The effect of stress triaxiality on the phase transformation in transformation induced plasticity steels: Experimental investigation and modelling the transformation kinetics

In situ multiaxial loading during neutron diffraction tests were undertaken on a low-alloyed Quenched and Partitioning (Q&P) Transformation Induced Plasticity (TRIP) Bainitic Ferrite (TBF) steel with dispersed austenite particles. The effect of stress triaxiality the evolution deformation-induced martensite is investigated under uniaxial- equibiaxial-tension as well tension/compression ratio −1:6. It shown that transformation not monotonic function triaxiality; amount similar uniaxial equibiaxial tension but it significantly smaller tension/compression. kinetics are modeled using recently developed kinetic model accounts for state stability size larger particles transform first mean volume decreases increasing strain; decreasing particle impedes phase deformation proceeds. concluded alone cannot account differences in between different states number potential nucleation sites depends state.