Observations on stress corrosion cracking initiation sites in carbon steel
- Hitachi Ltd. (Japan)
- Osaka Univ. (Japan). Welding Research Inst.
The starting points of transgranular stress corrosion cracking (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{mu}g m{sup 2} 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.
- OSTI ID:
- 70145
- Report Number(s):
- CONF-940222--
- Country of Publication:
- United States
- Language:
- English
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