Abstract
To study the effect of the annealing temperature on the structure and magnetic properties of a 2%Si non-oriented steel cold rolled samples were submitted to final annealing in the temperature range of 540 °C to 980 °C in hydrogen atmosphere. The samples had received cold rolling reduction of 75% to a final thickness of 0.50 mm. Recovery and recrystallization resulted in significant improvement of magnetic properties, with decrease of iron loss (W1.5) and increase of polarisation (J50) and relative permeability (µ1.5). On further grain growth, after recrystallization, there was simultaneous decrease of iron loss, polarisation and relative permeability. Texture evolution on grain growth accounts for the observed decrease of J50 and µ1.5. The beneficial effect of increasing grain size on core loss overcomes the detrimental effect of texture resulting in decrease of W1.5.
Highlights
In many applications of non-oriented grain silicon steels low iron loss and high permeability are important requirements
It is well known that the magnetic properties are determined by factors such as: composition of the steel, purity level, grain size, strain, crystallographic texture, surface oxidation
The grain size obtained in the final annealing is one of the most important factors determining iron loss
Summary
In many applications of non-oriented grain silicon steels low iron loss and high permeability are important requirements. It is well known that the magnetic properties are determined by factors such as: composition of the steel, purity level, grain size, strain, crystallographic texture, surface oxidation. The polarisation measured at 5000 A/m (J50) is strongly dependent on crystallographic texture. The relative permeability at 1.5 T (μ1.5) is strongly dependent on texture, but is affected by cutting stress, grain size, surface oxidation and nitration. The grain size obtained in the final annealing is one of the most important factors determining iron loss. To optimise the magnetic properties it is important to understand its evolution in the final annealing. The purpose of the present work was to investigate the evolution of the structure, texture and the magnetic properties in the final annealing
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