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Stress corrosion cracking of rotor steels in carbonate/bicarbonate and sodium hydroxide solutions Rechberger, Johann
Abstract
In this study, the stress corrosion behavior of 3.5%NiCrMoV and 1%CrMoV steels was investigated. Tests were conducted at 95°C in carbonate/bicarbonate and sodium hydroxide solutions. Results from slow strain rate tensile tests and fracture mechanics experiments were compared. A new, easily machinable, specimen geometry for fracture mechanics experiments was tested. The influence of pH, potential, microstructure and inclusions were studied. Stress corrosion cracking (SCC) was found with all three steels in the 3.5M NaOH solution at active, passive and transpassive potentials. In the 1M carbonate/ bicarbonate solutions, the 1%CrMoV steels showed very severe cracking only during slow strain rate experiments. No major difference in cracking behavior was found between a regular 3.5%NiCrMoV steel and a super clean 3.5%NiCrMoV steel with low Mn and Si content. In acidic CO₂/H₂O environments, crack tip blunting was observed due to strong dissolution processes.
Item Metadata
Title |
Stress corrosion cracking of rotor steels in carbonate/bicarbonate and sodium hydroxide solutions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1986
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Description |
In this study, the stress corrosion behavior of 3.5%NiCrMoV and 1%CrMoV steels was investigated. Tests were conducted at 95°C in carbonate/bicarbonate and sodium hydroxide solutions. Results from slow strain rate tensile tests and fracture mechanics experiments were compared. A new, easily machinable, specimen geometry for fracture mechanics experiments was tested. The influence of pH, potential, microstructure and inclusions were studied.
Stress corrosion cracking (SCC) was found with all three steels in the 3.5M NaOH solution at active, passive and transpassive potentials. In the 1M carbonate/
bicarbonate solutions, the 1%CrMoV steels showed very severe cracking only during slow strain rate experiments. No major difference in cracking behavior was found between a regular 3.5%NiCrMoV steel and a super clean 3.5%NiCrMoV steel with low Mn and Si content. In acidic CO₂/H₂O environments, crack tip blunting was observed due to strong dissolution processes.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-07-11
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0078565
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URI | |
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Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.