Effect of single-step strain and annealing on grain boundary character distribution and intergranular corrosion in Alloy 690 |
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Authors: | Shuang Xia Bangxin Zhou Wenjue Chen |
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Affiliation: | (1) Institute of Materials, Shanghai University, Shanghai, 200072, P.R. China |
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Abstract: | The effects of single-step thermomechanical treatments on the grain boundary character distribution (GBCD) and intergranular
corrosion of Alloy 690 (Ni–30Cr–10Fe, wt.%) are investigated. High proportion of low ΣCSL grain boundaries (more than 70%
according to Palumbo–Aust criterion) associating with large size grains-cluster microstructure is obtained through one-step
thermomechanical treatment of 5% cold rolling followed by annealing at 1,100 °C for 5 min. Nucleation density of recrystallization
and multiple twinning are the key factors affecting the GBCD. The grains-cluster is produced by multiple twinning starting
from a single recrystallization nucleus. That the mean size of the grains-clusters and proportion of low ΣCSL boundaries decrease
with the increasing strain, is caused by the increasing nucleation density of recrystallization with the increase of strain.
The specimen with large size grains-cluster microstructure and high proportion of low ΣCSL boundaries exhibits much better
resistance to mass loss during intergranular corrosion testing than that with small size grains-cluster microstructure and
relatively low proportion of low ΣCSL boundaries. |
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Keywords: | |
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