Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel
Dynamic strain-induced transformation (DSIT) enables the formation of fine-grained ferritic microstructures, which are well suited for cold forming processes in the as-rolled condition. In this work, the formation mechanism, chemical composition, and crystallographic orientation of DSIT ferrite were...
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MDPI AG
2022-02-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/2/313 |
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| author | Stefan Monschein Katharina S. Ragger Josef Fasching Dominik Zügner Ronald Schnitzer |
| author_facet | Stefan Monschein Katharina S. Ragger Josef Fasching Dominik Zügner Ronald Schnitzer |
| author_sort | Stefan Monschein |
| collection | DOAJ |
| description | Dynamic strain-induced transformation (DSIT) enables the formation of fine-grained ferritic microstructures, which are well suited for cold forming processes in the as-rolled condition. In this work, the formation mechanism, chemical composition, and crystallographic orientation of DSIT ferrite were investigated in a micro-alloyed steel and compared to pre-eutectoid ferrite. High-resolution techniques, such as scanning transmission electron microscopy and atom probe tomography (APT), were used for the investigations. To generate DSIT ferrite and pre-eutectoid ferrite, different experimental routes were applied using a compression deformation dilatometer. The results show a large number of NbC precipitates within DSIT ferrite, and show that the formation of DSIT ferrite is accompanied with C diffusion and the formation of retained austenite. APT measurements revealed that the C- and Mn concentration in DSIT ferrite is higher compared to pre-eutectoid ferrite. The crystallographic orientation of DSIT ferrite was examined using electron backscatter diffraction. The crystallographic orientation of DSIT ferrite after the deformation route revealed that the <111> plane normals are parallel to the compression direction with the <110> directions pointing towards the radial direction of the compressed sample. The results suggest that the formation of DSIT ferrite is a displacive mechanism, accompanied by C diffusion. |
| first_indexed | 2024-03-09T21:25:39Z |
| format | Article |
| id | doaj.art-6462495c7acd41deba7e4f657292c9b1 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T21:25:39Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-6462495c7acd41deba7e4f657292c9b12023-11-23T21:08:25ZengMDPI AGMetals2075-47012022-02-0112231310.3390/met12020313Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT SteelStefan Monschein0Katharina S. Ragger1Josef Fasching2Dominik Zügner3Ronald Schnitzer4Department of Materials Science, Montanuniversität Leoben, Franz Josef-Straße 18, 8700 Leoben, AustriaVoestalpine Wire Rod Austria GmbH, Drahtstraße 1, 8792 St. Peter-Freienstein, AustriaVoestalpine Stahl Donawitz GmbH, Kerpelystraße 199, 8700 Leoben, AustriaVoestalpine Forschungsservicegesellschaft Donawitz GmbH, Kerpelystraße 199, 8700 Leoben, AustriaDepartment of Materials Science, Montanuniversität Leoben, Franz Josef-Straße 18, 8700 Leoben, AustriaDynamic strain-induced transformation (DSIT) enables the formation of fine-grained ferritic microstructures, which are well suited for cold forming processes in the as-rolled condition. In this work, the formation mechanism, chemical composition, and crystallographic orientation of DSIT ferrite were investigated in a micro-alloyed steel and compared to pre-eutectoid ferrite. High-resolution techniques, such as scanning transmission electron microscopy and atom probe tomography (APT), were used for the investigations. To generate DSIT ferrite and pre-eutectoid ferrite, different experimental routes were applied using a compression deformation dilatometer. The results show a large number of NbC precipitates within DSIT ferrite, and show that the formation of DSIT ferrite is accompanied with C diffusion and the formation of retained austenite. APT measurements revealed that the C- and Mn concentration in DSIT ferrite is higher compared to pre-eutectoid ferrite. The crystallographic orientation of DSIT ferrite was examined using electron backscatter diffraction. The crystallographic orientation of DSIT ferrite after the deformation route revealed that the <111> plane normals are parallel to the compression direction with the <110> directions pointing towards the radial direction of the compressed sample. The results suggest that the formation of DSIT ferrite is a displacive mechanism, accompanied by C diffusion.https://www.mdpi.com/2075-4701/12/2/313dynamic strain-induced ferritethermomechanical processingmicro-alloyed steelatom probe tomographyelectron backscatter diffraction |
| spellingShingle | Stefan Monschein Katharina S. Ragger Josef Fasching Dominik Zügner Ronald Schnitzer Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel Metals dynamic strain-induced ferrite thermomechanical processing micro-alloyed steel atom probe tomography electron backscatter diffraction |
| title | Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel |
| title_full | Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel |
| title_fullStr | Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel |
| title_full_unstemmed | Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel |
| title_short | Microstructural, Chemical, and Crystallographic Investigations of Dynamic Strain-Induced Ferrite in a Microalloyed QT Steel |
| title_sort | microstructural chemical and crystallographic investigations of dynamic strain induced ferrite in a microalloyed qt steel |
| topic | dynamic strain-induced ferrite thermomechanical processing micro-alloyed steel atom probe tomography electron backscatter diffraction |
| url | https://www.mdpi.com/2075-4701/12/2/313 |
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