Cellular Automata Modeling of Plastic Deformation in Ferrite During Martensite Formation in Dual-Phase Steels

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientific

Abstract

The mechanical properties of ferrite-martensite dual phase (DP) steels are influenced by the internal stresses induced during austenite to martensite transformation. The volumetric expansion during this transformation causes plastic deformation of surrounding ferrite grains and creates regions with higher density of geometrically necessary dislocations (GNDs) near ferrite/martensite interfaces. These highly stressed regions can be modelled using the ‘core and mantle’ approach as a thin layer of hardened ferrite present at ferrite/martensite interfaces. The interface layer properties, i.e., its strength and thickness, depend upon surrounding local microstructural features. In the present work, this layer is modelled using cellular automata (CA) based microstructural evolution simulations, which make it possible to track variations in local microstructural features and assign layer properties accordingly. This new approach enables the computational study of the effect of transformation induced stresses on mechanical behaviour of different, fully controlled DP steel microstructures obtained through CA simulations.
Original languageEnglish
Title of host publicationProceedings of the 8th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking (STEELSIM 2019)
Pages740-749
DOIs
Publication statusPublished - 2019
EventSTEELSIM 2019: 8th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking - Toronto, Canada
Duration: 13 Aug 201915 Aug 2019

Conference

ConferenceSTEELSIM 2019: 8th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking
Country/TerritoryCanada
CityToronto
Period13/08/1915/08/19

Keywords

  • Cellular Automata
  • Microstructure Evolution
  • Dual-Phase Steel
  • Martensitic Formation
  • Transformation induced stresses
  • Strain Hardened Ferrite
  • Interphase

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