Dual-Sensor Electromagnetic Non-Destructive Testing for Material State Assessment of different Quenched and Tempered Steels in the Context of Circular Production
Khabou, Mehdi Abdellatif 1; Schulze, Volker 1; Dietrich, Stefan
1
1 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
11 Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruher Institut für Technologie (KIT)
Abstract (englisch):
Electromagnetic non-destructive testing enables the assessment of material states in
remanufactured ferromagnetic components in the Circular Factory. This study
investigates the combined use of Magnetic Barkhausen Noise (MBN) and Eddy Current
Testing (ECT) for the characterization of quenched and tempered CrMo steels with
different carbon contents. All materials were fully martensitically hardened under identical
austenitization conditions and tempered at different temperatures to generate distinct
tempering states. Microhardness and surface residual stress measurements were used
as reference methods to capture the coupled evolution of microstructure and stress during
tempering. MBN and ECT measurements were performed under constant magnetization
conditions to ensure comparability. The dual-sensor approach is evaluated for the
classification of variations in the tempering states in Q&T steels relevant to
remanufacturing. The results show distinct magnetic responses across tempering stages
and carbon levels, indicating the suitability of combined MBN and ECT for robust inline
monitoring of material states in circular manufacturing.
remanufactured ferromagnetic components in the Circular Factory. This study
investigates the combined use of Magnetic Barkhausen Noise (MBN) and Eddy Current
Testing (ECT) for the characterization of quenched and tempered CrMo steels with
different carbon contents. All materials were fully martensitically hardened under identical
austenitization conditions and tempered at different temperatures to generate distinct
tempering states. Microhardness and surface residual stress measurements were used
as reference methods to capture the coupled evolution of microstructure and stress during
tempering. MBN and ECT measurements were performed under constant magnetization
conditions to ensure comparability. The dual-sensor approach is evaluated for the
classification of variations in the tempering states in Q&T steels relevant to
remanufacturing. The results show distinct magnetic responses across tempering stages
and carbon levels, indicating the suitability of combined MBN and ECT for robust inline
monitoring of material states in circular manufacturing.
| Zugehörige Institution(en) am KIT | Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK) |
| Publikationstyp | Proceedingsbeitrag |
| Publikationsmonat/-jahr | 07.2026 |
| Sprache | Englisch |
| Identifikator | KITopen-ID: 1000195252 |
| Erschienen in | Proceedings of the 14th European Conference on Non-Destructive Testing 2026 (ECNDT 2026), June 15-19, 2026 in Verona, Italy (ECNDT 2026) |
| Veranstaltung | 14th European Conference on Non-Destructive Testing (ECNDT 2026), Verona, Italien, 15.06.2026 – 19.06.2026 |
| Verlag | NDT.net |
| Projektinformation | SFB 1574 KLF, 471687386 (DFG, DFG KOORD, SFB 1574/1) |
| Schlagwörter | Magnetic Barkhausen Noise, Eddy Current Testing, Quenched and Tempered, Steels, Material State Assessment, Micromagnetic NDT |