A Gibbs Energy Balance Model for Growth Via Diffusional Growth-Ledges

Sam Clark, Yongjun Lan, Alireza Rahnama, Vit Janik, Seetharaman Sridhar

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Abstract

Growth ledges are commonly observed on interphase boundaries during diffusional phase transformations and are of great importance for understanding inter-sheet spacing of interphase precipitates. A simple model based on Gibbs Energy Balance (GEB) for describing growth kinetics via diffusional growth-ledges of height λ is presented for the case of ferrite growth into austenite. The model is validated against the case of austenite to ferrite transformation involving interphase precipitation in a V, Mn, Si alloyed HSLA steel where, λ is assumed to be equal to the inter-sheet spacing of interphase carbide precipitates. The presented model provides a computationally efficient and versatile method for predicting the ledge height, λ, and the growth kinetics of ferrite from initial nucleation through to final soft impingement considering the evolution of solute drag at growth ledge risers. It is suggested that the intrinsic mobility of growth ledge risers is: M_m^αR=0.58exp((-140×〖10〗^3)/RT) mmol.J^(-1) s^(-1), with R the gas constant and T the absolute temperature in K.
Original languageEnglish
Article number ISIJINT-2018-621
Pages (from-to)573-582
Number of pages10
JournalISIJ International
Volume59
Issue number3
Early online date27 Dec 2018
DOIs
Publication statusPublished - 1 Mar 2019

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Gibbs free energy
Energy balance
Ferrite
Growth kinetics
Austenite
Precipitates
Steel
Theophylline
Drag
Carbides
Nucleation
Gases
Phase transitions
Temperature

Bibliographical note

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • Growth ledges
  • Interphase precipitation
  • Solute drag

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

A Gibbs Energy Balance Model for Growth Via Diffusional Growth-Ledges. / Clark, Sam; Lan, Yongjun; Rahnama, Alireza; Janik, Vit; Sridhar, Seetharaman.

In: ISIJ International, Vol. 59, No. 3, ISIJINT-2018-621, 01.03.2019, p. 573-582.

Research output: Contribution to journalArticle

Clark, Sam ; Lan, Yongjun ; Rahnama, Alireza ; Janik, Vit ; Sridhar, Seetharaman. / A Gibbs Energy Balance Model for Growth Via Diffusional Growth-Ledges. In: ISIJ International. 2019 ; Vol. 59, No. 3. pp. 573-582.
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