High-voltage Lorentz electron microscopy studies of domain structures and magnetization processes in pearlitic steels

M. G. Hetherington Department of Metallurgy & Science of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, England

J. P. Jakubovics Department of Metallurgy & Science of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, England

J. A. Szpunar Department of Physics, University of Durham, South Road, Durham, DH1 3LE, England; Department of Physics, Queen's University, Kingston, Ontario, K7L 3N6, Canada

B. K. Tanner Department of Physics, University of Durham, South Road, Durham, DH1 3LE, England

Abstract

Pearlitic steels with volume fractions of pearlite from 5 to 100% have been studied using a high-voltage electron microscope and by measuring the Barkhausen activity. The results indicate that the microstructural parameters that affect the coercivity most strongly are the volume fractions and grain sizes of ferrite and pearlite. In electron microscope studies it was observed that domain walls were particularly strongly pinned in cementite lamellae in pearlite grains. A simple model is derived from these observations, which correctly predicts the coercivity of a large number of steels.

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High-voltage Lorentz electron microscopy studies of domain structures and magnetization processes in pearlitic steels

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High-voltage Lorentz electron microscopy studies of domain structures and magnetization processes in pearlitic steels

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