ANSTO authored conference papers, presentations, posters and abstracts https://apo.ansto.gov.au/dspace/handle/10238/9 2021-02-23T05:04:53Z 2021-02-23T05:04:53Z Olsen, SR Gilbert, EP Booth, N Pullen, SA Imperia, P Peterson, VK Garbe, U Luzin, V Paradowska, AM Studer, AJ Liss, KD https://apo.ansto.gov.au/dspace/handle/10238/10424 2021-02-16T05:55:46Z 2014-01-01T00:00:00Z

Title: Novel non destructive sample analysis techniques using neutron scattering Authors: Olsen, SR; Gilbert, EP; Booth, N; Pullen, SA; Imperia, P; Peterson, VK; Garbe, U; Luzin, V; Paradowska, AM; Studer, AJ; Liss, KD Abstract: In late 2006 the new 20MW Open Pool Australian Light Water Reactor (OPAL) went critical for the first time. Since 2007 thousands of scientists and engineers have used the neutron beam instruments to perform a wide range of non-destructive studies of samples covering physics, chemistry, biology, engineering and materials science. Neutrons provide a wealth of information about the state of materials including structure, residual stress, magnetic properties and dynamic properties. As neutrons scatter from nuclei and not electrons, they are highly penetrating, capable of travelling tens of millimeters into most metals. Neutrons behave, for to some extent, like tiny bar magnets and therefore can be used to investigate the magnetic properties of materials such as superconductors and computor memories. Recent engineering studies - often undertaken in situ at industrially relevant conditions - include railway sleepers, turbine blades, polymer processing, lithium battery testing, and titanium alloys. © 2021 Informit

2014-01-01T00:00:00Z Kirkwood, HJ De Jonge, MD Howard, DL Ryan, CG Van Riessen, G Hofmann, F Rowles, MR Paradowska, AM Abbey, B https://apo.ansto.gov.au/dspace/handle/10238/10422 2021-02-16T05:52:08Z 2017-09-26T00:00:00Z

Title: Polycrystalline materials analysis using the Maia pixelated energy-dispersive X-ray area detector Authors: Kirkwood, HJ; De Jonge, MD; Howard, DL; Ryan, CG; Van Riessen, G; Hofmann, F; Rowles, MR; Paradowska, AM; Abbey, B Abstract: Elemental, chemical, and structural analysis of polycrystalline materials at the micron scale is frequently carried out using microfocused synchrotron X-ray beams, sometimes on multiple instruments. The Maia pixelated energy-dispersive X-ray area detector enables the simultaneous collection of X-ray fluorescence (XRF) and diffraction because of the relatively large solid angle and number of pixels when compared with other systems. The large solid angle also permits extraction of surface topography because of changes in self-absorption. This work demonstrates the capability of the Maia detector for simultaneous measurement of XRF and diffraction for mapping the short- and long-range order across the grain structure in a Ni polycrystalline foil. © International Centre for Diffraction Data 2017

2017-09-26T00:00:00Z Tremsin, AS Kockelmann, W Paradowska, AM Zhang, SY Korsunsky, AM Shinohara, T Feller, WB Lehmann, EH https://apo.ansto.gov.au/dspace/handle/10238/10420 2021-02-16T10:14:42Z 2016-01-01T00:00:00Z

Title: Investigation of microstructure within metal welds by energy resolved neutron imaging Authors: Tremsin, AS; Kockelmann, W; Paradowska, AM; Zhang, SY; Korsunsky, AM; Shinohara, T; Feller, WB; Lehmann, EH Abstract: The recent development of bright pulsed neutron sources and high resolution neutron counting detectors enables simultaneous acquisition of a neutron transmission spectrum for each pixel of the image. These spectra can be used to reconstruct microstructure parameters within welds, such as strain, texture and phase composition through Bragg edge analysis, and in some cases elemental composition through resonance absorption analysis. In this paper we demonstrate the potential of energy-resolved neutron imaging to study the microstructures of two steel welds, where the spatial distribution of residual strain within the welds, as well as some information on the texture, are obtained with sub-mm spatial resolution. A friction stir weld of two steel plates and a conventional weld of two steel pipes were studied at pulsed neutron facilities, where a Δλ/λ resolution as low as 0.2% can be attained over a wide range of neutron wavelengths ranging from 0.5 Å to 8 Å. Creative Commons Attribution 3.0 licence © Copyright 2021 IOP Publishing

2016-01-01T00:00:00Z Salehi, I Khodabakhshi, B Mutton, PJ Paradowska, AM https://apo.ansto.gov.au/dspace/handle/10238/10419 2021-02-16T04:22:17Z 2014-01-01T00:00:00Z

Title: Aluminothermic welding of rails: Improved qualification and performance under heavy haul conditions Authors: Salehi, I; Khodabakhshi, B; Mutton, PJ; Paradowska, AM Abstract: Aluminothermic welding continues to be used widely throughout the rail industry, due to its low capital cost and flexibility of use. A range of weld types are available from the two manufacturers who support the Australian market; these vary in terms of collar design, preheating conditions, etc. Single-use crucibles, which are now commonly used, have overcome some of the inherent disadvantages of multi-use crucibles. However the reliability of aluminothermic welds continues to be lower than that of flashbutt welds, particularly under heavy haul conditions where aluminothermic welds are responsible for the majority of rail defects and broken rails. Failure modes in aluminothermic welds can vary depending on the characteristics of the individual weld type and the service conditions, although the majority of failures are associated with fatigue cracking at the top or underside of the rail foot. Other failure modes include fatigue cracking in either web or underhead regions; these modes are strongly dependent on the weld collar design and residual stress levels. Qualification requirements for aluminothermic welds in the current Australian standard include mandatory fatigue testing of the rail foot, and an optional web fatigue test which is generally applied when approving welding procedures for some heavy haul conditions. At present there is no established test procedure for fatigue of the underhead region. Several concurrent activities being undertaken with the support of both consumable manufacturers and some heavy haul rail systems, in conjunction with the Australian Nuclear Science and Technology Organisation (ANSTO), aimed at improving the reliability of aluminothermic welds. These include neutron diffraction measurement of residual stress levels in the critical regions of the weld collar, development of a fatigue test methodology for the underhead region, and an enhanced welder training and audit program which provides the opportunity to address any issues with consumables or equipment in a timely manner. © 2021 Informit

2014-01-01T00:00:00Z