Crack propagation in TRIP assisted steels modeled by crystal plasticity and cohesive zone method Articles uri icon

authors

  • DAKSHINAMURTHY, MANJUNATH
  • Ma, Anxin

publication date

  • August 2018

start page

  • 545

end page

  • 555

volume

  • 96

international standard serial number (ISSN)

  • 0167-8442

abstract

  • The influence of transformation induced plasticity (TRIP) on materials mechanical behaviours, as well as failure phenomena including crack propagation and phase boundary debonding in multiphase steels (e.g. dual phase steels, TRIP steels) are studied by using an advanced crystal plasticity finite element method. We have coupled the crystal plasticity model Ma and Hartmaier (2015), which explicitly considers elastic-plastic deformation of ferrite and austenite, austenite-martensite phase, with a cohesive zone model designed for crack propagation, to study the deformations of several representative microstructural volume elements (RVE). Results shows that, the transformation induced plasticity enhances materials strength and ductility, hinders crack propagation and influences interface debonding. Furthermore, the martensitic transformation kinetics in TRIP steels was found depending on the crystallographic orientation and the stress state of a retained austenite grain. The current simulation results helps to investigate and design multiphase steels with improved mechanical properties.

keywords

  • Crystal plasticity; Metastable austenite; Transformation induced plasticity (TRIP); Cohesive zone method; Martensite versus ferrite-martensite cracking