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Uphill quenching to reduce residual stress in aluminium alloy 7449 hollow structures

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dc.contributor.author Robinson, J.S.
dc.contributor.author O'Donovan, A.
dc.contributor.author Wimpory, R.C.
dc.date.accessioned 2022-03-29T09:17:54Z
dc.date.available 2022-03-29T09:17:54Z
dc.date.issued 2022
dc.identifier.uri http://hdl.handle.net/10344/11151
dc.description peer-reviewed en_US
dc.description.abstract Background Uphill quenching (UHQ) of heat treatable aluminium alloy components is a long established but rarely practiced or investigated method of reducing residual stresses. The efficacy of the technique has not been quantified on thin walled structures before and this investigation will address that deficiency. Objective To quantify the impact of uphill quenching on thin walled structure with regards to residual stress and warpage, and compare and contrast to both quenching into cold water and a 30% polyalkylene glycol (PAG) solution. Methods Rectilinear hollow boxes were made from the very high strength aerospace aluminium alloy 7449. These were heat treated and aged using a variety of processing methods including uphill quenching from -196 °C to 100 °C using steam. Residual stresses have been characterised using neutron and x-ray diffraction. Results Compared to conventional quenching into cold water, both PAG and UHQ are shown to significantly lower the residual stresses. However, while PAG quenching results in a large uniform reduction in both residual stress and warpage, UHQ is much more localised and limited to regions adjacent to direct steam impingement. These regions are also warped. The depth of penetration of the stress relief during UHQ is shown to be 5mm. Conclusions While uphill quenching is shown to be capable of locally stress relieving an aluminium alloy, it is far less effective compared to PAG quenching. en_US
dc.language.iso eng en_US
dc.publisher Springer en_US
dc.relation.ispartofseries Experimental Mechanics;
dc.subject Aluminium alloy 7449 en_US
dc.subject Heat treatment en_US
dc.subject Residual stress en_US
dc.title Uphill quenching to reduce residual stress in aluminium alloy 7449 hollow structures en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1007/s11340-022-00836-8
dc.contributor.sponsor IReL Consortium en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US


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