Characterization of Deformation Twins in Meteorites and Dynamically Loaded Ferrous Materials by Means Of Electron Backscatter Diffraction, EBSD
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M. Ecke
Abstract
This work presents a comparison of crystallographic properties of twin bands formed in bcc iron and those formed in iron meteorites (Neumann bands) during high speed deformation identified by means of electron backscatter diffraction (EBSD). Deformation twins were produced in Armco iron and in steel S235 by firing with an AK74 gun and by impact pressure in the drop impact tester. The twin bands of a few micrometers thickness are embedded in the surrounding crystallographically uniformly oriented grain matrix with a misorientation angle of approx. 59° and the Σ3 incidence. The twin system {112}<111> is preferentially activated. The temperature during loading and the grain size have an impact on the extent of twin formation. However, they do not influence the twin system. The findings provide relevant information on the twin formation mechanism in ferrous bcc materials.
Kurzfassung
Die kristallographischen Eigenschaften der bei Hochgeschwindigkeitsverformung gebildeten Zwillingsbänder in krz-Eisen und in Eisen-Meteoriten (Neumannsche Bänder) wurden mit Hilfe der Rückstreuelektronenbeugung (EBSD) verglichen. In Armco-Eisen und im Stahl S235 wurden Verformungszwillinge durch Beschuss mit einem Gewehr AK74 und durch Schlagdruck im Fallwerk erzeugt. Die wenige Mikrometer dicken Zwillingsbänder sind mit einem Misorientierungswinkel von ca. 59° und der Σ3 Inzidenz in die kristallographisch einheitlich orientierte umgebende Kornmatrix eingebettet. Das Zwillingssystem {112}<111> wird bevorzugt aktiviert. Die Belastungstemperatur und die Korngröße haben einen Einfluss auf das Ausmaß der Zwillingsbildung aber nicht auf das Zwillingssystem. Die Erkenntnisse geben Hinweise zum Mechanismus der Zwillingsbildung in krz-Eisenwerkstoffen.
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© 2014, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Characterization of Deformation Twins in Meteorites and Dynamically Loaded Ferrous Materials by Means Of Electron Backscatter Diffraction, EBSD
- Microstructure and Composition of Grain Boundary- and Intragranular Oxides in Low Alloy Mn-Cr, Mn-Al-Si and Si-Al-P Hot-rolled Steel Sheets
- Selective Laser Melting – Additive Manufacturing's “New Kid on the Block”; TMF Failure of a Y-shaped Pipe in a Burner Test Rig
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
Articles in the same Issue
- Contents/Inhalt
- Contents
- Editorial
- Editorial
- Technical Contributions/Fachbeiträge
- Characterization of Deformation Twins in Meteorites and Dynamically Loaded Ferrous Materials by Means Of Electron Backscatter Diffraction, EBSD
- Microstructure and Composition of Grain Boundary- and Intragranular Oxides in Low Alloy Mn-Cr, Mn-Al-Si and Si-Al-P Hot-rolled Steel Sheets
- Selective Laser Melting – Additive Manufacturing's “New Kid on the Block”; TMF Failure of a Y-shaped Pipe in a Burner Test Rig
- Meeting Diary/Veranstaltungskalender
- Meeting Diary
