Mechanical behaviour and micromechanical modelling of medium-Mn steel microstructure evolution

•Finite element modelling and experimental approaches enabled to monitor the microstructure evolution of novel medium-Mn steel.•Micromechanical modelling revealed its suitability to assess stress gradients in TRIP steels.•The chemical and mechanical driving forces for strain-induced martensitic transformation were determined.•The temperature-dependant mechanical behaviour of TRIP steel was provided.