 K and 25.2% at 1 073 K. The maximum solid solubility of Si in μ phase (FeNb) is up to 13.4% Si at 1 173 K and only about 11.3% at 1 073 K. This work improves the phase diagram information of the Fe-Nb-Si ternary system and provides a theoretical basis for the subsequent development of new silicon steel.

Key words： Fe-Nb-Si system phase equilibrium solid solubility isothermal cross section

Received: 22 October 2021 Published: 28 February 2022

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TG113.14

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	NIE Yusong
	WEN Andong
	ZHANG Ligang
	DENG Zixuan
	LIU Libin

Cite this article:

NIE Yusong,WEN Andong,ZHANG Ligang, et al. Phase equilibrium investigation of the Fe-Nb-Si ternary system[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(1): 13-23.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2021086 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I1/13

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