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Erschienen in:
03.09.2019 | Metals & corrosion
Precipitation process of vanadium carbide in M23C6 by atomic-scale configuration analysis
Erschienen in: Journal of Materials Science | Ausgabe 2/2020
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Abstract
The effect of vanadium (V) on the nucleation of M23C6 and vanadium carbide (VC) precipitation in Fe–Cr–V alloy was studied by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy and thermodynamic calculations. The results revealed that the lattice constant of M23C6 decreased when V atoms diffused into M23C6, which resulted in a reduction in the strain energy and increase in the driving force for the nucleation of M23C6. The V-rich zone was also formed in M23C6 as the V content increased, thereby resulting in the precipitation of a new VC particle adjacent to M23C6 as well as a new orientation relationship (OR), specifically \( (1\bar{1}1)_{\text{VC}} //(2\bar{4}2)_{{{\text{M}}_{23} {\text{C}}_{6} }} \) and \( [011]_{\text{VC}} //[111]_{{{\text{M}}_{ 2 3} {\text{C}}_{ 6} }} \). Based on the OR, the formation process of VC in M23C6 was discussed by atomic-scale structure analysis.