A mass transport theory for interphase precipitation with application to vanadium steels

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

“…Todd et al [6][7][8] proposed the prediction model based on the solute-drag nucleation model. In their model, the intersheet spacing is determined by the width of diffusion layer of V. On the other hand, the model proposed by Rios 9) is based on the ledge mechanism.…”

“…[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.…”

Current Understanding of Microstructure and Properties of Micro-Alloyed Low Carbon Steels Strengthened by Interphase Precipitation of Nano-Sized Alloy Carbides: A Review

“…Davenport and Honecycombe 42 originally proposed that the formation of alloy carbides at the a/c interface is caused by C partitioning into c ahead of the migrating interface. Later, the local enrichment of C 43 or carbide-forming elements 44,45 at the a/c interface was supposed to be the factor inducing the nucleation of subsequent sheets of interphase precipitation, which further determines the inter-sheet spacing. 46 After that, models taking the ledge structures into account were developed, whereas the volume diffusion of carbide-forming elements in a 47 and interfacial diffusion along the riser 48 were considered to be the rate-controlling processes.…”