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E3
Residual Stress Analysis and Texture Diffractometer
Instrument description
The diffractometer is designed for strain and stress analysis for simple geometric samples as well as for industrial applications and heavy tools. The diffractometer itself consists of two big omega circles (Ω and 2Θ) with a diameter of 800 mm and upon a translation table (xyz-direction) for sample positioning in vertical and horizontal direction. This set up is installed for handling heavy and/or large samples and components such as impellers or turbines with diameters of up to half a meter and loads up to 300 kg. A range of equipment for sample positioning is available, such as a closed Eulerian cradle for samples with weights of up to 5 kg, a second cradle for heavy samples (up to 50 kg) with the ability to tilt the samples up to 90° and a translation table carrying samples up to 300 kg and 1000 mm in diameter. Gauge volumes can be adjusted by a computer controlled variable slit-system in a range from 1x1x1 mm3 up to several mm3. Rapid data visualization as well as evaluation is performed by the specially designed software TVtueb and SteCa.
Applications
- Residual stress analysis on monocrystalline or polycrystalline materials and machine components
- In-situ residual stress analysis within industrial components during mechanical or thermal loading (up to 2000 K)
- Texture measurements using Eulerian cradles
Selected examples
Among the components that were investigated are crankshafts, impellers, pistons, cylinder heads, turbine blades and welds for example.
Instrument layout
| Instrument Data | |
|---|---|
| Beam tube | T2 |
| Collimation | open |
| Monochromator | Si (400), double focussing |
| Take off angle of monochromator | 65° |
| Wave length | 0.1486 nm |
| Flux | ~ 5·106 n/cm2s |
| Range of scattering angles | 35° ≤ 2Θ ≤ 110° |
| FWHM standard powder | ~ 0.3 (at 2Θ= 90°) |
| Detector | PSD 30x30 cm2 |
| Resolution | Δd/d ≈ 1.4·10‐3 |
| Sample to detector distance | 600 to 1300 mm |
| Beam size at sample | min: 0.5 x 0.5 mm2 max: 6 x 20 mm2 |
| Maximum sample size | 0.5 m diameter |
| Scan range | |
| Polarized neutrons | no |
| Instrument options | • Texture option • Slit systems available: from 0.5mm x 0.5mm to serveral mm • Radial collimator (soon) |
| Sample environment | • xyz table for max. 300 kg • various Eulerian cradles |
| Software | SteCa, TVtueb (analysis), CARESS (instrument control) |
Instrument Upgrades
- Monochromator upgrade: A set of perfectly bent Si (400) crystals providing a neutron wavelength of 0.1486 nm focusses on the sample. Thus the E3 has become faster and more adaptable to different types of measurement.
- Electronics upgrade: New motor control system detector electronic have been implemented providing a reliable and modular interface between instrument and the CARESS control software
- Radial collimator: An oscillating collimator secondary optic is to be implemented to improve the instrument resolution.
Additional information
In order to apply for beamtime on E3 please visit our User Info website.
We are looking forward to your experiment proposals.
