Fitting the flow curve of a plastically deformed silicon steel for the prediction of magnetic properties |
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Authors: | MJ Sablik FJG Landgraf R Magnabosco M Fukuhara MF de Campos R Machado FP Missell |
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Institution: | 1. Southwest Research Institute, 6220 Culebra Rd, San Antonio, TX 78238-5166, USA;2. Metallurgy and Mat. Sci. Dept., Escola Politecnica da USP, 05508-970, Sao Paulo, SP, Brazil;3. UNIFEI, Sao Bernardo de Campo, SP, Brazila;4. Instituto Nacional de Metrologia INMETRO, Duque de Caxias, RJ, Brazil;5. Universidade de Caxias do Sul, Caxias do Sul, RS, Brazil |
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Abstract: | We report measurements and modelling of magnetic effects due to plastic deformation in 2.2% Si steel, emphasizing new tensile deformation data. The modelling approach is to take the Ludwik law for the strain-hardening stress and use it to compute the dislocation density, which is then used in the computation of magnetic hysteresis. A nonlinear extrapolation is used across the discontinuous yield region to obtain the value of stress at the yield point that is used in fitting Ludwik's law to the mechanical data. The computed magnetic hysteresis exhibits sharp shearing of the loops at small deformation, in agreement with experimental behavior. Magnetic hysteresis loss is shown to follow a Ludwik-like dependence on the residual strain, but with a smaller Ludwik exponent than applies for the mechanical behavior. |
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Keywords: | 81 40 Lm 75 60 -d" target="_blank">gif" overflow="scroll">-d 75 50 Bb 75 10 -b" target="_blank">gif" overflow="scroll">-b |
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