Thermomechanical deformation behaviour of DH36 steel during friction stir welding by experimental validation and modelling

Athanasios Toumpis, Alexander Galloway, Larbi Arbaoui, Nicolas Poletz

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Friction stir welding is a solid state thermo-mechanical deformation process from which the plasticisation behaviour of the stirred material can be evaluated throuh the study of flow stress evolution. Flow stress data also supporting the development of a local microstructural numerical model have been generated. Hot compression testing of DH36 steel has been performed at a temperature range of 700ºC-1100ºC and strain rates from 10-³ s-¹ to 10² s-¹ to study the alloy's thermo-mechanical deformation behaviour in conditions which simulate the actual friction stir welding process. It has been found that the evolution of flow stress is significantly affected by the test temperature and deformation rate. The material's constitutive equation and constants have been calculated after analysis of these data. Preliminary numerical analysis results are in good agreement with experimental observations.
Original languageEnglish
Pages (from-to)653-663
Number of pages11
JournalScience and Technology of Welding and Joining
Issue number8
Early online date26 Jul 2014
Publication statusPublished - 1 Nov 2014



  • friction stir welding (FSW)
  • thermo-mechanical deformation
  • flow stress
  • low alloy steel
  • simulation
  • modelling

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