Browsing by Author "Mark, R"

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    Neutron diffraction residual stress determinations on Intermetallic alloy components produced by wire-arc additive manufacturing (WAAM)
    (Australian Institute of Nuclear Science and Engineering (AINSE), 2018-11-01) Chen, S; Ma, Y; Li, HJ; Mark, R; Paradowska, AM
    Intermetallic alloys such as aluminides of titanium, nickel and iron exhibit an attractive combination of physical and mechanical properties such as high melting point, low density, high strength, good oxidation, and creep resistance, due to their strong internal order and mixed bonding. However, the properties of these materials are often obtained at a cost in terms of ease of manufacturing. In recent years the WAAM process has been successfully applied to in-situ produce TiAl and Fe3Al intermetallic components with designed chemical compositions. One of the major concern is residual stresses (RS) distribution in the WAAM fabricated components as it not only influences the part tolerance but also cause premature failure. The neutron diffraction technique has been recognised as the most precise and reliable method of mapping sub-surface RS in components for both academic and industrial-economic relevance. Considering the outstanding capability of obtaining RS non-destructively deep within the interior of components, our study utilised neutron diffraction technique to conduct RS measurement by the angular scanning instrument KOWARI. Furthermore, an averaging method has been developed for the WAAM multi-bead build up intermetallic alloys with large grain size. With the averaging method applied during experimental setup and data processing, reasonable residual stress results have been obtained from the acquired neutron diffraction data.
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    Upgrades and improvements to the Kowari residual strain scan
    (Australian Institute of Nuclear Science and Engineering (AINSE), 2018-11-19) Mark, R
    This poster highlights some recent upgrades to the Kowari instrument. These include: A wireless cable free remote control for the sample stage allowing freer movement of the operator around the stage when positioning samples; A group of lasers for aligning the primary and secondary/radial collimators as well as allowing accurate positioning of the sample with respect to the primary neutron beam; A redesign of the detector shroud to greatly reduce the time taken to switch between the adjustable slit system and radial collimators. © The Authors.