Oxygen potencial effects on the oxidation sublayer and its influence on the magnetic properties of eletric steels after the final annealing heat treatment. / O efeito do potencial de oxigênio na oxidação subsuperficial e suas influências nas propriedades magnéticas de aços elétricos após o recozimento final.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

Semi processed electrical steels, used for the manufacture of rotor and stator laminations are acquired from Steel Markers and after being punched in its final shape, must undergo an annealing heat treatment, which aims to improve the magnetic properties of the steel. If this heat treatment is carried out under inappropriate conditions, the dissolved elements in the matrix that have a certain affinity with oxygen will react together, thereby forming an oxides subsuperficial layer. This layer is considered villain for these steels for deteriorating their magnetic properties, better saying, it decreases the magnetic permeability and increases the magnetic loss. The formation of these oxides occurs during the heat treatment due to too long steel exposure at high temperatures and high oxygen potential, which directly influences the thickness and morphology of semi processed steel whose sum of the silicium and aluminum components are 0,5 and 2,0% in weight are particularly more susceptible to internal oxidation during this step. Then, identifying the oxygen potential influence in the formation of this layer, quantifying its deleterious effects on magnetic properties and seeking process improvements to minimize the values of losses and maximize the magnetic permeability are nowadays an important technological issue.

ASSUNTO(S)

recozimento aço elétrico (propriedades magnéticas) annealing oxidação subsuperficial electrical steel internal oxidation

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