Nucleation kinetics of proeutectoid ferrite at austenite grain boundaries in Fe-C-X alloys

1986 ◽  
Vol 17 (8) ◽  
pp. 1385-1397 ◽  
Author(s):  
M. Enomoto ◽  
H. I. Aaronson
Keyword(s):  
Grain Boundaries ◽  
Nucleation Kinetics ◽  
Austenite Grain ◽  
Proeutectoid Ferrite ◽  
Kinetics Of

Solidification Behaviour of Al Particles Embedded in an Ni Aluminide Matrix

1995 ◽  
Vol 398 ◽  
Author(s):  
K.A.Q O'Reilly ◽  
W.T. Kim ◽  
B. Cantor
Keyword(s):  
Grain Boundaries ◽  
Melt Spinning ◽  
Contact Angles ◽  
Nucleation Kinetics ◽  
Spherical Cap ◽  
Rich Phase ◽  
Heating And Cooling ◽  
Transmission Electron ◽  
Cap Model ◽  
Kinetics Of

ABSTRACTA hypereutectic Al-40wt%Ni alloy has been manufactured by melt spinning, and the resulting microstructure examined by transmission electron microscopy. As-melt spun hypereutectic Al-40wt%Ni consists of an Ni aluminide matrix and an A1-rich phase distributed in the form of particles with sizes ∼ 50-100 nm, and as an irregular layer at the cell and grain boundaries. Diffraction analysis of the Ni aluminide matrix is consistent with the ASTM x-ray diffraction standard 2θ values for the orthorhombic NiAl3 phase, a=6.6114 Å, b=7.3662 Å andc=4.8112 Å. The solidification nucleation kinetics of Al-rich particles have been examined by heating and cooling experiments in a differential scanning calorimeter over a range of heating and cooling rates. Solidification of the Al-rich phase at the cell and grain boundaries nucleates catalytically on the surrounding Ni aluminide matrix at an undercooling of ∼ 3 K. Analysis of the solidification nucleation kinetics of the Al-rich phase in Al-40wt%Ni supports the hypothesis [1-4] that the classical spherical cap model of heterogeneous nucleation breaks down at low undercoolings and small contact angles.

Three-Dimensional Observation and Growth Kinetics of Proeutectoid Ferrite Formed at Austenite Grain Boundary in a Low Carbon Microalloyed Steel

2007 ◽  
Vol 539-543 ◽  
pp. 4578-4583 ◽  
Author(s):  
Kai Ming Wu ◽  
A.M. Guo ◽  
Lin Cheng
Keyword(s):  
Grain Boundary ◽  
Growth Kinetics ◽  
Three Dimensional ◽  
Low Carbon ◽  
Austenite Grain ◽  
Ferrite Allotriomorphs ◽  
Proeutectoid Ferrite ◽  
Carbon Microalloyed ◽  
Austenite Grain Boundary ◽  
Kinetics Of

Three-dimensional observations of proeutectoid ferrite formed at grain boundary in an Fe-0.09%C-1.48%Mn vanadium microalloyed alloy was revealed by techniques of serial sectioning along with computer-aided reconstruction. The ferrite allotriomorphs nucleated at grain boundary edges were approximately prolate ellipsoids. Not all the ferrite allotriomorphs formed at grain boundary faces were oblate ellipsoids. The growth kinetics of ferrite allotriomorphs nucleated at grain boundary edges was greater than that of ferrite allotriomorphs nucleated at grain boundary faces.

scholarly journals Morphology of Proeutectoid Ferrite at Austenite Grain Boundaries in Low Carbon Steels

1988 ◽  
Vol 74 (9) ◽  
pp. 1839-1845 ◽  
Author(s):  
Kei AMEYAMA ◽  
Masanori MINAGAWA ◽  
Tadashi MAKI ◽  
Imao TAMURA
Keyword(s):  
Grain Boundaries ◽  
Carbon Steels ◽  
Low Carbon ◽  
Low Carbon Steels ◽  
Austenite Grain ◽  
Proeutectoid Ferrite
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