The new materials science diffractometer STRESS-SPEC at FRM-II

Hofmann, M.; Schneider, Ralf; Seidl, Günter; Rebelo-Kornmeier, Joana; Wimpory, Robert C.; Garbe, Ulf; Brokmeier, Heinz Günter

doi:10.1016/j.physb.2006.05.331

Cited by 129 publications

(69 citation statements)

References 1 publication

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“…Measurements were made using three instruments: SALSA at the ILL, Grenoble (Pirling et al, 2006), Stress-Spec at FRM II, Munich (Hofmann et al, 2006) and E3 at HZB, Berlin (Boin et al, 2014). All of these instruments are monochromatic beam diffractometers which use constant wavelength neutron beams.…”

Section: Neutron Diffractionmentioning

confidence: 99%

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

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Residual stress measurements have been made in a range of electron beam welded samples to study how the weld induced residual stresses redistributed during fabrication of compact tension, C(T), specimens. The samples were manufactured from Type 316H stainless steel in the ex-service material condition and in material which had been preconditioned by inducing 8% plastic strain. Measurements made using neutron diffraction, slitting and the contour method were generally in good agreement and showed residual stress components of up to three times the base material's yield strength existed in the samples. When sectioning a sample to perform the contour method, large elastic deformations occurred at the cut tip due to the large residual stresses present. A correction was applied to the measured surface displacements to account for this deformation. Neutron diffraction measurements were made at various stages of the fabrication process, which showed significant stress redistribution occurred as the welded samples were machined into C(T) specimens.However the tensile stresses near the crack tip of the C(T) specimens remained large and could significantly influence subsequent crack growth tests. Highlights Electron beam welding is shown to produce repeatable residual stress fields in thick samples

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Section: Neutron Diffractionmentioning

confidence: 99%

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Kapadia

Davies

Pirling

et al. 2017

International Journal of Solids and Structures

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“…Diffraction studies of -UMo samples during in situ annealing were performed on the materials science diffractometer STRESS-SPEC at the FRM II (Hofmann et al, 2006). For the experiment, a germanium monochromator Ge(311) and a 1.065 m distance to the sample were chosen.…”

Section: In Situ Annealing Studiesmentioning

confidence: 99%

Neutron and hard X-ray diffraction studies of the isothermal transformation kinetics in the research reactor fuel candidate U–8 wt%Mo

et al. 2016

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Exposing uranium–molybdenum alloys (UMo) retained in the γ phase to elevated temperatures leads to transformation reactions during which the γ-UMo phase decomposes into the thermal equilibrium phases,i.e.U2Mo and α-U. Since α-U is not suitable for a nuclear fuel exposed to high burn-up, it is necessary to retain the γ-UMo phase during the production process of the fuel elements for modern high-performance research reactors. The present work deals with the isothermal transformation kinetics in U–8 wt%Mo alloys for temperatures between 673 and 798 K and annealing durations of up to 48 h. Annealed samples were examined at room temperature using either X-ray or neutron diffraction to determine the phase composition after thermal treatment, andin situannealing studies disclosed the onset of phase decomposition. While for temperatures of 698 and 673 K the start of decomposition is delayed, for higher temperatures the first signs of transformation are already observable within 3 h of annealing. The typical C-shaped curves in a time–temperature–transformation (TTT) diagram for both the start and the end of phase decomposition could be determined in the observed temperature regime. Therefore, a revised TTT diagram for U–8 wt%Mo between 673 and 798 K and annealing durations of up to 48 h is proposed.

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“…Residual stress analysis (Hofmann et al, 2006) • Industrial components • Welds • Superalloys • Strain mapping • Surface measurements from 150 µm possible (Šaroun et al, 2013) Texture determination (Brokmeier et al, 2011) • A positioning system consisting of a Stäubli-6-axes robotic arm for texture and strain measurements (payload up to 30 kg) can be mounted instead of the standard sample table (see Figure 2). It o ers more exibility than an Eulerian cradle and can be also used as automatic sample changer for texture measurements (Randau et al, 2015).…”

Section: Typical Applicationsmentioning

confidence: 99%

STRESS-SPEC: Materials science diffractometer

Hofmann

Gan

Rebelo-Kornmeier

2015

JLSRF

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In response to the development of new materials and the application of materials and components in new technologies the direct measurement, calculation and evaluation of textures and residual stresses has gained worldwide signi cance in recent years. STRESS-SPEC, the materials science di ractometer, which is jointly operated by the Technische Universität München, the Institute of Materials Science and Engineering, Technische Universität Clausthal and by GEMS, Helmholtz-Zentrum Geesthacht, is located at the thermal beam port SR-3 of the FRM II and can easily be con gured either for texture analysis or strain measurements.

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The new materials science diffractometer STRESS-SPEC at FRM-II

Cited by 129 publications

References 1 publication

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Quantification of residual stresses in electron beam welded fracture mechanics specimens

Neutron and hard X-ray diffraction studies of the isothermal transformation kinetics in the research reactor fuel candidate U–8 wt%Mo

STRESS-SPEC: Materials science diffractometer

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