MYTHEN Detector – Perspectives in Residual Stress Measurements

Jung, Dubravka Šišak; Suominen, Lasse; Parantainen, Jari; Hoermann, C.

doi:10.4028/www.scientific.net/amr.996.203

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…In industry, materials and products are often inspected and tested with X-rays. The characterization of residual stress of metal parts is important to detect fatigue before failure [69]. Different types of plastics need to be separated to ensure effective recycling [70].…”

Section: Discussionmentioning

confidence: 99%

Transforming X-ray detection with hybrid photon counting detectors

Förster¹,

Brandstetter²,

Schulze-Briese³

2019

Phil. Trans. R. Soc. A.

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Hybrid photon counting (HPC) detectors have radically transformed basic research at synchrotron light sources since 2006. They excel at X-ray diffraction applications in the energy range from 2 to 100 keV. The main reasons for their superiority are the direct detection of individual photons and the accurate determination of scattering and diffraction intensities over an extremely high dynamic range. The detectors were first adopted in macromolecular crystallography where they revolutionized data collection. They were soon also used for small-angle scattering, coherent scattering, powder X-ray diffraction, spectroscopy and increasingly high-energy applications. Here, we will briefly survey the history of HPC detectors, explain their technology and then show in detail how improved detection has transformed a wide range of experimental techniques. We will end with an outlook to the future, which will probably see HPC technology find even broader use, for example, in electron microscopy and medical applications. This article is part of the theme issue ‘Fifty years of synchrotron science: achievements and opportunities’.

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Section: Discussionmentioning

confidence: 99%

Transforming X-ray detection with hybrid photon counting detectors

Förster¹,

Brandstetter²,

Schulze-Briese³

2019

Phil. Trans. R. Soc. A.

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“…1). In the CuKα measurements Mythen detectors were used due to their better sensitivity and a threshold energy capability to decrease the fluorescence radiation [11]. There is a small difference in the stress levels of Grade 5 (Fig.…”

Section: Figure 1 Sample Dimensions [Mm]mentioning

confidence: 99%

Residual Stress Measurement of Ti-Metal Samples by Means of XRD with Ti and Cu Radiation

Suominen

Rickert

Send³

2016

Residual Stresses 2016

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Abstract:The use of titanium in structural components has been growing for years, especially in highly demanding applications in the aerospace industry where quality control is essential. One of the critical properties is fatigue strength, which is strongly affected by residual stresses. Residual stresses may be an unavoidable by-product of the manufacturing process or intentionally imparted through processes like shot peening. X-ray diffraction (XRD) is commonly used for residual stress measurement. Yet titanium alloys are more difficult to measure than other metals like steels and aluminium alloys. Many titanium alloys have a two-phase microstructure, one of them being hexagonal alpha titanium. Also, the commonly used Cu-radiation generates very strong fluorescence, which results in a low penetration depth. Both reduces measurement quality. Ti-radiation is much less frequently used. It benefits from very low fluorescence and a higher penetration depth. This paper compares XRD residual stress measurements using Cu-and Ti-radiation on two titanium grades: Grade 2 and Grade 5 (Ti6Al4V). The samples from both are in the rolled condition and have been shot peened. The x-ray elastic constants were determined by XRD with Cu-and Ti-radiation and samples and residual stress depth distributions were measured up to 0.5 mm depth. IntroductionTitanium alloys are widely used in aerospace structures due to their excellent strength to weight ratio. For aerospace applications reliability is critical from which follows that all factors affecting the performance of the components have to be studied and controlled extremely well. One important factor is residual stress, which is always present due to the manufacturing processes and which affects fatigue strength significantly. Titanium alloys are challenging because their machining is difficult due to their high chemical reactivity, poor thermal conductivity, high strength that is maintained at elevated temperatures and low modulus of elasticity [1]. The same factors make welding challenging. Since productivity is always an important issue it is always attempted to minimize the need for machining and welding [2,3].For the evaluation of titanium components, reliable, fast and easy residual stress measurement is a key issue. There are several methods for measuring residual stresses nondestructively and destructively. This paper deals with X-ray diffraction, using X-ray instruments specifically designed for residual stress measurement. The measurement accuracy depends on a number of factors, such as grain size, preferred orientation, accessibility of measurement location etc. The X-ray wavelength is given by the X-ray tube chosen. It is preferable to select it so that the 2θ -angle of the diffraction peak analyzed is the highest possible that has sufficient intensity. However, some combinations of material and radiation cause significant fluorescence, which affects the net intensity level and also the effective measurement depth [3]. X-ray diffraction does not measure stress directl...

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