Performance improvement and microstructure evolution of powder metallurgy high silicon steel with phosphorus addition

ABSTRACT

In this study, phosphorus-containing Fe-5 wt.% Si silicon steel sheet was prepared by powder loose sintering followed by hot rolling. Defect-free sheet with high P content was achieved. The study found that P effects on sintering promotion and processing deterioration were significantly suppressed by the presence of Si in steel. Appropriate P content would significantly improve the mechanical and magnetic properties of the sample. Under a comprehensive consideration, P content of 0.3-0.5 wt.% was suitable for silicon steel. Compared with P-free silicon steel, with 0.3 wt.% P addition, the tensile strength of silicon steel increased from 521 MPa to 680 MPa. As to the magnetic performance, the sample with 0.5 wt.% P had B8 of 1370.5 mT, and W10/50 0f 1.16 W·kg⁻¹, while those for P-free sample were 1332.3 mT, and 1.46 W·kg⁻¹, respectively. FeP phase with special morphology would be precipitated in samples with P addition.

KEYWORDS:

• Silicon steel
• phosphorus
• loose powder sintering
• performance
• FeP phase

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China [grant numbers 52004027, U21A200305], the Fundamental Research Funds for the Central Universities [grant number FRF-GF-19-034B], and the Scientific and Technological Innovation Foundation of Foshan, USTB [grant number BK21BE001].

Notes on contributors

Qian Qin

Qian Qin is Ph.D. candidate in Engineering at the University of Science and Technology Beijing. She is engaged in the researches on powder metallurgy iron-based materials.

Fang Yang

Fang Yang is a Ph.D. in Engineering and works as an associate professor at the University of Science and Technology Beijing. Her research interests include powder metallurgy titanium and titanium alloys, aluminum and aluminum alloys, copper and copper alloys, 3D printing, iron-based alloys, self-propagating high temperature synthesis (SHS), and magnetic materials.

Cunguang Chen

Cunguang Chen is a Ph.D. in Engineering and works as lecturer at the University of Science and Technology Beijing. His research interests include powder metallurgy titanium and titanium alloys, aluminum and aluminum alloys, copper and copper alloys, and other advanced powder metallurgy technologies and materials.

Junjie Hao

Junjie Hao is a Professor and PhD supervisor working at the University of Science and Technology Beijing. He is an expert in powder metallurgy ceramic materials, ironbased alloys, radio frequency inductively coupled plasma spheroidization technology, and advanced powder metallurgy technologies and materials.

Zhimeng Guo

Zhimeng Guo is a Professor and PhD supervisor working at the University of Science and Technology Beijing. He is an expert in powder metallurgy titanium and titanium alloys, aluminum and aluminum alloys, copper and copper alloys, 3D printing, ironbased alloys, dispersion strengthened materials, radio frequency inductively coupled plasma spheroidization technology, selfpropagating high temperature synthesis (SHS), advanced powder metallurgy technologies and materials.