Abstract
The magnetic properties of five different microstructures of AISI 4140 steel are measured as a function of compressive plastic deformation. Coercivity, hysteresis loss, remanence, permeability, differential permeability, and anhysteretic magnetisation are determined for strains of up to 10%. Coercivity, hysteresis loss, and initial permeability are found to be dependent on residual plastic strain and hardness. Remanence is only weakly dependent on plastic strain, while maximum differential permeability is insensitive to plastic strain over the range 2 to 10%. The results are interpreted in terms of changes in the number density of dislocations caused by straining beyond the yield point. Correlations are found between coercivity and hysteresis loss and between initial anhysteretic permeability and maximum differential permeability.
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