NEUTRON DIFFRACTION MEASUREMENT OF AS-CAST RESIDUAL STRESSES IN AA7050 ROLLING PLATE INGOTS: INFLUENCE OF A WIPER

During casting, thermally induced deformations give birth to ingot distortions and residual stresses. For some high strength alloys, ingot cracking can happen during casting per se or during cooling down. Ingot distortions such as rolling face pull-in, but curl and but swell are rather easy to quantify as opposed to internal stresses. As aluminium is rather transparent to neutrons, residual stress measurements using neutron diffraction appeared to be a good way to validate the thermomechanical models aimed at simulating the stress build-up during casting. This technique has been applied to DC cast AA7050 rolling plate ingots with special attention to the stress generation in the transient start-up phase, i.e. in the foot of the ingot. Additional results using the hole drilling method complement the measurements. The measured stress distributions are compared with the results of a numerical model of DC casting for ingots cast with and without a wiper.


Editor(s):
Grandfield, John
Published in:
Light Metals 2014
Presented at:
Light Metals, TMS, 2014,, San Diego, USA, February 2014, 17th - 20th
Year:
2014
Publisher:
TMS, Warendale, USA, John Grandfield
Keywords:
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 Record created 2014-06-19, last modified 2018-09-13

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