Abstract
Based on conventional hot rolling processes and strip casting processes, Cu precipitation strengthening is used to improve the strength of non-oriented silicon steel in order to meet the requirements of high-speed driving motors of electric vehicles. Microstructure evolution was studied, and the effects of Cu precipitates on magnetic and mechanical properties are discussed. Compared with conventional processes, non-oriented silicon steel prepared by strip casting exhibited advantages with regard to microstructure optimization with coarse grain and {100} texture. Two-stage rolling processes were more beneficial for uniform microstructure, coarse grains and improved texture. The high magnetic induction B50 of 1.762 T and low core losses with P1.5/50, P1.0/400 and P1.0/1000 of 1.93, 11.63 and 44.87 W/kg, respectively, were obtained in 0.20 mm sheets in strip casting. Cu precipitates significantly improved yield strength over ~120 MPa without deteriorating magnetic properties both in conventional process and strip casting. In the peak stage aged at 550 °C for 120 min, Cu precipitates retained bcc structure and were coherent with the matrix, and the yield strength of the 0.20 mm sheet was as high as 501 MPa in strip casting. The main mechanism of precipitation strengthening was attributed to coherency strengthening and modulus strengthening. The results indicated that balanced magnetic and mechanical properties can be achieved in thin-gauge non-oriented silicon steel with Cu addition in strip casting.
Highlights
Introduction published maps and institutional affilNon-oriented silicon steel is mainly used to manufacture the core component of a drive motor
(2) In terms of the two different hot band fabrication processes, it may be noted that the non-oriented silicon steels processed by strip casting process exhibited more excellent magnetic properties
The conventional process indiin preparing conventional thickness and thin-gauge non-oriented siliconnon-oriented steel with better cated advantages in preparing conventional thickness and thin-gauge silimechanical properties, while the strip casting process had some limitations in improving con steel with better mechanical properties, while the strip casting process had some limthe strength of ultra-thin non-oriented silicon steel
Summary
After normaliza-3 of 15 tion, 0.35 and 0.20 mm non-oriented silicon steels were subjected to single-stage and twostage cold rolling, respectively, followed by annealing and aging treatments. Theschematic schematicdiagram diagram strip casting conventional rolling process. Figure of of strip casting andand conventional hot hot rolling process. The conventional process, a kg ingot of experimental steel was cast in vacuum induction. The magnetic properties involving magnetic induction of B50 and core loss of P1.5/50 , P1.0/50 , P1.0/400 and P1.0/1000 were measured by a using single sheet tester with dimensions of 100 (RD) × 30 mm (transverse direction, TD). Standard tensile tests were carried out by using an AG-X plus100KN (Shimadzu, To15 kyo, Japan) testing machine at room temperature at a crosshead speed of 1 mm/min. of.
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