Influence of applied compressive stress on the hysteresis curves and magnetic domain structure of grain-oriented transverse Fe–3%Si steel

Abstract

The influence of an applied compressive stress on the hysteresis curve and domain structure in conventional (1 1 0) [0 0 1] Fe–3%Si steel cut transverse to the rolling direction is studied. Quasistatic hysteresis loops under compressive stress up to 75 MPa were measured. The magnetic domains and magnetization processes were observed by longitudinal Kerr microscopy at different levels of stress. It is shown that the bulk hysteresis loop can be described with a good accuracy by the action of an effective field, which is the product of the stress and a function of magnetization. Domain observations have shown that the reasons for the effective field are demagnetizing fields due to the disappearance of supplementary domains along [0 1 0] and [1 0 0] at low fields and different domain systems in different grains at moderate fields. The latter are caused by differences in grain sensitivity to stress depending on the degree of misorientation. A decrease in the effective field above 1 T is connected with a transformation of all grains into the same domain system—the column pattern.

Effect of applied tensile stress on the hysteresis curve and magnetic domain structure of grain-oriented transverse Fe-3%Si steel

“…The experimental setup used here is the same as in our previous work on compressed transverse samples [6]. Tensile stress up to 70 MPa was applied to Goss textured, grain-oriented Fe-3%Si sheets with dimensions of 0.5 Â 30 Â 280 mm 3 , cut transversely to the rolling direction.…”

“…Tensile stress up to 70 MPa was applied to Goss textured, grain-oriented Fe-3%Si sheets with dimensions of 0.5 Â 30 Â 280 mm 3 , cut transversely to the rolling direction. The samples were magnetized in a horizontal sheet tester [6] (see Fig. 1 …”

Investigating the fatigue behavior of grain-oriented Fe-3%Si steel sheets using magnet-optical Kerr microscopy and micromagnetic multiparameter, microstructure and stress analysis

“…It holds a {110}<001> (Figure 1) texture along the rolling direction. This socalled Goss texture [5] is typical in grain-oriented electrical steel and effects magnetic anisotropy with large magnetic flux density in the rolling direction (RD). The chemical composition of the investigated material is shown in Table 1.…”

“…As a result, investigations on electrical steels recently directed to their magneto-mechanical behavior, fatigue properties, manufacturing technologies, and advanced magnetic measurements on the two main groups of electrical steels, grain-oriented and non-oriented [1,[5][6][7][8][9][10][11]. Perevertov et al [1,5] described magnetic domain structure and hysteresis loops of grain-oriented Fe-3%Si under the influence of tensile and compressive elastic stresses.…”

“…Perevertov et al [1,5] described magnetic domain structure and hysteresis loops of grain-oriented Fe-3%Si under the influence of tensile and compressive elastic stresses. Fatigue behavior of high grade non-oriented electrical steels was published by Liying et al [9] focusing on crack characterization and fracture mechanisms as well as the Wöhler curve determined for a specific batch of non-oriented electrical steel (30WGP1600).…”