Abstract
Magnetoelastic hysteresis loops of grade 45 carbon (GOST 1050-88) chemical composition (in weight percentage): Fe ≈ 97%, C = 0.45–0.2%, Si = 0.17–0.37%, Mn = 0.5–0.8%, Ni < 0.25%, S < 0.04%, P < 0.035%, Cr < 0.25%, Cu < 0.25%, and As < 0.08% and 30 KhGS steel (GOST 4543-71) chemical composition (in weight percentage): Fe ≈ 96%, C = 0.28–0.35%, Si = 0.9–1.2%, Mn = 0.8–1.1%, Ni < 0.3%, S < 0.035%, P = 0.035%, Cr = 0.8–11%, and Cu = 0.3% samples tempered at different temperatures are investigated. The magnetoelastic sensitivity parameter – the tangent of the loop inclination angle – is introduced as a characteristic of the stationary change of the residual magnetization. Concepts of positive and negative piezomagnetic effects are introduced for the residually magnetized state, and the mechanism that explains the given phenomenon is suggested.
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