A model for interphase precipitation based on finite interface solute drag theory

Effects of Ferrite Growth Rate on Interphase Boundary Precipitation in V Microalloyed Steels

“…In the model proposed by Lagneborg, 10) Zajac 11) and Okamoto, 13) the intersheet spacing of carbide depends on the ledge height of the austenite/ferrite interface. And the ledge height is determined by the boundary diffusion distance of vanadium on the riser face of the growth ledge.…”

“…[6][7][8][9][10][11][12][13] In the model proposed by Todd et al, [6][7][8] the intersheet spacing of interphase boundary precipitation is determined by the diffusion profile of the solute concentration in the front of the growing interphase boundary of a "pseudophase", as which they defined the sheet region. Contrarily Rios 9) considered the intersheet spacing in vanadium steels is decided by the balance between vanadium flux entering into "vanadium diffusion zone" through the austenite/ferrite interface at the front of ledge and vanadium amount included in interphase precipitates which was formed at the neighbor of vanadium diffusion zone.…”

Interphase Precipitation – An Interfacial Segregation Model

“…Okamoto and Ågren built upon these studies incorporating the effect of solute drag in the case of an Nb microalloyed steel. 13) Recent experimental studies have elucidated the periodic-…”

“…3) Many models have been proposed in attempt to explain and provide guidance for the exploitation of interphase precipitation. [8][9][10][11][12][13][14][15][16] One branch of models including the studies of Rios,10,11) Lagneborg and Zajac 12) proposed ledge based models, using the diffusion of micro-alloying elements such as V to compute the distance when solute concentration enabled nucleation of the precipitates. Okamoto and Ågren built upon these studies incorporating the effect of solute drag in the case of an Nb microalloyed steel.…”

ALEMI: A Ten-Year History of Discussions of Alloying-Element Interactions with Migrating Interfaces

“…Bre´chet and Purdy developed an approximate solute drag treatment of the motion of such defects, [26] and more recently, Okamoto and Å gren treated the growth of ''row'' carbides in Fe-Nb-C alloys in terms of solute drag at the riser of a growth ledge and diffusion of Nb in the moving riser interface. [27] b. The…”