Baczmański, Andrzej
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Item type:Article, Access status: Open Access , Effects of asymmetric rolling with tilted material entry on texture and mechanical properties of aluminiumByrska-Wójcik, Dorota Joanna; Ostachowska, Monika; Gibek, Julia; Wierzbanowski, Krzysztof; Wróbel, Mirosław; Błoniarz, Remigiusz; Baczmański, Andrzej; Kopyściański, Mateusz; Kalemba-Rec, Izabela
Wydział Inżynierii Metali i Informatyki Przemysłowej; Wydział Fizyki i Informatyki Stosowanej; Wydział Fizyki i Informatyki StosowanejAsymmetric rolling texture of aluminium alloy 1050 was examined both experimentally and numerically. The rolling asymmetry was realized using rolls with different diameters rotating with the same angular velocity and by varying inclination of the rolling strip (i.e., the flat and tilted entry of the rolled strip between rolls). The final, 84% reduction in the thickness was obtained after six consecutive rolling passes. Crystallographic texture variation over the rolled bar thickness was determined using X-ray diffraction and predicted using the Finite Element Method combined with two crystalline deformation models (i.e., the elasto-plastic and the elasto-viscoplastic ones). Textures predicted by both models, taking into account all deformation process parameters, are in good agreement with experimental results. The obtained results confirm the effect of texture modifications caused by the shear stress component, resulting in the shifts of selected texture maxima in the orientation space, and explain the observed texture distribution across the sample depth. The novelty of this work consist in examination of the role of the tilted material entry (besides a difference in rolls diameters) in homogenization of texture distribution in multi-pass asymmetric rolling. The rolling geometry process variants, recommended for the technological practice, are indicated.Item type:Article, Access status: Open Access , Angle- and energy- dispersive diffraction used to determine stress evolution in 17-4 PH stainless steel produced by ADAM and subjected to SMAT process(2025) Marciszko-Wiąckowska, Marianna; Baczmański, Andrzej; Apel, Daniel; Klaus, Manuela; Genzel, Christoph; Chemkhi, Mahdi; Saferna, Marcin; Wierzbanowski, Krzysztof; Kawałko, Jakub; Le Joncour, Lea; François, Manuel; Bała, Piotr
Wydział Fizyki i Informatyki StosowanejIn this study, the evolution of residual stress and elastic anisotropy in 17-4 PH stainless steel produced by Atomic Diffusion Additive Manufacturing (ADAM) and then subjected to Surface Mechanical Attrition Treatment (SMAT) was investigated. Angle- and energy-dispersive X-ray diffraction techniques were employed to analyse the residual stress profiles in both the as-built and SMAT-treated samples. The results reveal that SMAT introduces compressive residual stresses while refining the material subgrain structure. Residual stress analysis indicates that the as-built sample exhibits tensile stresses near the surface, which gradually decrease with depth. In contrast, the SMAT-treated sample shows compressive stresses, ranging from -200 MPa at the surface to -600 MPa in deeper regions. This study highlights the critical role of selecting an appropriate grain interaction model for X-ray Stress Factors (XSFs) calculation to ensure accurate residual stress characterization, which is essential for the reliability and performance of additively manufactured components, particularly applications with high level loading.Item type:Article, Access status: Open Access , Evolution of intergranular stresses in titanium studied using grazing incident X-ray diffraction and self-consistent model(2025) Nowak, Sylwia; Wroński, Marcin; Wroński, Sebastian; Baczmański, Andrzej; Marciszko-Wiąckowska, Marianna; Braham, Chedly
Wydział Fizyki i Informatyki StosowanejOne of the important causes for the formation of residual stresses in polycrystalline materials is the anisotropy of the plastic deformation process. Different slip systems activity leads to different plastic deformations of polycrystalline grains. The resulting mismatch (incompatibility) between adjacent grains is a source of the second order incompatibility stresses. These stresses cannot be easily measured directly, but can be predicted by elastoplastic deformation models. In the present work, stresses in deformed titanium alloy are studied. The grazing incidence X-ray diffraction measurements carried out during an "in situ" tensile test and a novel method of interpreting the experimental data allowed us to determine the evolution of macroscopic stresses and second order stresses during elastic-plastic deformation. This work shows that second order stresses, related to microstructure of material, are generated during plastic deformation and remain in the material. It was shown that the distribution of second order stresses in the Euler space correlates with the distribution of the Schmid factor for the non-basal crystallographic systems, especially Pyramidal system P1 <c+a>. This confirms that these systems play a key role in generating intergranular stresses. Comparison of the experimental data with the predictions of the self-consistent model also allowed the determination of the critical resolved shear stresses for slip systems activated during plastic deformation.