无取向硅钢中硫化物的析出机理

doi:10.11896/cldb.20060166

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Abstract The precipitation mechanism of sulfide and the effect of sulfide on grain growth during annealing in non-oriented silicon steel were systematically studied based on the calculation of thermodynamics and kinetics, combined with scan electron microscopy (SEM) and transmission electron microscopy (TEM). The results indicate that sulfides in non-oriented silicon steel are mainly (Mn,Cu)S composite precipitates. In the solidification process, MnS and Cu₂S would not possess the precipitation thermodynamic conditions. MnS would preferentially nucleate at grain boundaries before Cu₂S, and dislocation nucleation will dominate as the temperature decreases. In the soaking process, MnS in w(Si+Al)≥2.5% non-oriented silicon steel and Cu₂S in w(Si+Al)≤1.6% non-oriented electrical steel are mainly nucleated at the grain boundary. Meanwhile, during the soaking process the precipitation amount of MnS is much larger than that of Cu₂S in the grain boundary, and Cu₂S would mainly precipitate in the subsequent heat treatment processes. Ostwald ripening calculations of MnS and Cu₂S show that the effect of MnS and Cu₂S in w(Si+Al)≥2.5% non-oriented silicon steel on grain growth is significantly greater than that of w(Si+Al)≤1.6% non-oriented electrical steel.

Key words： non-oriented silicon steel sulfide precipitation mechanism nucleation

Published: 12 November 2021

CLC number:

TF4

Fund:National Key Research and Development Plan (2016YFB0300305).

Corresponding Authors: qiustchina@126.com

About author:: Jialong Qiao, Ph.D. student of National Engineering Research Center of Continuous Casting Technology, China Iron & Steel Research Institute Group, focusing on the research of silicon steel quality improvement, process optimization and theories.
Shengtao Qiu, senior engineer of National Engineering Research Center of Continuous Casting Technology, China Iron & Steel Research Institute Group, mainly engaged in research and development of basic theory and technology of metallurgical materials technology, including mathematical simulation of metallurgical processes, application of electromagnetic technology in continuous casting process, homogenization of conti-nuous casting billet and quality control of casting billet, high-quality steel (electrical steel, pressure vessels, ship plates, etc.) production technology.

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	QIAO Jialong
	GUO Feihu
	FU Bing
	HU Jinwen
	XIANG Li
	QIU Shengtao

Cite this article:

QIAO Jialong,GUO Feihu,FU Bing, et al. Precipitation Mechanism of Sulfide in Non-oriented Silicon Steel[J]. Materials Reports, 2021, 35(20): 20106-20112.

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http://www.mater-rep.com/EN/10.11896/cldb.20060166 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20106

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