Abstract
Microchemistry and microstructure of TiN in Alloy 690TT were analyzed using SEM and TEM. Constant loading test was conducted on Alloy 690TT in 325 °C water to study effect of TiN on SCC initiation. It was found that TiN-inclusion stringers existed along the longitudinal axis. Numerous micron-size TiN with Al 2O 3 and/or MgO nuclei and submicron-size TiN existed in this alloy. After holding a constant load equal to 180% of the yield strength for 40 days, cracks about 1–3 μm initiated at micron-size TiN and TiN-inclusion stringers in the near surface. The mechanisms of Alloy 690TT crack initiation at these TiN are discussed.
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