Abstract
Tube pressurization tests were conducted on two lots of Zircaloy-2 cladding to compare iodine stress corrosion cracking (SCC) susceptibilities at ~593°K and an iodine concentration of 10 −4 g/cm 2. Since a substantial difference in SCC behavior was observed in as-received material, a test matrix was devised to separate the effects of crystallographic texture, heat treatment, residual stress, and surface finish on SCC susceptibility. The difference in time to failure as a function of stress between the two lots is due to the substantial difference in texture where a more tangential texture results in shorter times to failure at any stress. Chemical etching and stress-relief heat treatment temperature has little effect on SCC behavior while residual stress at the levels measured in the two lots has no effect. The role of texture in the iodine SCC is discussed in terms of texture effects on mechanical properties, crack initiation, and crack propagation. It is concluded that texture influences all of these processes.
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