Superledge Model for Interphase Precipitation During Austenite-to-Ferrite Transformation

Chen, Meng-Yang; Gouné, Mohamed; Militzer, Matthias; Bréchet, Y.; Yang, Jer-Ren

doi:10.1007/s11661-014-2486-8

Cited by 24 publications

(18 citation statements)

References 24 publications

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“…A second branch of models includes the studies of Liu 9) and recently Chen et al 15,16) who both considered that the formation of interphase precipitates has a strong pinning force upon the advancing ferrite interface, which decreases the kinetics of the γ→α transformation. However, as Murakamai et al 14) pointed out the pinning force from precipitates as small as 1 nm (in the order of 6 J mol − 1 ) would be relatively insignificant compared to the driving force for ferrite transformation.…”

Section: Interphase Precipitation -An Interfacial Segregation Modelmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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Interphase Precipitation – An Interfacial Segregation Model

et al. 2017

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Section: Interphase Precipitation -An Interfacial Segregation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interphase Precipitation – An Interfacial Segregation Model

et al. 2017

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“…Recently, a new model combining this model with super ledge formation has been suggested to explain carbon band formation quantitatively. 39,40) The interface between carbides migrates, forming super ledges, which then combine with each other, leaving the carbides.…”

Section: Gray Model (Early Stage Model)mentioning

confidence: 99%

Interphase Precipitation and Application to Practical Steels

Funakawa¹

2019

Mater. Trans.

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Interphase precipitation is a phenomenon in which precipitates are generated on interphase boundaries during phase transformation, creating carbides having a form like bands or fibers in micro-alloyed steels. In isothermal transformation, a lower transformation temperature reduces the carbide diameter and band spacing, and a higher cooling rate reduces them in the continuous cooling process. Various interphase precipitation mechanisms have been suggested, and some models for the ledge mechanism attempted to explain the regular band spacing in steels containing carbide-forming elements quantitatively. Recently, as the orientation relationship in the grains of the interphase boundary is not consistent with the ledge mechanism, three-dimensional interface structures have been suggested to explain the experimental results of observation by transmission electron microscopy in low carbon steel. The newly-proposed interphase structure model may explain both the ledge and quasi-ledge mechanisms. Steels with tensile strength of more than 590 MPa, which are manufactured by using interphase precipitated carbides, have been developed and used practically not only in plate and sheet products but also in forged products to improve formability. In steels consisting of ferrite and a second hard phase, interphase precipitated carbides are used to realize high local ductility and to reduce the difference of hardness between the two phases. Ferritic steels strengthened by nanometer-sized carbides are developed to achieve excellent formability, realizing precipitationstrengthening of more than 300 MPa.

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“…A number of analytical models have been previously developed [12,13,14,15,16,17,18,19,20], which have primarily focussed upon the prediction of spacing between 45 sheets of interphase carbides. Although, this enables some guidance of the the processing windows for hot-rolled automotive sheets a more holistic modelling approach with the capability to simultaneously predict the morphology and nature of interphase carbide precipitates [21] as well as the inter-sheet spacing is required to truly optimise processing.…”

Section: Modelling Of Interphase Precipitationmentioning

confidence: 99%

A phase-field model for interphase precipitation in V-micro-alloyed structural steels

Rahnama

Clark

Janík

et al. 2017

Computational Materials Science

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A multi-component phase field model was developed based on CALPHAD method and directly coupled with the CALPHAD thermodynamic database using a four-sublattice model. Interphase carbide precipitation at the γ/α interface is simulated and the predictions are tested against reported experimental results for a medium carbon, vanadium micro-alloyed steel during an isothermal γ → α + M C transformation at 973 K. The model is found to be able to accurately predict: interphase precipitate composition, morphology and size of the precipitates. Furthermore, the tip-to-tip pairing of interphase precipitates in γ/α interphase boundaries is elucidated and found to be attributable to the minimisation of interfacial energy.

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Superledge Model for Interphase Precipitation During Austenite-to-Ferrite Transformation

Cited by 24 publications

References 24 publications

Interphase Precipitation – An Interfacial Segregation Model

Interphase Precipitation – An Interfacial Segregation Model

Interphase Precipitation and Application to Practical Steels

A phase-field model for interphase precipitation in V-micro-alloyed structural steels

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