from the conferences organized by TANGER Ltd.
High strength and ductility of the TRIP (Transformation Induced Plasticity) steels is attributed to the transformation induced plasticity effect resulting from the strain induced martensitic transformation of the retained austenite in the multiphase (ferrite, bainite) microstructure. The precise characterisation of the multiple microstructure of low alloyed TRIP steels is of great importance for interpretation and optimalization of their mechanical properties. The relevant information on the course of transformation can be extracted from neutron diffraction spectra. The integrated intensities of austenite and ferrite neutron diffraction profiles over the time of phase transformation can be then assumed as a measure of the volume fractions of both phases in dependence on transformation temperature. Useful information can be also received on retained austenite stability in TRIP steel during mechanical testing. The in-situ neutron diffraction experiments were conducted to asses the reliability of neutron diffraction technique in monitoring the transformation of retained austenite when subjected to tensile tests. In addition, the results received from neutron diffraction experiments were also used to evaluate the lattice strains in the ferrite and austenite phases during the straining as a function applied load.
Keywords: TRIP steel, thermomechanical treatment, retained austenite transformation, neutron diffraction, stress-strain dependences© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.