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| Stress Corrosion Crack Initiation for Scratched Alloy 690TT in Oxygenated High Temperature Water |
| MENG Fanjiang1, WANG Jianqiu2, HAN En-Hou2, KE Wei2 |
1. Shanghai Nuclear Engineering Research and Design Institute，Shanghai，200233，China;
2. Institute of Metal Research，Chinese Academy of Sciences，Shenyang，110016，China |
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Abstract The stress corrosion crack (SCC) initiation of Alloy 690TT was studied by using scratch technique in oxygenated water at 325 ℃. The SEM results show that intergranular stress corrosion cracks were initiated at the bottom of the scratch groove，and the relevant mechanism was discussed. Mechanical cracks which were produced during slow strain rate tensile stage and tips ofthem highly approached to or were along grain boundaries，could be the precursor for stress corrosion crack initiation and growth in the following constant loading stage. Therefore，Alloy 690TT is susceptible to stress corrosion cracking in high temperature oxygenated water.
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