CAFE based multi-scale modelling of ductile-to-brittle transition of steel with a temperature dependent effective surface energy

Yang Li, Anton Shterenlikht, Xiaobo Ren, Jianying He, Zhiliang Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)

Abstract

It is still a challenge to numerically achieve the interactive competition between ductile damage and brittle fracture in ductile-to-brittle transition (DBT) region. In addition, since two types of fracture occur at two independent material length scales, it is difficult to process them with the same mesh size by using finite element method. In this study, a framework of modelling DBT of a thermal mechanical controlled-rolling (TMCR) steel is explored by using the cellular automata finite element (CAFE) method. The statistical feature of material's microstructure is incorporated in the modelling. It is found that DBT curve cannot be reproduced with only one temperature dependent flow property, for which another temperature dependent variable must be considered. A temperature dependent effective surface energy based on typical cleavage fracture stage is proposed and obtained through a continuum approach in present work. The DBT of TMCR steel is simulated by using CAFE method implemented with a temperature dependent effective surface energy. It is found that numerical simulation is able to produce a full transition curve, especially with scattered absorbed energies in the transition region represented. It is also observed that simulation results can reproduce a comparable DBT curve contrasting to the experimental results.

Original languageEnglish
Pages (from-to)220-230
Number of pages11
JournalMaterials Science and Engineering A
Volume755
Early online date5 Apr 2019
DOIs
Publication statusPublished - 7 May 2019

Keywords

  • Cellular atoumata finite element (CAFE)
  • Cleavage
  • Ductile-to-brittle transition (DBT)
  • Effective surface energy
  • TMCR steel

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