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Dive into the research topics where Mirosław Wróbel is active.

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Featured researches published by Mirosław Wróbel.


Tribology Letters | 2012

Positron Annihilation Study of Defects Induced by Various Cutting Methods in Stainless Steel Grade 304

Paweł Horodek; Jerzy Dryzek; Mirosław Wróbel

We report in this article the comparison of the subsurface zones (SZs) in austenitic stainless steel 304 samples created by three cutting techniques, i.e., the laser cutting (LC), abrasive water jet (AWJ), and traditional milling cutting (MC). The crystal lattice defects distribution in this zone were investigated using the positron annihilation method. It was shown that the MC creates the great number mainly edge dislocations decorated by vacancies. Their concentration decreases with the increase of the depth from the cut surface. The total depth of the SZ is extended up to 150 μm from the cut surface. Similar dependency was observed for the AWJ machining but the total depth is much lower, i.e., 40 μm. The laser cut machining generates the zone with the lowest concentration of defects which does not vary with the depth. However, LC affects the sample up to the depth of about 500 μm. The degree of the surface roughness is similar for laser cut and AWJ, but for the MC it is five times smaller.


Journal of Microscopy | 2006

Influence of plastic deformation and prolonged ageing time on microstructure of a Haynes 242 alloy

S. Dymek; Mirosław Wróbel; M. Dollar; M. Blicharski

The material used in this study was a commercial HAYNES® alloy 242™ with a nominal composition of Ni‐25% Mo‐8% Cr (in wt.%). In the standard heat treatment, the 242 alloy is annealed at a temperature between 1065 and 1095 °C and then water quenched. The ageing treatment is carried out at 650 °C for 24 h in order to develop the long‐range‐order strengthening. The alloy in the conventionally aged condition was additionally cold rolled to 50% reduction in thickness and subsequently subjected to prolonged ageing at 650 °C for 4000 h. The enhanced diffusion resulted in the decomposition of the Ni2(Mo,Cr) metastable phase into the stable Ni3Mo‐based phase. The presence of the new stable phase increased the yield and tensile strengths but deteriorated the ductility of the alloy at both room and 650 °C temperatures.


Materials Science Forum | 2010

Crystallographic Textures Variation in Asymmetrically Rolled Steel

Sebastian Wroński; K. Wierzbanowski; Brigitte Bacroix; Mirosław Wróbel; M. Wroński

The crystallographic texture formation in low carbon steel during asymmetric rolling was studied experimentally and analysed numerically. Modelling of plastic deformation was done in two scales: in the macro-scale using the finite element method ( FEM) and in crystallographic scale using the polycrystalline deformation model (LW model). The stress distribution in the rolling gap was calculated using FEM and next these stresses were applied in LW model of polycrystalline plastic deformation. In general, the predicted textures agree very well with experimental ones.


Metals and Materials International | 2015

Effect of rolling asymmetry on selected properties of grade 2 titanium sheet

M. Wroński; K. Wierzbanowski; Mirosław Wróbel; Sebastian Wroński; Brigitte Bacroix

Asymmetric rolling can be used in order to modify material properties and to reduce forces and torques applied during deformation. This geometry of deformation is relatively easy to implement on existing industrial rolling mills and it can provide large volumes of a material. The study of microstructure, crystallographic texture and residual stress in asymmetrically rolled titanium (grade 2) is presented in this work. The above characteristics were examined using the EBSD technique and X-ray diffraction. The rolling asymmetry was realized using two identical rolls, driven by independent motors, rotating with different angular velocities. It was found that asymmetric rolling leads to microstructure modification and refinement. At low deformations one observes a process of grain size decrease caused by the asymmetry of rolling process. In contrast, at the medium range of deformations the microstructure refinement consists mainly in subgrain formation and grain fragmentation. Another observation is that for low to intermediate rolling reductions (≤40%) the predominant mechanisms are slip and twinning, while for higher deformation (>40%) the main mechanism is slip. It was found that grain refinement effect, caused by the rolling asymmetry, persists also after recrystallization annealing. And finally, texture homogenization and reduction of residual stress were confirmed for asymmetrically rolled samples.


Philosophical Magazine | 2011

Residual stress field in steel samples during plastic deformation and recovery processes

Roman Wawszczak; Andrzej Baczmanski; Chedly Braham; Wilfrid Seiler; Mirosław Wróbel; K. Wierzbanowski; Alain Lodini

An X-ray diffraction method was applied to measure residual stresses and stored elastic energy in deformed and annealed polycrystalline ferritic and austenitic steel samples. The orientation distribution of plastic incompatibility second-order stresses created during elastoplastic deformation was determined and presented in Euler space. Using deformation models, these stresses were correlated with different types of intergranular interactions occurring in the studied materials. An important decrease of the first- and the second-order residual stresses was observed during recovery and recrystallisation processes. Diffraction peak widths, related to dislocation density, were studied and correlated with stress variation during annealing process. Differences in stress relaxation between ferritic and austenitic samples were explained by different values of the stacking fault energy, which influences dislocation climb and cross-slip.


IOP Conference Series: Materials Science and Engineering | 2015

Study of texture, microstructure and mechanical properties of asymmetrically rolled aluminium

M. Wroński; K. Wierzbanowski; Sebastian Wroński; Brigitte Bacroix; Mirosław Wróbel; A. Uniwersał

Asymmetric rolling is a promising forming technique offering numerous possibilities of material properties modification and the improvement of technological process parameters. This geometry of deformation is relatively easy to implement on existing industrial rolling mills. Moreover, it can provide large volume of a material with modified properties. The study of microstructure, crystallographic texture and mechanical properties of asymmetrically rolled aluminium is presented in this work. The above characteristics were examined using EBSD technique and X-ray diffraction. The rolling asymmetry was realized using two identical rolls, driven by independent motors, rotating with different angular velocities. It was found that asymmetric rolling leads to microstructure refinement, texture homogenization and decreasing of residual stress.


Scripta Metallurgica Et Materialia | 1995

Microstructural changes due to rolling of austenitic stainless steel single crystals with initial orientation (110) [001] and (110) [1̄10]

Mirosław Wróbel; S. Dymek; Marek Blicharsk; Julian H. Driver

Plastic deformation of austenitic stainless steels is usually accomplished by combination of slip and twinning. The relative intensity of the deformation mechanisms depends on many factors including temperature of deformation, strain rate and deformation mode as well as crystallographic orientation. The objective of the investigation is to find microstructural changes during cross rolling of an austenitic single crystal with the initial (110)[001] crystallographic orientation and to compare it with microstructure in the uni-directionally rolled (110)[{bar 1}10] single crystal. This should constitute a contribution to better understanding of microstructure development during plastic deformation.


Journal of Applied Crystallography | 2016

Analysis of stresses and crystal structure in the surface layer of hexagonal polycrystalline materials: a new methodology based on grazing incidence diffraction

Marianna Marciszko; Andrzej Baczmanski; Chedly Braham; Mirosław Wróbel; Wilfrid Seiler; Sebastian Wroński; Katarzyna Berent

The multireflection grazing-incidence X-ray diffraction (MGIXD) method is commonly used to determine a stress gradient in thin surface layers (about 1–20 µm for metals). In this article, the development of MGIXD to enable the determination not only of stresses but also of the c/a ratio and the a0 strain-free lattice parameter in hexagonal polycrystalline materials is presented and tested. The new procedure was applied for the results of measurements performed using a laboratory X-ray diffractometer and synchrotron radiation. The evolution of stresses and lattice parameters with depth was determined for Ti and Ti-alloy samples subjected to different mechanical surface treatments. A very good agreement of the results obtained using three different wavelengths of synchrotron radiation as well as classical X-rays (Cu Kα radiation) was found.


Journal of Applied Crystallography | 2015

Problem of elastic anisotropy and stacking faults in stress analysis using multireflection grazing-incidence X-ray diffraction

Marianna Marciszko; Andrzej Baczmanski; Mirosław Wróbel; Wilfrid Seiler; Chedly Braham; Sebastian Wroński; Roman Wawszczak

Multireflection grazing-incidence X-ray diffraction (MGIXD) was used to determine the stress- and strain-free lattice parameter in the surface layer of mechanically treated (polished and ground) tungsten and austenitic steel. It was shown that reliable diffraction stress analysis is possible only when an appropriate grain interaction model is applied to an anisotropic sample. Therefore, verification of the X-ray stress factors (XSFs) was accomplished by measuring relative lattice strains during an in situ tensile test. The results obtained using the MGIXD and standard methods ( and geometries) show that the Reuss and free-surface grain interaction models agree with the experimental data. Moreover, a new interpretation of the MGIXD results was proposed and applied for the first time to measure the probability of stacking faults as a function of penetration depth for a polished and ground austenitic sample. The XSF models verified in the tensile test were used in the analysis of residual stress components.


Materials Science Forum | 2014

Study of Microstructure, Texture and Residual Stress in Asymmetrically Rolled Titanium

M. Wroński; K. Wierzbanowski; Lucjan Pytlik; Brigitte Bacroix; Mirosław Wróbel; Andrzej Baczmanski; Alain Lodini

Asymmetric rolling is a promising forming technique offering numerous possibilities of material properties modification and the improvement of technological process parameters. This geometry of deformation is relatively easy to implement on existing industrial rolling mills. Moreover, it can provide large volume of a material with modified properties. The study of microstructure, crystallographic texture and residual stress in asymmetrically rolled titanium (grade 2) is presented in this work. The above characteristics were examined using EBSD technique and X-ray diffraction. The rolling asymmetry was realized using two identical rolls, driven by independent motors, rotating with different angular velocities ω1 and ω2. This ensured a wide range of rolling asymmetry: A=ω1/ω2. It was found that a strong shear stress induced in the asymmetrically rolled material allowed to obtain a microstructure refinement, texture homogenization and lowering of residual stress.

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Andrzej Baczmanski

AGH University of Science and Technology

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S. Dymek

AGH University of Science and Technology

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K. Wierzbanowski

AGH University of Science and Technology

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Sebastian Wroński

AGH University of Science and Technology

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M. Blicharski

AGH University of Science and Technology

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Chedly Braham

Arts et Métiers ParisTech

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M. Wroński

AGH University of Science and Technology

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Marianna Marciszko

AGH University of Science and Technology

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Wilfrid Seiler

Arts et Métiers ParisTech

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Roman Wawszczak

AGH University of Science and Technology

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