ARTICLE
Assessment of microstructural changes in S235 steel after cold rolling using eddy current testing
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Institute of Fundamental Technological Research, Polish Academy of Sciences, Warsaw, Poland
Submission date: 2025-01-10
Final revision date: 2025-03-05
Acceptance date: 2025-03-31
Online publication date: 2025-07-10
Corresponding author
Mateusz Kopec
Department of Experimental Mechanics, Institute of Fundamental Technological Research Polish Academy of Sciences, 5B Pawinskiego St., 02-106, Warsaw, Poland
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ABSTRACT
This study investigates the eddy current testing (ECT) technique to assess microstructural changes in S235 low carbon steel after cold rolling. Specimens of varying thicknesses (12 mm, 8 mm, and 6mm) were analyzed to evaluate the impact of deformation on such properties as dislocation density, grain texture, and hardness. Metallographic studies using light microscopy were performed, supplemented by dislocation density measurements via transmission electron microscopy (TEM). The ECT results demonstrated that microstructural changes, particularly cold-work hardening and grain elongation, significantly influenced the phase angle of impedance. Lower penetration depths were more sensitive to surface changes, highlighting the capacity of ECT for detecting nearsurface deformation. This work establishes a robust, non-destructive methodology for characterizing manufacturing-induced microstructural changes in heat-resistant steels, with applications in quality
control and material performance evaluation.
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