A thermodynamically consistent modelling framework for strongly time-dependent bainitic phase transitions
(2021) In International Journal of Solids and Structures 232.- Abstract
In this work, a thermodynamically consistent constitutive framework is introduced that is capable of reproducing the significant time-dependent behaviour of austenite-to-bainite phase transformations. In particular, the aim is to incorporate the effect of these diffusion-controlled processes by plasticity-like evolution equations instead of incorporating related global diffusion equations. To this end, a variational principle for inelastic solids is adopted and enhanced by an additional term. This term essentially contributes to the evolution equations for the phase volume fractions of several crystallography-based bainite variants. Due to the specific modifications, special attention has to be paid with respect to the fulfilment of... (More)
In this work, a thermodynamically consistent constitutive framework is introduced that is capable of reproducing the significant time-dependent behaviour of austenite-to-bainite phase transformations. In particular, the aim is to incorporate the effect of these diffusion-controlled processes by plasticity-like evolution equations instead of incorporating related global diffusion equations. To this end, a variational principle for inelastic solids is adopted and enhanced by an additional term. This term essentially contributes to the evolution equations for the phase volume fractions of several crystallography-based bainite variants. Due to the specific modifications, special attention has to be paid with respect to the fulfilment of thermodynamical consistency, which can be shown to be unconditionally satisfied for the newly proposed modelling framework. The phase transformation model itself is based on the convexification of a multi-well energy density landscape in order to provide the effective material response for possible phase mixtures. Several material parameters are determined via parameter identification based on available experimental results for 51CrV4, which also allow the quantitative evaluation of the predicted results.
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- author
- Bartel, Thorsten ; Geuken, Gian Luca and Menzel, Andreas LU
- organization
- publishing date
- 2021-12-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- 51CrV4, Bainitic phase transformations, Convexification, Multiwell energy potential, Thermodynamically consistent framework, Variational principle
- in
- International Journal of Solids and Structures
- volume
- 232
- article number
- 111172
- publisher
- Elsevier
- external identifiers
-
- scopus:85112486212
- ISSN
- 0020-7683
- DOI
- 10.1016/j.ijsolstr.2021.111172
- language
- English
- LU publication?
- yes
- id
- 2b942eb0-9e6b-4e66-8e12-ab3fbd5512d7
- date added to LUP
- 2021-09-06 10:18:11
- date last changed
- 2022-04-27 03:42:22
@article{2b942eb0-9e6b-4e66-8e12-ab3fbd5512d7,
abstract = {{<p>In this work, a thermodynamically consistent constitutive framework is introduced that is capable of reproducing the significant time-dependent behaviour of austenite-to-bainite phase transformations. In particular, the aim is to incorporate the effect of these diffusion-controlled processes by plasticity-like evolution equations instead of incorporating related global diffusion equations. To this end, a variational principle for inelastic solids is adopted and enhanced by an additional term. This term essentially contributes to the evolution equations for the phase volume fractions of several crystallography-based bainite variants. Due to the specific modifications, special attention has to be paid with respect to the fulfilment of thermodynamical consistency, which can be shown to be unconditionally satisfied for the newly proposed modelling framework. The phase transformation model itself is based on the convexification of a multi-well energy density landscape in order to provide the effective material response for possible phase mixtures. Several material parameters are determined via parameter identification based on available experimental results for 51CrV4, which also allow the quantitative evaluation of the predicted results.</p>}},
author = {{Bartel, Thorsten and Geuken, Gian Luca and Menzel, Andreas}},
issn = {{0020-7683}},
keywords = {{51CrV4; Bainitic phase transformations; Convexification; Multiwell energy potential; Thermodynamically consistent framework; Variational principle}},
language = {{eng}},
month = {{12}},
publisher = {{Elsevier}},
series = {{International Journal of Solids and Structures}},
title = {{A thermodynamically consistent modelling framework for strongly time-dependent bainitic phase transitions}},
url = {{http://dx.doi.org/10.1016/j.ijsolstr.2021.111172}},
doi = {{10.1016/j.ijsolstr.2021.111172}},
volume = {{232}},
year = {{2021}},
}