Influence of Crystallography on Nucleation of Ferrite Precipitates at Austenite Grain Boundary Corners in a Co-15Fe Alloy

Guo Hong Zhang; Tomoaki Takeuchi; Masato Enomoto; Yoshitaka Adachi

doi:10.4028/www.scientific.net/SSP.172-174.378

Paper Titles

Duplex Stainless Steel Microstructural Developments as Model Microstructures for Hot Ductility Investigations
p.350

Electron Microscopy Study of Hypostoichiometric Fe-Pd Nanocomposites Resulting from Combined Reactions Thermomechanical Processing
p.356

Influence of High Magnetic Field on Ferrite Transformation in Fe-C Base Alloys
p.362

Ferrite Formation Above the Ae₃ in a Medium-Carbon Steel
p.372

Influence of Crystallography on Nucleation of Ferrite Precipitates at Austenite Grain Boundary Corners in a Co-15Fe Alloy
p.378

Phase Transformation Near Dislocations and Cracks
p.384

Precipitation of Co in Supersaturated Au-Based Au-Co Alloys; Microstructural Evolution and Transformation Kinetics
p.390

β → β + α Isothermal Phase Transformation in Ti17 Titanium Alloy: Chemical Composition and Crystallographic Aspect
p.396

Phase Transformations in the NiS Nickel Sulphide: Microstructure, Mechanisms and Modelling through In Situ Microscopy.
p.402

HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Influence of Crystallography on Nucleation of...

Influence of Crystallography on Nucleation of Ferrite Precipitates at Austenite Grain Boundary Corners in a Co-15Fe Alloy

Abstract:

The nucleation of bcc ferrite precipitates at austenite grain corners in a Co-15Fe alloy was studied by serial sectioning coupled with electron backscatter diffraction (EBSD) analysis. Grain corners were identified by recombination of triple points and triangular annihilation, whereas quite a few precipitates were surrounded by more than four matrix grains when twins were counted as individual grains. More than 40% of corners composed all of high angle grain boundaries were vacant at an undercooling of ~60°C from the g/(a+g) phase boundary. All the precipitates had K-S or N-W orientation relationship with at least one grain and a larger proportion of them had the OR with two and three grains. For half of vacant corners a hypothetical precipitate could have the OR with more than one grain. It is likely that not only the misorientations among the matrix grains, but also the orientations of the grain boundary planes have a major influence on nucleation potency even at grain corners.