Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels
Non-oriented electrical steel sheets are applied as a core material in rotors and stators of electric machines in order to guide and magnify their magnetic flux density. Their contouring is often realized in a blanking process step, which results in plastic deformation of the cut edges and thus dete...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/22/7055 |
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| author | Lucas Boehm Christoph Hartmann Ines Gilch Anett Stoecker Rudolf Kawalla Xuefei Wei Gerhard Hirt Martin Heller Sandra Korte-Kerzel Nora Leuning Kay Hameyer Wolfram Volk |
| author_facet | Lucas Boehm Christoph Hartmann Ines Gilch Anett Stoecker Rudolf Kawalla Xuefei Wei Gerhard Hirt Martin Heller Sandra Korte-Kerzel Nora Leuning Kay Hameyer Wolfram Volk |
| author_sort | Lucas Boehm |
| collection | DOAJ |
| description | Non-oriented electrical steel sheets are applied as a core material in rotors and stators of electric machines in order to guide and magnify their magnetic flux density. Their contouring is often realized in a blanking process step, which results in plastic deformation of the cut edges and thus deteriorates the magnetic properties of the base material. This work evaluates the influence of the material’s grain size on its iron losses after the blanking process. Samples for the single sheet test were blanked at different cutting clearances (15 µm–70 µm) from sheets with identical chemical composition (3.2 wt.% Si) but varying average grain size (28 µm–210 µm) and thickness (0.25 mm and 0.5 mm). Additionally, in situ measurements of blanking force and punch travel were carried out. Results show that blanking-related iron losses either increase for 0.25 mm thick sheets or decrease for 0.5 mm thick sheets with increasing grain size. Although this is partly in contradiction to previous research, it can be explained by the interplay of dislocation annihilation and transgranular fracturing. The paper thus contributes to a deeper understanding of the blanking process of coarse-grained, thin electrical steel sheets. |
| first_indexed | 2024-03-10T05:18:49Z |
| format | Article |
| id | doaj.art-719ba7e40c1d4de68994f9fa4af06303 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T05:18:49Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-719ba7e40c1d4de68994f9fa4af063032023-11-23T00:13:01ZengMDPI AGMaterials1996-19442021-11-011422705510.3390/ma14227055Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical SteelsLucas Boehm0Christoph Hartmann1Ines Gilch2Anett Stoecker3Rudolf Kawalla4Xuefei Wei5Gerhard Hirt6Martin Heller7Sandra Korte-Kerzel8Nora Leuning9Kay Hameyer10Wolfram Volk11Chair of Metal Forming and Casting (utg), Technical University of Munich, 85748 Garching, GermanyChair of Metal Forming and Casting (utg), Technical University of Munich, 85748 Garching, GermanyChair of Metal Forming and Casting (utg), Technical University of Munich, 85748 Garching, GermanyInstitute of Metal Forming (IMF), TU Bergakademie Freiberg, 09596 Freiberg, GermanyInstitute of Metal Forming (IMF), TU Bergakademie Freiberg, 09596 Freiberg, GermanyInstitute of Metal Forming (IBF), RWTH Aachen University, 52056 Aachen, GermanyInstitute of Metal Forming (IBF), RWTH Aachen University, 52056 Aachen, GermanyInstitute for Physical Metallurgy and Materials Physics (IMM), RWTH Aachen University, 52074 Aachen, GermanyInstitute for Physical Metallurgy and Materials Physics (IMM), RWTH Aachen University, 52074 Aachen, GermanyInstitute of Electrical Machines (IEM), RWTH Aachen University, 52062 Aachen, GermanyInstitute of Electrical Machines (IEM), RWTH Aachen University, 52062 Aachen, GermanyChair of Metal Forming and Casting (utg), Technical University of Munich, 85748 Garching, GermanyNon-oriented electrical steel sheets are applied as a core material in rotors and stators of electric machines in order to guide and magnify their magnetic flux density. Their contouring is often realized in a blanking process step, which results in plastic deformation of the cut edges and thus deteriorates the magnetic properties of the base material. This work evaluates the influence of the material’s grain size on its iron losses after the blanking process. Samples for the single sheet test were blanked at different cutting clearances (15 µm–70 µm) from sheets with identical chemical composition (3.2 wt.% Si) but varying average grain size (28 µm–210 µm) and thickness (0.25 mm and 0.5 mm). Additionally, in situ measurements of blanking force and punch travel were carried out. Results show that blanking-related iron losses either increase for 0.25 mm thick sheets or decrease for 0.5 mm thick sheets with increasing grain size. Although this is partly in contradiction to previous research, it can be explained by the interplay of dislocation annihilation and transgranular fracturing. The paper thus contributes to a deeper understanding of the blanking process of coarse-grained, thin electrical steel sheets.https://www.mdpi.com/1996-1944/14/22/7055grain sizeblankingelectrical steelmagnetic properties |
| spellingShingle | Lucas Boehm Christoph Hartmann Ines Gilch Anett Stoecker Rudolf Kawalla Xuefei Wei Gerhard Hirt Martin Heller Sandra Korte-Kerzel Nora Leuning Kay Hameyer Wolfram Volk Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels Materials grain size blanking electrical steel magnetic properties |
| title | Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels |
| title_full | Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels |
| title_fullStr | Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels |
| title_full_unstemmed | Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels |
| title_short | Grain Size Influence on the Magnetic Property Deterioration of Blanked Non-Oriented Electrical Steels |
| title_sort | grain size influence on the magnetic property deterioration of blanked non oriented electrical steels |
| topic | grain size blanking electrical steel magnetic properties |
| url | https://www.mdpi.com/1996-1944/14/22/7055 |
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