Study of crack growth under operational conditions in steam turbine steel: phase I report. Technical report 9
Fatigue crack growth and plane strain fracture toughness have been examined in three 1 Cr--Mo--V bainitic steam generator rotor steels. The effects of inclusion content, manufacturing processes, and repeated aging on the rate of subcritical crack growth at room temperature have been investigated using compact tension specimens. The impact properties of these steels above the temperature range of -62 - +100/sup 0/C have also been determined using both standard and precracked Charpy specimens. In addition the tensile properties above the temperature range of 0/sup 0/ to 538/sup 0/C have been evaluated using cylindrical tensile specimens. Variation in inclusion content, microstructure, yield and tensile strengths, and ductile to brittle transition temperature had no effect on the crack growth rate of 1 Cr--Mo--V rotor steels; brittle cleavage modes of fatigue were not observed in either continuous or intermittently strain aged specimens tested at ambient temperature. However, unstable cleavage crack extension can be initiated during cold starts if a sufficiently long crack is present.
- Research Organization:
- Failure Analysis Associates, Palo Alto, CA (USA)
- OSTI ID:
- 7125491
- Report Number(s):
- EPRI-NP-325
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRACKS
ELEMENTS
FAILURES
FRACTURE PROPERTIES
IMPACT STRENGTH
INSPECTION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
QUALITY ASSURANCE
RELIABILITY
ROTORS
STEAM TURBINES
STEELS
TENSILE PROPERTIES
TESTING
THERMAL POWER PLANTS
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRACKS
ELEMENTS
FAILURES
FRACTURE PROPERTIES
IMPACT STRENGTH
INSPECTION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
METALS
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
POWER PLANTS
QUALITY ASSURANCE
RELIABILITY
ROTORS
STEAM TURBINES
STEELS
TENSILE PROPERTIES
TESTING
THERMAL POWER PLANTS
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY