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A study of the static recrystallization behaviour of cast Alloy 825 after hot-compressions

By Munir Al-Saadi, Fredrik Sandberg, Christopher Hulme-Smith, Andrey Karasev and Pär Jönsson


The static recrystallization behaviour of a columnar and equiaxed Alloy 825 material was studied on a Gleeble-3800 thermo-simulator by single-hit compression experiments. Deformation temperatures of 1000-1200 °C, a strain of up to 0.8, a strain rate of 1s-1, and relaxation times of 30, 180, and 300 s were selected as the deformation conditions to investigate the effects of the deformation parameters on the SRX behaviour. Furthermore, the influences of the initial grain structures on the SRX behaviors were studied. The microstructural evolution was studied using optical microscopy and EBSD. The EBSD measurements showed a relaxation time of 95 % for fractional recrystallization grains, 95, in both structures, was less than 30 seconds at the deformation temperatures 1100 °C and 1200 °C. However, fewer than 95% of recrystallized grains recrystallized when the deformation temperature was lowered to 1000 °C. From the grain-boundary misorientation distribution in statically recrystallized samples, the fraction of high-angle grain boundaries decreased with an increasing deformation temperature from 1000 °C to 1200 °C for a given relaxation time. This was attributed to grain coarseningQC 20190916</p

Topics: Alloy 825, Static recrystallization, hot compression, Gleeble-3800 thermo simulator, Metallurgy and Metallic Materials, Metallurgi och metalliska material
Publisher: 'IOP Publishing'
Year: 2019
DOI identifier: 10.1088/1742-6596/1270/1/012023
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