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Application of the Thermodynamic Extremal Principle to Massive Transformations in Fe-C Alloys

The thermodynamic extremal principle was applied to propose a model in which trans-interface diffusion from the product phase to the interface, from the interface to the parent phase and interface migration are integrated for diffusion-controlled phase transformations in Fe-C alloys. Compared with t... Full description

Journal Title: Metallurgical and materials transactions. A Physical metallurgy and materials science, 2018-07-10, Vol.49 (10), p.4484-4494
Main Author: Li, Xin
Other Authors: Kuang, Wangwang , Zhang, Jianbao , Zhou, Qing , Wang, Haifeng
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: New York: Springer US
ID: ISSN: 1073-5623
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recordid: cdi_proquest_journals_2067505206
title: Application of the Thermodynamic Extremal Principle to Massive Transformations in Fe-C Alloys
format: Article
creator:
  • Li, Xin
  • Kuang, Wangwang
  • Zhang, Jianbao
  • Zhou, Qing
  • Wang, Haifeng
subjects:
  • Alloys
  • Article
  • Carbon
  • Characterization and Evaluation of Materials
  • Chemistry and Materials Science
  • Diffusion rate
  • Ferrous alloys
  • Heat treating
  • Impingement
  • Materials Science
  • Mathematical models
  • Mechanical properties
  • Metallic Materials
  • Nanotechnology
  • Phase transitions
  • Structural Materials
  • Surfaces and Interfaces
  • Thermodynamics
  • Thin Films
ispartof: Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2018-07-10, Vol.49 (10), p.4484-4494
description: The thermodynamic extremal principle was applied to propose a model in which trans-interface diffusion from the product phase to the interface, from the interface to the parent phase and interface migration are integrated for diffusion-controlled phase transformations in Fe-C alloys. Compared with the classical models with either a local-equilibrium condition or a constrained carbon equilibrium condition, the current model is able to predict massive transformations in the two-phase region. Application to isothermal phase transformations showed that the phase transformation mode is independent of (dependent on) trans-interface diffusion when the initial composition is close to the T 0 line (close to the α / α  +  γ boundary). Ascribed to the large solute diffusivity of C, the thickness of the spike upon massive transformations could be much larger than the atomic spacing and the diffusion-controlled phase transformations could be faster than the interface-controlled phase transformations. Three stages, i.e. , the diffusive transformation, massive transformation and the soft impingement stages, were predicted for phase transformations upon continuous cooling, according to which the critical limit between diffusive and massive transformations was determined to be within the two-phase region, being consistent with the experimental results in ultra-low-carbon Fe-C alloys. The current work could be very useful to control diffusion-controlled phase transformations and modulate the mechanical properties of steels.
language: eng
source:
identifier: ISSN: 1073-5623
fulltext: no_fulltext
issn:
  • 1073-5623
  • 1543-1940
url: Link


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descriptionThe thermodynamic extremal principle was applied to propose a model in which trans-interface diffusion from the product phase to the interface, from the interface to the parent phase and interface migration are integrated for diffusion-controlled phase transformations in Fe-C alloys. Compared with the classical models with either a local-equilibrium condition or a constrained carbon equilibrium condition, the current model is able to predict massive transformations in the two-phase region. Application to isothermal phase transformations showed that the phase transformation mode is independent of (dependent on) trans-interface diffusion when the initial composition is close to the T 0 line (close to the α / α  +  γ boundary). Ascribed to the large solute diffusivity of C, the thickness of the spike upon massive transformations could be much larger than the atomic spacing and the diffusion-controlled phase transformations could be faster than the interface-controlled phase transformations. Three stages, i.e. , the diffusive transformation, massive transformation and the soft impingement stages, were predicted for phase transformations upon continuous cooling, according to which the critical limit between diffusive and massive transformations was determined to be within the two-phase region, being consistent with the experimental results in ultra-low-carbon Fe-C alloys. The current work could be very useful to control diffusion-controlled phase transformations and modulate the mechanical properties of steels.
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subjectAlloys ; Article ; Carbon ; Characterization and Evaluation of Materials ; Chemistry and Materials Science ; Diffusion rate ; Ferrous alloys ; Heat treating ; Impingement ; Materials Science ; Mathematical models ; Mechanical properties ; Metallic Materials ; Nanotechnology ; Phase transitions ; Structural Materials ; Surfaces and Interfaces ; Thermodynamics ; Thin Films
ispartofMetallurgical and materials transactions. A, Physical metallurgy and materials science, 2018-07-10, Vol.49 (10), p.4484-4494
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0The Minerals, Metals & Materials Society and ASM International 2018
1COPYRIGHT 2018 Co-published by Springer and Kluwer Academic Publishers-Plenum Publishers
2Metallurgical and Materials Transactions A is a copyright of Springer, (2018). All Rights Reserved.
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descriptionThe thermodynamic extremal principle was applied to propose a model in which trans-interface diffusion from the product phase to the interface, from the interface to the parent phase and interface migration are integrated for diffusion-controlled phase transformations in Fe-C alloys. Compared with the classical models with either a local-equilibrium condition or a constrained carbon equilibrium condition, the current model is able to predict massive transformations in the two-phase region. Application to isothermal phase transformations showed that the phase transformation mode is independent of (dependent on) trans-interface diffusion when the initial composition is close to the T 0 line (close to the α / α  +  γ boundary). Ascribed to the large solute diffusivity of C, the thickness of the spike upon massive transformations could be much larger than the atomic spacing and the diffusion-controlled phase transformations could be faster than the interface-controlled phase transformations. Three stages, i.e. , the diffusive transformation, massive transformation and the soft impingement stages, were predicted for phase transformations upon continuous cooling, according to which the critical limit between diffusive and massive transformations was determined to be within the two-phase region, being consistent with the experimental results in ultra-low-carbon Fe-C alloys. The current work could be very useful to control diffusion-controlled phase transformations and modulate the mechanical properties of steels.
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issn1073-5623
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abstractThe thermodynamic extremal principle was applied to propose a model in which trans-interface diffusion from the product phase to the interface, from the interface to the parent phase and interface migration are integrated for diffusion-controlled phase transformations in Fe-C alloys. Compared with the classical models with either a local-equilibrium condition or a constrained carbon equilibrium condition, the current model is able to predict massive transformations in the two-phase region. Application to isothermal phase transformations showed that the phase transformation mode is independent of (dependent on) trans-interface diffusion when the initial composition is close to the T 0 line (close to the α / α  +  γ boundary). Ascribed to the large solute diffusivity of C, the thickness of the spike upon massive transformations could be much larger than the atomic spacing and the diffusion-controlled phase transformations could be faster than the interface-controlled phase transformations. Three stages, i.e. , the diffusive transformation, massive transformation and the soft impingement stages, were predicted for phase transformations upon continuous cooling, according to which the critical limit between diffusive and massive transformations was determined to be within the two-phase region, being consistent with the experimental results in ultra-low-carbon Fe-C alloys. The current work could be very useful to control diffusion-controlled phase transformations and modulate the mechanical properties of steels.
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doi10.1007/s11661-018-4790-1