https://sam.ensam.eu:443 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sat, 18 Apr 2026 23:19:51 GMT 2026-04-18T23:19:51Z http://hdl.handle.net/10985/8956 Determination of composition, residual stress and stacking fault depth profiles in expanded austenite with energy-dispersive diffraction CHRISTIANSEN, T.L.; KLAUS, Manuela; GENZEL, Christoph; SOMERS, M.A.J.; JÉGOU, Sébastien A methodology is proposed combining the scattering vector method with energy dispersive diffraction for the non-destructive determination of stress- and composition-depth profiles. The advantage of the present method is a relatively short measurement time and avoidance of tedious sublayer removal; the disadvantage as compared to destructive methods is that depth profiles can only be obtained for depth shallower than half the layer thickness. The proposed method is applied to an expanded austenite layer on stainless steel and al- lows the separation of stress, composition and stacking fault density gradients. Tue, 01 Jan 2013 00:00:00 GMT http://hdl.handle.net/10985/8956 2013-01-01T00:00:00Z CHRISTIANSEN, T.L. KLAUS, Manuela GENZEL, Christoph SOMERS, M.A.J. JÉGOU, Sébastien A methodology is proposed combining the scattering vector method with energy dispersive diffraction for the non-destructive determination of stress- and composition-depth profiles. The advantage of the present method is a relatively short measurement time and avoidance of tedious sublayer removal; the disadvantage as compared to destructive methods is that depth profiles can only be obtained for depth shallower than half the layer thickness. The proposed method is applied to an expanded austenite layer on stainless steel and al- lows the separation of stress, composition and stacking fault density gradients. 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/10985/24793 Stress evolution in plastically deformed austenitic and ferritic steels determined using angle- and energy-dispersive diffraction MARCISZKO-WIACKOWSKA, M; BACZMANSKI, Andrzej; BRAHAM, Chedly; WATROBA, M.; WRONSKI, Sebastian; WAWSZCZAK, R.; GONZALEZ, Gonzalo; KOT, Piotr; KLAUS, Manuela; GENZEL, Christoph In the presented research, the intergranular elastic interaction and the second-order plastic incompatibility stress in textured ferritic and austenitic steels were investigated by means of diffraction. The lattice strains were measured inside the samples by the multiple reflection method using high energy X-rays diffraction during uniaxial in situ tensile tests. Comparing experiment with various models of intergranular interaction, it was found that the Eshelby-Kr¨oner model correctly approximates the X-ray stress factors (XSFs) for different reflections hkl and scattering vector orientations. The verified XSFs were used to investigate the evolution of the first and second-order stresses in both austenitic and ferritic steels. It was shown that considering only the elastic anisotropy, the non-linearity of sin2ψ plots cannot be explained by crystallographic texture. Therefore, a more advanced method based on elastic-plastic self-consistent modeling (EPSC) is required for the analysis. Using such methodology the non-linearities of cos2φ plots were explained, and the evolutions of the first and second-order stresses were determined. It was found that plastic deformation of about 1–2% can completely exchange the state of second-order plastic incompatibility stresses. Thu, 01 Jun 2023 00:00:00 GMT http://hdl.handle.net/10985/24793 2023-06-01T00:00:00Z MARCISZKO-WIACKOWSKA, M BACZMANSKI, Andrzej BRAHAM, Chedly WATROBA, M. WRONSKI, Sebastian WAWSZCZAK, R. GONZALEZ, Gonzalo KOT, Piotr KLAUS, Manuela GENZEL, Christoph In the presented research, the intergranular elastic interaction and the second-order plastic incompatibility stress in textured ferritic and austenitic steels were investigated by means of diffraction. The lattice strains were measured inside the samples by the multiple reflection method using high energy X-rays diffraction during uniaxial in situ tensile tests. Comparing experiment with various models of intergranular interaction, it was found that the Eshelby-Kr¨oner model correctly approximates the X-ray stress factors (XSFs) for different reflections hkl and scattering vector orientations. The verified XSFs were used to investigate the evolution of the first and second-order stresses in both austenitic and ferritic steels. It was shown that considering only the elastic anisotropy, the non-linearity of sin2ψ plots cannot be explained by crystallographic texture. Therefore, a more advanced method based on elastic-plastic self-consistent modeling (EPSC) is required for the analysis. Using such methodology the non-linearities of cos2φ plots were explained, and the evolutions of the first and second-order stresses were determined. It was found that plastic deformation of about 1–2% can completely exchange the state of second-order plastic incompatibility stresses.