Ultra-High Ductility of TRIP-Assisted Seels Modelled by Gradient Plasticity (INVITED)

Abstract eng:
TRansformation Induced Plasticity (TRIP) is an attractive route to increase the strain hardening capacity of steels containing a fraction of metastable austenite, leading to higher strength and uniform elongation. In spite of performances reached in the past decades, microstructure optimization is complex due to the interplay of coupled effects on the transformation kinetics and work hardening (phase stability, size of austenite grains, temperature and loading path). An averaging scheme is developed for predicting the response of TRIP-aided multiphase steels using strain gradient plasticity. The model parameters, based on transformation kinetics, are identified based on experimental results at different temperatures. Classical plasticity cannot capture the TRIP effect on the mechanical response, while strain gradient plasticity predicts the variation of strain hardening with deformation and temperature, paving the way towards microstructure optimization.

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