Precipitation of Second Phase in Non-oriented Silicon Steel

doi:10.11901/1005.3093.2021.634

Chinese Journal of Materials Research

2023, Vol. 37

Issue (1): 47-54 DOI: 10.11901/1005.3093.2021.634

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Precipitation of Second Phase in Non-oriented Silicon Steel

XU Yang¹, LI Yanrui¹, LIU Baosheng¹(

), LIU Wen¹, ZHANG Shaohua¹, WEI Yinghui¹^,²

^1.College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
^2.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024, China

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XU Yang, LI Yanrui, LIU Baosheng, LIU Wen, ZHANG Shaohua, WEI Yinghui. Precipitation of Second Phase in Non-oriented Silicon Steel. Chinese Journal of Materials Research, 2023, 37(1): 47-54.

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Abstract

The precipitation behavior of second phase in non-oriented silicon steel during normalization treatment at 900~1000℃ was investigated by means of scanning electron microscope (SEM) observation and energy dispersive spectrometer (EDS), and thermodynamic and kinetic calculations. The result show that the second phases in non-oriented silicon steel are mainly AlN with a small amount of MnS. The critical nucleation radius (d*) of AlN and MnS particles increases with the increase of precipitation temperature for different matrix phases, namely α-phase, γ-phase and (α+γ) two-phase respectively, which accord with three different precipitation nucleation mechanisms i.e. uniform nucleation, grain boundary nucleation and dislocation nucleation. By taking the second phase nucleation behavior at the same temperature as comparison, among others the critical nucleation work of grain boundary nucleation of AlN is the smallest, the relative nucleation rate is the largest, so grain boundary nucleation is easy to occur in (α+γ) two-phase area. Besides, the critical nucleation radius of MnS on the dislocation line is the smallest, the relative nucleation rate is large, and the initial precipitation temperature is low, therefore, the dislocation nucleation is dominated for MnS precipitates in the α-phase matrix.

Key words: metallic materials non-oriented silicon steel second phase heat treatment thermodynamics dynamics

Received: 11 November 2021

ZTFLH:

TG142.7

Fund: Major Science and Technology Projects in Shanxi Province(20191102004);Key R & D Plan Projects in Shanxi Province(202003D111001);Key R & D Plan Projects in Shanxi Province(201903D111008)

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	Yang XU
	Yanrui LI
	Baosheng LIU
	Wen LIU
	Shaohua ZHANG
	Yinghui WEI

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.634 OR https://www.cjmr.org/EN/Y2023/V37/I1/47

Table 1 Chemical composition of non oriented silicon steel (mass fraction, %)

Table 2 Equilibrium solid solubility product formula of AlN and MnS in different phases

Fig.1 Morphology of inhibitor particles in normalized plate and EDS energy spectrum analysis (a) Single AlN particles into the grain, (b) Single AlN particles at grain boundaries, (c) Superimposed lamellar AlN, (d) AlN-MnS composite precipitates, (e) EDS of AlN particles, (f) EDS of AlN-MnS particles

Fig.2 Fe-Si binary phase diagram and temperature control

Fig.3 Equilibrium precipitation amount of the AlN and MnS particles in different matrix phases

Table 3 Equilibrium precipitation amount of the AlN and MnS at different normalization temperatures

Fig.4 Critical nucleation size (d*) of the AlN (a) and MnS (b) under different nucleation mechanisms

Fig.5 Critical nucleation energy of AlN and MnS, under different nucleation mechanisms (a) (ΔG*), (b) enlarged area of the red box, (c) (ΔG*), (d) is the enlarged area of the red box

Fig.6 Relative nucleation rate of the AlN (a) and relative nucleation rate of the MnS (b) under different nucleation mechanisms

Fig.7 PTT curve of AlN (a) and PTT curve of MnS (b) under different nucleation mechanisms

Table 4 Fastest precipitation temperatures of AlN and MnS with three different nucleation mechanisms

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