EFFECT OF A DISPERSED PHASE ON THE MAGNETIC-PROPERTIES OF AN UNALLOYED ISOTROPIC TRANSFORMER STEEL

The grain structure and crystallographical orientation of an unalloyed , isotropic, transformer steel and the magnetic losses depend on the c ontent of the dispersed phase in it, which consists of nonmetallic inc lusions of different forms of submicroscopic sizes (as a rule, smaller than 300 nm) of ferrite uniformly distributed in the grains. Formatio n of particles less than 35 mm in size leads to a substantial increase in the magnetic losses. Depending on the production conditions of the steel and the subsequent heat treatment, the dispersed-phase particle s can have different sizes and densities of distribution. This paper i s devoted to an exploration of the methods for decreasing magnetic los ses in transformer steels by producing inclusions of the requisite siz e.