Author:
Cui Yiran,Yang Zhongbo,Zhang Wei,Liu Hong
Abstract
AbstractZirconium alloys are extensively used in nuclear fuel element cladding tube, guide tube and positioning spacer grid and other reactor core structural materials because of their excellent nuclear properties. The preparation of these profiles includes ingot forging, β-phase heat treatment, hot and cold deformation processing and other processes. Among them, The β-phase heat treatment process significantly affects the microstructure and processability of zirconium alloys forging billets. OM, SEM and TEM were used to study the microstructure of Zr-0.85Sn-1Nb-0.3Fe alloy forging ingot samples after β-phase heat treatment at (950–1150 °C)/(15 min–2 h), and water quenching. The results indicated that under different heat treatment conditions, typical acicular shape martensitic microstructure appears in Zr-Sn-Nb-Fe alloy after water quenching. The size of martensitic laths increased with the extension of holding time, which showed that the length and width of the small part of the acicular martensite away from the forging plane both increased significantly; on this basis, the effects of β-phase heat treatment temperature and holding time on the phase transformation behavior of the alloy were analyzed.
Publisher
Springer Nature Singapore
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