Journal
MATERIALS CHARACTERIZATION
Volume 113, Issue -, Pages 117-124Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2015.11.014
Keywords
Martensite; Electron back scatter diffraction; Misorientation; X-ray diffraction; Dislocation density
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Funding
- Hungarian Scientific Research Fund, OTKA [K-109021, PD-101028]
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The microstructure and the dislocation density in as-quenched ferrous lath martensite were studied by different methods. The blocks, packets and variants formed due to martensitic transformation were identified and their sizes were determined by electron backscatter diffraction (EBSD). Concomitant transmission electron microscopy (TEM) investigation revealed that the laths contain subgrains with the size between 50 and 100 nm. A novel evaluation procedure of EBSD images was elaborated for the determination of the density and the space distribution of geometrically necessary dislocations from the misorientation distribution. The total dislocation density obtained by X-ray diffraction line profile analysis was in good agreement with the value determined by EBSD, indicating that the majority of dislocations formed due to martensitic transformation during quenching are geometrically necessary dislocations. (C) 2016 Elsevier Inc. All rights reserved.
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