Stress corrosion crack growth in NiCrMoV turbine disc steels
Journal Article
·
· Corrosion (Houston); (United States)
The effects of metallurgical and environmental variables on stress corrosion crack growth rates in NiCrMoV turbine disc steels is examined. Steels with yield strengths of 627-1124 MPa were tested at 157 C in either pure water environments or in environments containing the ionic contaminants NaCl and NaOH and gaseous contaminants, such as air, oxygen, and carbon dioxide. The chemical composition of the metals tested and the test procedures are described. Maximum crack growth rates of all the materials in each environment are presented. The results revealed that yield strength, temper embrittlement, and the composition of the environment influence crack growth rate; however, the composition of the alloy is only significant in specific environments. Two proposed damage mechanisms for environmentally assisted cracking in low alloy steels, anodic dissolution and hydrogen embrittlement, are discussed. 28 references.
- Research Organization:
- Southwest Research Institute, San Antonio, TX
- OSTI ID:
- 5635367
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 41; ISSN CORRA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
AIR
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION
CRACK PROPAGATION
ELEMENTS
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
METALS
MOLYBDENUM
NICKEL ALLOYS
NICKEL STEELS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
STEELS
TRANSITION ELEMENTS
VANADIUM
360103* -- Metals & Alloys-- Mechanical Properties
AIR
ALKALI METAL COMPOUNDS
ALLOYS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION
CRACK PROPAGATION
ELEMENTS
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
METALS
MOLYBDENUM
NICKEL ALLOYS
NICKEL STEELS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM HYDROXIDES
STEELS
TRANSITION ELEMENTS
VANADIUM