In-Situ Neutron Diffraction Study of the Deformation Behaviour of Two High-Manganese Austenitic Steels
In-situ neutron diffraction experiments under tensile loading were carried out to study the micromechanical behaviour of two iron-manganese based steels, a TWIP (twinning induced plasticity) steel with 30 wt% Mn and a TRIP steel (transformation induced plasticity) with 20 wt% Mn. The former was loaded to 31.3% strain and the latter to 20% strain. The 30 wt.% Mn steel had a fully austenitic microstructure which remained stable over the loading range studied, while stress induced austenite to α´- and ε-martensite transformations occur in the 20 wt.% Mn steel which initially contained an α´-martensite in addition to the austenite. The evolution of lattice strains under tensile loading differs between the two steels, reflected their different plastic deformation mechanisms. A stronger grain-orientation dependent behaviour is observed during deformation for the 20 wt.% Mn in contrast to the 30wt.% Mn steel.
Paolo Scardi and Cristy L. Azanza Ricardo
R. L. Peng et al., "In-Situ Neutron Diffraction Study of the Deformation Behaviour of Two High-Manganese Austenitic Steels", Materials Science Forum, Vol. 681, pp. 474-479, 2011