Residual stress in steel benchmark determined by synchrotron X-ray and neutron difrraction

The data presented is the residual stress, determined by synchrotron X-ray diffraction (SXRD) at DESY operated by Hereo (P07 and P61A) and neutron diffraction (ND) at ILL(SALSA). The data is for two benchmark samples having the same geometry (U shape) that can be measured by diffraction techniques and adapted to other material systems to validate RS measurements. One of them was elastically loaded while the other had stresses generated by plastic deformation, while having the same geometry. 

The U-flexure sample flexure-compression(FC), flexure-tension(FT_ and flexure-neutral(FN) were electrical discharge machine from a rolled plate. The U-bend(B) sample was obtained by three-point bending a cuboidal blank. The thicknes of the machine part is close to 10 mm and runs parallel to the z-direction. The measurement line runs from the centre of the top surface near the bend (defined at the origin) down into the bend (positive z-direction). The FN samples acted as stress-free reference for the U-flexures and a pin extracted from the bend was used for the U-bend. For the U-flexures, a finite element analysis (FEA) model was developed to account for the slight variations in loading conditions observed in the samples used for ND and SXRD. The results of the FEA model is also presented for comparison.

The gauge volume sizes and shapes were dependent on the technique and research facility. The gauge volumes were: a) P07 – 0.2 x 0.2 x ~2.0 mm3  (b) P61A- 0.15 x 0.15 x ~3.4 µm3 (c) SALSA- 0.6 x 0.6 x 2 mm3.