Microstructure Evolution in a GOES Thin Strip
This paper focuses on the evolution of the microstructure in a grain-oriented electrical steel (GOES) thin strip after casting. After solidification, the microstructure consisted of delta-ferrite. A small fraction of austenite was formed during the cooling of the thin strip in the two-phase region (...
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MDPI AG
2022-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/1/51 |
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| author | Anastasia Volodarskaja Kryštof Hradečný Renáta Palupčíková Petra Váňová Vlastimil Vodárek |
| author_facet | Anastasia Volodarskaja Kryštof Hradečný Renáta Palupčíková Petra Váňová Vlastimil Vodárek |
| author_sort | Anastasia Volodarskaja |
| collection | DOAJ |
| description | This paper focuses on the evolution of the microstructure in a grain-oriented electrical steel (GOES) thin strip after casting. After solidification, the microstructure consisted of delta-ferrite. A small fraction of austenite was formed during the cooling of the thin strip in the two-phase region (gamma+delta). Fine Cr<sub>2</sub>CuS<sub>4</sub> particles precipitated in the ferrite and along the delta/gamma interfaces. Laths of primary Widmanstätten austenite (WA) nucleated directly on the high-angle delta-ferrite grain boundaries. The formation of WA laths in both adjacent ferritic grains resulted in a zig-zag shape of delta-ferrite grain boundaries due to their local rotation during austenite nucleation. Based on the EBSD results, a mechanism of the formation of the zig-zag grain boundaries has been proposed. Besides the Widmanstätten morphology, austenite also formed as films along the delta-ferrite grain boundaries. Sulfide precipitation along the delta/gamma interfaces made it possible to prove that austenite decomposition upon a drop in temperature was initiated by the formation of epitaxial ferrite. Further cooling brought the decay of austenite to either pearlite or a mixture of plate martensite and some retained austenite. |
| first_indexed | 2024-03-09T11:42:17Z |
| format | Article |
| id | doaj.art-36c624bd18764e97a82c1b2b3593b633 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T11:42:17Z |
| publishDate | 2022-12-01 |
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| record_format | Article |
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| spelling | doaj.art-36c624bd18764e97a82c1b2b3593b6332023-11-30T23:30:02ZengMDPI AGMetals2075-47012022-12-011315110.3390/met13010051Microstructure Evolution in a GOES Thin StripAnastasia Volodarskaja0Kryštof Hradečný1Renáta Palupčíková2Petra Váňová3Vlastimil Vodárek4Faculty of Materials Science and Technology, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicFaculty of Materials Science and Technology, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicFaculty of Materials Science and Technology, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicFaculty of Materials Science and Technology, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicFaculty of Materials Science and Technology, VŠB—Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava, Czech RepublicThis paper focuses on the evolution of the microstructure in a grain-oriented electrical steel (GOES) thin strip after casting. After solidification, the microstructure consisted of delta-ferrite. A small fraction of austenite was formed during the cooling of the thin strip in the two-phase region (gamma+delta). Fine Cr<sub>2</sub>CuS<sub>4</sub> particles precipitated in the ferrite and along the delta/gamma interfaces. Laths of primary Widmanstätten austenite (WA) nucleated directly on the high-angle delta-ferrite grain boundaries. The formation of WA laths in both adjacent ferritic grains resulted in a zig-zag shape of delta-ferrite grain boundaries due to their local rotation during austenite nucleation. Based on the EBSD results, a mechanism of the formation of the zig-zag grain boundaries has been proposed. Besides the Widmanstätten morphology, austenite also formed as films along the delta-ferrite grain boundaries. Sulfide precipitation along the delta/gamma interfaces made it possible to prove that austenite decomposition upon a drop in temperature was initiated by the formation of epitaxial ferrite. Further cooling brought the decay of austenite to either pearlite or a mixture of plate martensite and some retained austenite.https://www.mdpi.com/2075-4701/13/1/51GOESWidmanstätten austeniteK-S orientation relationshipepitaxial ferritezig-zag grain boundaries |
| spellingShingle | Anastasia Volodarskaja Kryštof Hradečný Renáta Palupčíková Petra Váňová Vlastimil Vodárek Microstructure Evolution in a GOES Thin Strip Metals GOES Widmanstätten austenite K-S orientation relationship epitaxial ferrite zig-zag grain boundaries |
| title | Microstructure Evolution in a GOES Thin Strip |
| title_full | Microstructure Evolution in a GOES Thin Strip |
| title_fullStr | Microstructure Evolution in a GOES Thin Strip |
| title_full_unstemmed | Microstructure Evolution in a GOES Thin Strip |
| title_short | Microstructure Evolution in a GOES Thin Strip |
| title_sort | microstructure evolution in a goes thin strip |
| topic | GOES Widmanstätten austenite K-S orientation relationship epitaxial ferrite zig-zag grain boundaries |
| url | https://www.mdpi.com/2075-4701/13/1/51 |
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