Stress Measurement of an Austenitic Stainless Steel Foil by cos2χ Method Using Polychromatic Laboratory X-rays

Elastic-plastic deformation properties of austenitic stainless steel foils were evaluated by using polychromatic laboratory X-rays. A transmission geometry was used for stress measurement. The diffraction elastic constants for several diffraction planes were measured under monotonic loading by the cos(2)chi method. The diffraction energy decreased almost linearly with increasing cos(2)chi, and the slope of the cos(2)chi, diagram decreased with increasing applied stress. Measured diffraction elastic constants were compared with the theoretical values calculated by the Kroner model. The experimental value agreed well with the theoretical value. The lattice strain measured during plastic deformation depended on the diffraction plane. The full width at half maximum increased with applied plastic strain. From the the diffraction-plane dependence of the lattice strain, the full width at half maximum and the diffraction intensity can be evaluated using polychromatic laboratory X-rays.