Abstract
The paper gives the results of measurements of the influence of plastic deformations in the time-decrease of permeability in hot rolled transformer steel. In the first part measurements were performed on samples rolled in a mill. The measurements showed a drop of time decrease of permeability at large elongations and a maximum at small elongations. In the second part measurements were performed on samples stretched in a tensile testing machine. The results of measurements are characterized by typical wavy shape of time decrease of permeability. The obtained results are connected with the variations of lengths of the paths of impurities diffusing in the crystal lattice.
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