In this work, the influence of temperature on the mechanical properties of duplex steel is
studied by performing monotonic “in situ” tension and compression at 200oC. The lattice strains in
both phases were measured using the time-of-flight neutron diffraction method (at the ISIS
spallation neutron source, STFC Rutherford Appleton Laboratory, UK). A thermal-elastic selfconsistent
model was used to predict the expansion of the interplanar spacings during heating to
200°C. Subsequently, the variation of phase stresses during tensile and compressive loading at room
temperature (20°C) and at 200°C were theoretically calculated by the elastoplastic self-consistent
model. Comparing the model data with experimental results the critical resolved shear stresses and
work hardening parameters were determined individually in each phase of the DSS. Finally, the
yield stresses in each phase of the studied steel have been estimated. It was found that both yield
points (of austenite and ferrite) are lower at 200°C than those at room temperature.
Accounting for a Distribution of Morphologies and Orientations on Stresses Analysis by X-Ray and Neutron Diffraction: Normalized Self-Consistent Modeling