Residual stresses appear in almost all production processes where energy is introduced into the material and affect the product's lifetime. The final thesis is based on a theoretical review and focuses on residual stresses that occur in duplex stainless steel welds. Welded square and H-profiles made of slender duplex stainless steel will be considered. Tensile and compressive stress measurements were performed using the non-destructive neutron diffraction method. Hardness analysis and microstructural characterization were performed using optical microscopy and electron backscatter diffraction. With this, the volume fraction of each phase and the calculated residual voltage were determined. The highest tensile residual stresses of the welded square profiles were observed near the welds, namely for sample S-1 and S-2. For the H-profile, however, the highest residual stresses were observed at the mid-span of the side plates and at both ends of the flange.
|
