TY  - JOUR
A1  - Laquai, René
A1  - Schaupp, Thomas
A1  - Griesche, Axel
A1  - Müller, Bernd R.
A1  - Kupsch, Andreas
A1  - Hannemann, Andreas
A1  - Kannengiesser, Thomas
A1  - Bruno, Giovanni
T1  - Quantitative analysis of hydrogen-assisted microcracking in duplex stainless steel through X-ray refraction 3D imaging
JF  - Advanced engineering materials
N2  - While the problem of the identification of mechanisms of hydrogen-assisted damage has and is being thoroughly studied, the quantitative analysis of such damage still lacks suitable tools. In fact, while, for instance, electron microscopy yields excellent characterization, the quantitative analysis of damage requires at the same time large field-of-views and high spatial resolution. Synchrotron X-ray refraction techniques do possess both features. Herein, it is shown how synchrotron X-ray refraction computed tomography (SXRCT) can quantify damage induced by hydrogen embrittlement in a lean duplex steel, yielding results that overperform even those achievable by synchrotron X-ray absorption computed tomography. As already reported in the literature, but this time using a nondestructive technique, it is shown that the hydrogen charge does not penetrate to the center of tensile specimens. By the comparison between virgin and hydrogen-charged specimens, it is deduced that cracks in the specimen bulk are due to the rolling process rather than hydrogen-assisted. It is shown that (micro)cracks propagate from the surface of tensile specimens to the interior with increasing applied strain, and it is deduced that a significant crack propagation can only be observed short before rupture.
KW  - 2101 duplex stainless steel
KW  - computed tomography
KW  - fractography
KW  - hydrogen
KW  - embrittlement
KW  - microcracking
KW  - synchrotron radiation
KW  - X-ray refraction
Y1  - 2022
U6  - https://doi.org/10.1002/adem.202101287
SN  - 1527-2648
VL  - 24
IS  - 6
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Vadilonga, Simone
A1  - Zizak, Ivo
A1  - Roshchupkin, Dmitry
A1  - Evgenii, Emelin
A1  - Petsiuk, Andrei
A1  - Leitenberger, Wolfram
A1  - Erko, Alexei
T1  - Observation of sagittal X-ray diffraction by surface acoustic waves in Bragg geometry
JF  - Journal of applied crystallography
N2  - X-ray Bragg diffraction in sagittal geometry on a Y-cut langasite crystal (La3Ga5SiO14) modulated by Lambda = 3 mu m Rayleigh surface acoustic waves was studied at the BESSY II synchrotron radiation facility. Owing to the crystal lattice modulation by the surface acoustic wave diffraction, satellites appear. Their intensity and angular separation depend on the amplitude and wavelength of the ultrasonic superlattice. Experimental results are compared with the corresponding theoretical model that exploits the kinematical diffraction theory. This experiment shows that the propagation of the surface acoustic waves creates a dynamical diffraction grating on the crystal surface, and this can be used for space-time modulation of an X-ray beam.
KW  - surface acoustic waves
KW  - optics
KW  - synchrotron radiation
KW  - sagittal X-ray diffraction
Y1  - 2017
U6  - https://doi.org/10.1107/S1600576717002977
SN  - 1600-5767
VL  - 50
SP  - 525
EP  - 530
PB  - International Union of Crystallography
CY  - Chester
ER  -