The starting points of TGSCC of carbon steel in high temperature, high purity, oxygenated water were observed as the first step in a quantitative evaluation of the TGSCC initiation lifetime which progresses from corrosion pit initiation to TGSCC initiation. The following observations were made: (1) Carbon steel base metals show TGSCC susceptibility in 288°C water containing 8 ppm of dissolved oxygen. The TGSCC susceptibility in carbon steels has a dependence on microstructures. (2) Cracks are initiated from the bottom of a corrosion pit. The pearlite structures in the matrix act as the "origin" of corrosion pits. (3) A pearlite size of over about 200 μm2 is needed for TGSCC initiation in high temperature, high purity, oxygenated water. (4) About a 15% strain is needed for TGSCC initiation in the test environment of 250°C water containing 8ppm of dissolved oxygen.

Subject
Steel structures, Water, Crack initiation, Corrosion initiation, Fracture surfaces, Transgranular stress corrosion cracking, Base metals, Pearlite, Pitting, Dissolved oxygen, Carbon steel, Weld metal, High temperature
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1994
Association for Materials Protection and Performance (AMPP)
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