Effect of Oxide Shape on Magnetic Properties of Semiprocessed Nonoriented Electrical Steel Sheets.

Abstract

Kyoto Ja pan. 2) Electrical Steel Sheet Sales Div,. Nippon Steel Corp.. Chiiyoda-ku, Tokyo, I O0-8071Japan. 3) Formerly at Hirohata Works. Nippon Steel Corp., now at Himeji Japan.

Effect of Oxide Inclusions on the Magnetic Properties of Non‐Oriented Electrical Steel

“…The hot rolling temperature was regarded as 1000 °C. The viscosity of the steel matrix at the hot‐rolling temperature was 1.2 × 10 7 Pa · s . The relationship between the viscosity and the elongation ratio of oxide inclusions in Heat 1 and Heat 2 are shown in Figure .…”

“…Therefore, the viscosity of the oxide inclusions was calculated using FactSage 7.0 thermochemical software based on the composition of oxides. The hot rolling temperature was regarded as 1000 C. The viscosity of the steel matrix at the hot-rolling temperature was 1.2 Â 10 7 Pa Á s. [3] The relationship between the viscosity and the elongation ratio of oxide inclusions in Heat 1 and Heat 2 are shown in Figure 14. As shown in Figure 14a, the viscosity of most inclusions in Heat 1 was lower than that of the steel matrix, thus showing a larger elongation ratio.…”

“…Low core loss and high magnetic induction are required considering the energy conservation. Many factors such as the inclusions, [1][2][3][4][5] texture, [6][7][8] and grain size [9][10][11][12][13] can affect the magnetic properties, among which inclusions play a key role by affecting the other two factors. On the one hand, inclusions can impede the motion of domain wall, thus, deteriorate the magnetic properties directly, on the other hand, inclusions can inhibit the movement of grain boundaries and promote the heterogeneous nucleation of grains with unfavorable orientations, thus, affect the magnetic properties indirectly.…”

“…The effect of inclusions on the magnetic properties of electrical steels has been extensively studied theoretically [1] and experimentally [2][3][4][14][15][16] in the past few decades. Many works [16][17][18][19] have been presented on the pining effect of the inclusions on the grain growth due to the significant influence of the grain size on magnetic properties.…”

“…The influencing mechanism of Al 2 O 3 -SiO 2 -MnO oxide inclusions on the magnetic properties of semiprocessed non-oriented electrical steel has been reported by Kurosaki. [3] However, the role of CaO plays on the inclusions has not been discussed and the mechanism of inclusions inhibiting the grain growth has not been detailed, either.…”