https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sat, 06 Jun 2026 20:18:30 GMT 2026-06-06T20:18:30Z http://hdl.handle.net/10985/9914 Investigation of plastic deformation heterogeneities in duplex steel by EBSD WRONSKI, Sebastian; TARASIUK, J; BACROIX, Brigitte; BACZMANSKI, Andrzej; BRAHAM, Chedly An EBSD analysis of a duplex steel (austeno-ferritic) deformed in tension up to fracture is presented. The main purpose of the paper is to describe, qualitatively and quantitatively, the differences in the behavior of the two phases during plastic deformation. In order to do so, several topological maps are measured on the deformed state using the electron backscatter diffraction technique. Distributions of grain size, misorientation, image quality factor and texture are then analyzed in detail. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/9914 2012-01-01T00:00:00Z WRONSKI, Sebastian TARASIUK, J BACROIX, Brigitte BACZMANSKI, Andrzej BRAHAM, Chedly An EBSD analysis of a duplex steel (austeno-ferritic) deformed in tension up to fracture is presented. The main purpose of the paper is to describe, qualitatively and quantitatively, the differences in the behavior of the two phases during plastic deformation. In order to do so, several topological maps are measured on the deformed state using the electron backscatter diffraction technique. Distributions of grain size, misorientation, image quality factor and texture are then analyzed in detail. http://hdl.handle.net/10985/8134 Application of multireflection grazing incidence method for stress measurements in polished Al–Mg alloy and CrN coating MARCISZKO, Marianna; BACZMANSKI, Andrzej; WIERZBANOWSKI, K; WROBEL, Mirosław; CHOPART, J.-P.; LODINI, A; BONARSKI, J; TARKOWSKI, L.; ZAZI, N; BRAHAM, Chedly Multi-reflection grazing incidence geometry, referred to as MGIXD, characterized by a small and constant incidence angle, was applied to measure low surface stresses in very thin layers of Al–Mg alloy and CrN coating. These two materials were selected in order to deal with the low and high levels of residual stress, respectively. The influence of different mechanical treatments on residual stresses was studied for Al–Mg samples. It was found that both rolling and mechanical polishing influence the distribution and amplitude of residual stress in surface layers. In the case of CrN coating, a very high compressive stress was generated during the deposition process. The stress distributions determined by the MGIXD method is in good agreement with the classic sin2 technique results for all studied samples. In performing stress measurements for a powder sample, it was found that the application of the Göbel mirror in the incident beam strongly reduces statistical and misalignment errors. Additionally, the root mean square values of the third order lattice strain within diffracting grains were determined. Sun, 01 Jan 2012 00:00:00 GMT http://hdl.handle.net/10985/8134 2012-01-01T00:00:00Z MARCISZKO, Marianna BACZMANSKI, Andrzej WIERZBANOWSKI, K WROBEL, Mirosław CHOPART, J.-P. LODINI, A BONARSKI, J TARKOWSKI, L. ZAZI, N BRAHAM, Chedly Multi-reflection grazing incidence geometry, referred to as MGIXD, characterized by a small and constant incidence angle, was applied to measure low surface stresses in very thin layers of Al–Mg alloy and CrN coating. These two materials were selected in order to deal with the low and high levels of residual stress, respectively. The influence of different mechanical treatments on residual stresses was studied for Al–Mg samples. It was found that both rolling and mechanical polishing influence the distribution and amplitude of residual stress in surface layers. In the case of CrN coating, a very high compressive stress was generated during the deposition process. The stress distributions determined by the MGIXD method is in good agreement with the classic sin2 technique results for all studied samples. In performing stress measurements for a powder sample, it was found that the application of the Göbel mirror in the incident beam strongly reduces statistical and misalignment errors. Additionally, the root mean square values of the third order lattice strain within diffracting grains were determined. http://hdl.handle.net/10985/7977 Effect of interlamellar spacing on the elastoplastic behavior of C70 pearlitic steel: Experimental results and self-consistent modeling YAHYAOUI, Houda; SIDHOM, H; BACZMANSKI, Andrzej; BRAHAM, Chedly The effect of pearlite microstructure characteristics on strength and deformation of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stress induced by plasticity. Tests have been carried out on two pearlitic microstructures with interlamellar spacing Sp = 170 and 230 nm respectively. Ferrite critical shear stresses ðs0c ðaÞÞ are equal to 75–86 MPa for interlamellar spacing Sp = 230 nm and 105–120 MPa for interlamellar spacing Sp = 170 nm. Moreover, the compressive residual stress measured in ferrite phase is higher in elasto-plastically deformed sample (total strain of E11 = 1.2%) having larger interlamellar spacing (rR Fea ¼ 161 MPa for Sp = 230 nm and rR Fea ¼ 77 MPa for Sp = 170 nm). Wed, 01 Jan 2014 00:00:00 GMT http://hdl.handle.net/10985/7977 2014-01-01T00:00:00Z YAHYAOUI, Houda SIDHOM, H BACZMANSKI, Andrzej BRAHAM, Chedly The effect of pearlite microstructure characteristics on strength and deformation of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stress induced by plasticity. Tests have been carried out on two pearlitic microstructures with interlamellar spacing Sp = 170 and 230 nm respectively. Ferrite critical shear stresses ðs0c ðaÞÞ are equal to 75–86 MPa for interlamellar spacing Sp = 230 nm and 105–120 MPa for interlamellar spacing Sp = 170 nm. Moreover, the compressive residual stress measured in ferrite phase is higher in elasto-plastically deformed sample (total strain of E11 = 1.2%) having larger interlamellar spacing (rR Fea ¼ 161 MPa for Sp = 230 nm and rR Fea ¼ 77 MPa for Sp = 170 nm). http://hdl.handle.net/10985/9846 Problem of elastic anisotropy and stacking faults in stress analysis using multireflection grazing-incidence X-ray diffraction MARCISZKO, Marianna; BACZMANSKI, Andrzej; MIROSŁAW, Wrobel; SEILER, Wilfrid; WRONSKI, Sebastian; WAWSZCZAK, Roman; BRAHAM, Chedly 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. Thu, 01 Jan 2015 00:00:00 GMT http://hdl.handle.net/10985/9846 2015-01-01T00:00:00Z MARCISZKO, Marianna BACZMANSKI, Andrzej MIROSŁAW, Wrobel SEILER, Wilfrid WRONSKI, Sebastian WAWSZCZAK, Roman BRAHAM, Chedly 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. http://hdl.handle.net/10985/11657 Stress measurements by multi-reflection grazing-incidence X-ray diffraction method (MGIXD) using different radiation wavelengths and different incident angles MARCISZKO, Marianna; BACZMANSKI, Andrzej; WROBEL, Mirosław; WRONSKI, Sebastian; CIOS, Grzegorz; BRAHAM, Chedly The presented study introduces the development of the multi-reflection grazing-incidence X-ray diffraction method (MGIXD) for residual stress determination. The proposed new methodology is aimed at obtaining more reliable experimental data and increasing the depth of non-destructive stress determination below the sample surface. To verify proposed method measurements were performed on a classical X-ray diffractometer (Cu Kα radiation) and using synchrotron radiation (three different wavelengths: λ = 1.2527 Å, λ = 1.5419 Å and λ = 1.7512 Å). The Al2017 alloy subjected to three different surface treatments was investigated in this study. The obtained results showed that the proposed development of MGIXD method, in which not only different incident angles but also different wavelengths of X-ray are used, can be successfully applied for residual stress determination, especially when stress gradients are present in the sample. Sun, 01 Jan 2017 00:00:00 GMT http://hdl.handle.net/10985/11657 2017-01-01T00:00:00Z MARCISZKO, Marianna BACZMANSKI, Andrzej WROBEL, Mirosław WRONSKI, Sebastian CIOS, Grzegorz BRAHAM, Chedly The presented study introduces the development of the multi-reflection grazing-incidence X-ray diffraction method (MGIXD) for residual stress determination. The proposed new methodology is aimed at obtaining more reliable experimental data and increasing the depth of non-destructive stress determination below the sample surface. To verify proposed method measurements were performed on a classical X-ray diffractometer (Cu Kα radiation) and using synchrotron radiation (three different wavelengths: λ = 1.2527 Å, λ = 1.5419 Å and λ = 1.7512 Å). The Al2017 alloy subjected to three different surface treatments was investigated in this study. The obtained results showed that the proposed development of MGIXD method, in which not only different incident angles but also different wavelengths of X-ray are used, can be successfully applied for residual stress determination, especially when stress gradients are present in the sample. http://hdl.handle.net/10985/14077 A multireflection and multiwavelength residual stress determination method using energy dispersive diffraction MARCISZKO, Marianna; WAWSZCZAK, Roman; SIDHOM, Habib; WROBEL, Mirosław; WRONSKI, Sebastian; OPONOWICZ, Adrian; GENZEL, Christoph; KLAUS, Manuela; BACZMANSKI, Andrzej; BRAHAM, Chedly The main focus of the presented work was the investigation of structure and residual stress gradients in the near-surface region of materials studied by X-ray diffraction. The multireflection method was used to measure depth-dependent stress variation in near-surface layers of a Ti sample (grade 2) subjected to different mechanical treatments. First, the multireflection grazing incidence diffraction method was applied on a classical diffractometer with Cu Kα radiation. The applicability of the method was then extended by using a white synchrotron beam during an energy dispersive (ED) diffraction experiment. An advantage of this method was the possibility of using not only more than one reflection but also different wavelengths of radiation. This approach was successfully applied to analysis of data obtained in the ED experiment. There was good agreement between the measurements performed using synchrotron radiation and those with Cu Kα radiation on the classical diffractometer. A great advantage of high-energy synchrotron radiation was the possibility to measure stresses as well as the a0 parameter and c0/α0 ratio for much larger depths in comparison with laboratory X-rays. © 2018 International Union of Crystallography. Mon, 01 Jan 2018 00:00:00 GMT http://hdl.handle.net/10985/14077 2018-01-01T00:00:00Z MARCISZKO, Marianna WAWSZCZAK, Roman SIDHOM, Habib WROBEL, Mirosław WRONSKI, Sebastian OPONOWICZ, Adrian GENZEL, Christoph KLAUS, Manuela BACZMANSKI, Andrzej BRAHAM, Chedly The main focus of the presented work was the investigation of structure and residual stress gradients in the near-surface region of materials studied by X-ray diffraction. The multireflection method was used to measure depth-dependent stress variation in near-surface layers of a Ti sample (grade 2) subjected to different mechanical treatments. First, the multireflection grazing incidence diffraction method was applied on a classical diffractometer with Cu Kα radiation. The applicability of the method was then extended by using a white synchrotron beam during an energy dispersive (ED) diffraction experiment. An advantage of this method was the possibility of using not only more than one reflection but also different wavelengths of radiation. This approach was successfully applied to analysis of data obtained in the ED experiment. There was good agreement between the measurements performed using synchrotron radiation and those with Cu Kα radiation on the classical diffractometer. A great advantage of high-energy synchrotron radiation was the possibility to measure stresses as well as the a0 parameter and c0/α0 ratio for much larger depths in comparison with laboratory X-rays. © 2018 International Union of Crystallography. http://hdl.handle.net/10985/15917 Elastoplastic deformation and damage process in duplex stainless steels studied using synchrotron and neutron diffractions in comparison with a self-consistent model BACZMANSKI, Andrzej; ZHAO, Yuchen; GADALIŃSKA, E; LE JONCOUR, Léa; WROŃSKI, Sebastian; PANICAUD, Benoît; FRANÇOIS, Manuel; BUSLAPS, Thomas; SOLODUCHA, K.; BRAHAM, Chedly In situ time of flight neutron diffraction and X-ray synchrotron diffraction methods were applied to measure lattice strains in duplex steels during a tensile test. The experimental results were used to study slips on crystallographic planes and the mechanical effects of damage occurring during plastic deformation. For this purpose the prediction of an elastoplastic self-consistent model was compared with the experimental data. The used methodology allowed to determine the elastic limits and parameters describing work hardening in both phases of studied polycrystalline materials. In the second part of this work the developed elastoplastic model was applied to study damage occurring in the ferritic phase. The theoretical results showed a significant reduction of stresses localized in the damaged phase (ferrite) and confirmed the evolution of the lattice strains measured in the ferritic and austenitic phases. Fri, 01 Jan 2016 00:00:00 GMT http://hdl.handle.net/10985/15917 2016-01-01T00:00:00Z BACZMANSKI, Andrzej ZHAO, Yuchen GADALIŃSKA, E LE JONCOUR, Léa WROŃSKI, Sebastian PANICAUD, Benoît FRANÇOIS, Manuel BUSLAPS, Thomas SOLODUCHA, K. BRAHAM, Chedly In situ time of flight neutron diffraction and X-ray synchrotron diffraction methods were applied to measure lattice strains in duplex steels during a tensile test. The experimental results were used to study slips on crystallographic planes and the mechanical effects of damage occurring during plastic deformation. For this purpose the prediction of an elastoplastic self-consistent model was compared with the experimental data. The used methodology allowed to determine the elastic limits and parameters describing work hardening in both phases of studied polycrystalline materials. In the second part of this work the developed elastoplastic model was applied to study damage occurring in the ferritic phase. The theoretical results showed a significant reduction of stresses localized in the damaged phase (ferrite) and confirmed the evolution of the lattice strains measured in the ferritic and austenitic phases. http://hdl.handle.net/10985/17927 Damage in duplex steels studied at mesoscopic and macroscopic scales LE JONCOUR, Léa; PANICAUD, Benoît; BACZMANSKI, Andrzej; FRANÇOIS, Manuel; PARADOWSKA, Anna Maria; WROŃSKI, Sebastian; CHIRON, Rémi; BRAHAM, Chedly Different experimental approaches have been performed in order to extract damage at several scales. In this paper two experimental methods are treated. Neutron diffraction coupled with tensile test has been performed to study damage at mesoscopic scale. At macroscopic scale, classical tensile test has been used to extract damage effects, from material hardening evolution. Optical measurements and particular data treatment have been used in order to correct data for the necking phenomenon at large deformation, for each experimental method. Damage process in duplex steels has then been analysed at both macroscopic and mesoscopic scales using scale transition models. Eventually, investigations at those scales have been compared to understand correlation between mesoscopic and macroscopic behaviour of our material. Fri, 01 Jan 2010 00:00:00 GMT http://hdl.handle.net/10985/17927 2010-01-01T00:00:00Z LE JONCOUR, Léa PANICAUD, Benoît BACZMANSKI, Andrzej FRANÇOIS, Manuel PARADOWSKA, Anna Maria WROŃSKI, Sebastian CHIRON, Rémi BRAHAM, Chedly Different experimental approaches have been performed in order to extract damage at several scales. In this paper two experimental methods are treated. Neutron diffraction coupled with tensile test has been performed to study damage at mesoscopic scale. At macroscopic scale, classical tensile test has been used to extract damage effects, from material hardening evolution. Optical measurements and particular data treatment have been used in order to correct data for the necking phenomenon at large deformation, for each experimental method. Damage process in duplex steels has then been analysed at both macroscopic and mesoscopic scales using scale transition models. Eventually, investigations at those scales have been compared to understand correlation between mesoscopic and macroscopic behaviour of our material. http://hdl.handle.net/10985/17319 Multireflection grazing incidence diffraction used for stress measurementsin surface layers MARCISZKO, M; WROBEL, M; SEILER, W; DONGES, J; SNIECHOWSKI, M; WIERZBANOWSKIA, K; BACZMANSKI, Andrzej; BRAHAM, Chedly The geometry based on the multireflection grazing incidence X-ray diffraction can be applied to measure residual stresses. Using this method, it is possible to perform a non-destructive analysis of the heterogeneous stresses for different and well defined volumes below the surface of the sample (range of several μm). As the result, the average values of stresses weighted by absorption of X-ray radiation are measured. In this work the stress profiles as a function of penetration depth were determined for mechanically polished Al sample. Measurements and verification of the method were performed using classical X-ray diffractometer and synchrotron radiation with different wavelengths. Tue, 01 Jan 2013 00:00:00 GMT http://hdl.handle.net/10985/17319 2013-01-01T00:00:00Z MARCISZKO, M WROBEL, M SEILER, W DONGES, J SNIECHOWSKI, M WIERZBANOWSKIA, K BACZMANSKI, Andrzej BRAHAM, Chedly The geometry based on the multireflection grazing incidence X-ray diffraction can be applied to measure residual stresses. Using this method, it is possible to perform a non-destructive analysis of the heterogeneous stresses for different and well defined volumes below the surface of the sample (range of several μm). As the result, the average values of stresses weighted by absorption of X-ray radiation are measured. In this work the stress profiles as a function of penetration depth were determined for mechanically polished Al sample. Measurements and verification of the method were performed using classical X-ray diffractometer and synchrotron radiation with different wavelengths. http://hdl.handle.net/10985/17932 Multireflection grazing-incidence X-ray diffraction: A new approach to experimental data analysis MARCISZKO-WIĄCKOWSKA, Marianna; OPONOWICZ, Adrian; BACZMANSKI, Andrzej; WRÓBEL, Mirosław X.; WAWSZCZAK, Roman; BRAHAM, Chedly The multireflection grazing-incidence X-ray diffraction method is used to test surface stresses at depths of several micrometres in the case of metal samples. This work presents new ways of analysing experimental data obtained by this method for Ni samples exhibiting significant elastic anisotropy of crystals. Three different methods of determining biaxial stresses and lattice parameter were compared. In the first approach, the calculations were performed using the linear least-squares method, and then two simplified procedures based on simple linear regression (weighted and non-weighted) were applied. It was found that all the tested methods give similar results, i.e. almost equal values of the determined stresses and lattice parameters and the uncertainties of their determination. The advantage of analyses based on simple linear regression is their simplicity and straightforward interpretation, enabling easy verification of the influence of the crystallographic texture and the presence of shear stresses, as well as graphical determination of the stress-free lattice parameter. Tue, 01 Jan 2019 00:00:00 GMT http://hdl.handle.net/10985/17932 2019-01-01T00:00:00Z MARCISZKO-WIĄCKOWSKA, Marianna OPONOWICZ, Adrian BACZMANSKI, Andrzej WRÓBEL, Mirosław X. WAWSZCZAK, Roman BRAHAM, Chedly The multireflection grazing-incidence X-ray diffraction method is used to test surface stresses at depths of several micrometres in the case of metal samples. This work presents new ways of analysing experimental data obtained by this method for Ni samples exhibiting significant elastic anisotropy of crystals. Three different methods of determining biaxial stresses and lattice parameter were compared. In the first approach, the calculations were performed using the linear least-squares method, and then two simplified procedures based on simple linear regression (weighted and non-weighted) were applied. It was found that all the tested methods give similar results, i.e. almost equal values of the determined stresses and lattice parameters and the uncertainties of their determination. The advantage of analyses based on simple linear regression is their simplicity and straightforward interpretation, enabling easy verification of the influence of the crystallographic texture and the presence of shear stresses, as well as graphical determination of the stress-free lattice parameter.