Environmentally assisted cracking of 3.5NiCrMoV low alloy steel under cyclic straining
- Mitsubishi Heavy Industries, Ltd., Takasago (Japan)
- Chubu Electric Power Co., Inc., Nagoya (Japan). Electric Power R and D Center
Environmentally assisted cracking of 3.5NiCrMoV low alloy steel under cyclic straining was investigated in water environments at 60 C. Effects of strain range, strain rate, strain hold tie and impurities in the water on the crack initiation life were investigated. The effects of long strain hold time up to 100 hours were studied and found to be especially significant. Lower strain rate, longer strain hold time and higher electric conductivity resulted in shorter crack initiation life. The corrosion current from the strained metal was measured in a simulated electrochemical system to clarify the root cause of the life reduction. Test results showed that higher strain range, lower strain rate, longer strain hold time and higher electric conductivity caused increased charge transfer, which caused shorter crack initiation life. A prediction model for the crack initiation life was proposed based on the charge transfer.
- OSTI ID:
- 548515
- Report Number(s):
- CONF-960588-; ISBN 0-8031-2408-2; TRN: IM9750%%71
- Resource Relation:
- Conference: American Society for Testing and Materials (ASTM) symposium on effects of the environment and the initiation of crack growth, Orlando, FL (United States), 20-21 May 1996; Other Information: PBD: 1997; Related Information: Is Part Of Effects of the environment on the initiation of crack growth; Van Der Sluys, W.A.; Piascik, R.S.; Zawierucha, R. [eds.]; PB: [310] p.; ASTM special technical publication 1298
- Country of Publication:
- United States
- Language:
- English
Similar Records
Environmentally assisted cracking of low pressure steam turbine disk-rim material
An investigation into the effects of cyclic strain rate on the high cycle and very high cycle fatigue behaviors of wrought and additively manufactured Inconel 718