Solute drag modeling for ferrite growth kinetics during precipitation experiments

2021 ◽  
pp. 117364
Author(s):  
I.-E. Benrabah ◽  
H.P Van Landeghem ◽  
F. Bonnet ◽  
B. Denand ◽  
G. Geandier ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
Solute Drag ◽  
Ferrite Growth

A Comparison of Ferrite Growth Kinetics under Denitriding and Decarburizing Conditions

2015 ◽  
Vol 46 (6) ◽  
pp. 2449-2454 ◽  
Author(s):  
Mingxing Guo ◽  
Damon Panahi ◽  
Hugo Van Landeghem ◽  
Christopher R. Hutchinson ◽  
Gary Purdy ◽  
...  
Keyword(s):  
Growth Kinetics ◽  
Ferrite Growth

Quantifying the Solute Drag Effect on Ferrite Growth in Fe-C-X Alloys Using Controlled Decarburization Experiments

2012 ◽  
Vol 44 (8) ◽  
pp. 3472-3483 ◽  
Author(s):  
C. Qiu ◽  
H. S. Zurob ◽  
D. Panahi ◽  
Y. J. M. Brechet ◽  
G. R. Purdy ◽  
...  
Keyword(s):  
Solute Drag ◽  
Drag Effect ◽  
Ferrite Growth ◽  
Solute Drag Effect

scholarly journals Computer simulation of grain growth kinetics with solute drag

1999 ◽  
Vol 14 (3) ◽  
pp. 1113-1123 ◽  
Author(s):  
D. Fan ◽  
S. P. Chen ◽  
Long-Qing Chen
Keyword(s):  
Grain Boundary ◽  
Grain Growth ◽  
Growth Kinetics ◽  
Driving Force ◽  
Boundary Energy ◽  
Solute Drag ◽  
Lattice Diffusion ◽  
Diffuse Interface ◽  
Growth Exponent ◽  
Grain Growth Kinetics

The effects of solute drag on grain growth kinetics were studied in two-dimensional (2D) computer simulations by using a diffuse-interface field model. It is shown that, in the low velocity/low driving force regime, the velocity of a grain boundary motion departs from a linear relation with driving force (curvature) with solute drag. The nonlinear relation of migration velocity and driving force comes from the dependence of grain boundary energy and width on the curvature. The growth exponent m of power growth law for a polycrystalline system is affected by the segregation of solutes to grain boundaries. With the solute drag, the growth exponent m can take any value between 2 and 3, depending on the ratio of lattice diffusion to grain boundary mobility. The grain size and topological distributions are unaffected by solute drag, which are the same as those in a pure system.

scholarly journals Use of Space-Resolved in-Situ High Energy X-ray Diffraction for the Characterization of the Compositional Dependence of the Austenite-to-Ferrite Transformation Kinetics in Steels

2019 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Imed-Eddine Benrabah ◽  
Hugo Paul Van Landeghem ◽  
Frédéric Bonnet ◽  
Florence Robaut ◽  
Alexis Deschamps
Keyword(s):  
Growth Kinetics ◽  
Local Equilibrium ◽  
High Energy ◽  
Transformation Kinetics ◽  
Compositional Dependence ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferrite Growth

In-situ high energy X-Ray diffraction (HEXRD) was used on compositionally graded steels to study the effect of substitutional elements on ferrite growth kinetics in Fe–C–X and Fe–C–X–Y systems. Two systems were selected to illustrate the applicability of the combinatorial approach in studying such transformations, Fe–C–Mn and Fe–C–Mn–Mo. Comparison between the measured ferrite growth kinetics using HEXRD and the predicted ones using Para-Equilibrium (PE) and Local Equilibrium with Negligible Partitioning (LENP) models indicates that the fractions reached at the stasis of transformation are lower than the predicted ones. Experiments indicated a deviation of measured kinetics from both PE and LENP models when increasing Mn and decreasing Mo (in Fe–C–Mn–Mo system). The large amount of data that can be obtained using this approach can be used for validating existing models describing ferrite growth kinetics.

Electron Spectroscopic Investigations of the Solute Drag Like Effect in Fe-C-Mo Alloys

1997 ◽  
Vol 3 (S2) ◽  
pp. 553-554
Author(s):  
E.S.K. Menon ◽  
W.T. Reynolds ◽  
A.G.Fox
Keyword(s):  
Reaction Time ◽  
Growth Kinetics ◽  
Solute Drag ◽  
Boundary Region ◽  
Time Transformation ◽  
Austenite Decomposition ◽  
Interface Chemistry ◽  
Isothermal Reaction ◽  
Kinetics Of

The role of various alloying elements on the kinetics of austenite decomposition in steels is well documented. One of the least understood aspects is the ability of some elements like Mo to drastically reduce the kinetics of ferrite (α) growth in austenite (γ).Within specific ranges of transformation temperatures and alloy compositions, the transformation of austenite can cease entirely for extended periods of time (transformation stasis). The phenomenon is quite pronounced in Fe-C-Mo alloys and is clearly evidenced by a horizontal region in the plot of the fraction transformed vs. isothermal reaction time. Based on microstructural and kinetic evidence, the occurrence of the transformation stasis phenomenon has been ascribed to a "solute drag like effect" caused by the segregation of Mo atoms to α : γ boundaries. The proposal that interface chemistry alters the growth kinetics of ferrite is quite difficult to verify as the segregation is expected to be confined to a boundary region less than a nanometer in width.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

Growth Kinetics of Quantum Size ZnO Particles

1998 ◽  
Vol 536 ◽  
Author(s):  
E. M. Wong ◽  
J. E. Bonevich ◽  
P. C. Searson
Keyword(s):  
Growth Kinetics ◽  
Ostwald Ripening ◽  
Chemical Potential ◽  
Colloidal Suspensions ◽  
Green Emission ◽  
Blue Shift ◽  
Constant Current ◽  
Mass Model ◽  
Zno Particles ◽  
Kinetics Of

AbstractColloidal chemistry techniques were used to synthesize ZnO particles in the nanometer size regime. The particle aging kinetics were determined by monitoring the optical band edge absorption and using the effective mass model to approximate the particle size as a function of time. We show that the growth kinetics of the ZnO particles follow the Lifshitz, Slyozov, Wagner theory for Ostwald ripening. In this model, the higher curvature and hence chemical potential of smaller particles provides a driving force for dissolution. The larger particles continue to grow by diffusion limited transport of species dissolved in solution. Thin films were fabricated by constant current electrophoretic deposition (EPD) of the ZnO quantum particles from these colloidal suspensions. All the films exhibited a blue shift relative to the characteristic green emission associated with bulk ZnO. The optical characteristics of the particles in the colloidal suspensions were found to translate to the films.

Convective effects in microgravity on dendritic growth kinetics and morphologies

1996 ◽  
Author(s):  
M. Glicksman ◽  
M. Koss ◽  
L. Bushnell ◽  
J. LaCombe ◽  
E. Winsa
Keyword(s):  
Growth Kinetics ◽  
Dendritic Growth
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