Effect of loading rate and thermal aging on the fracture toughness of stainless steel alloys
The effect of loading rate on the fracture toughness of Types 304 and 316 stainless steel plate and Type 308 weld before and after thermal aging at elevated temperature was characterized using both fracture mechanics and Charpy specimens. Aging at 566/sup 0/C for 10,000 hours reduced static j/sub c/ values for both wrought and weld metals by 10 to 20%, and tearing moduli were reduced by 20 to 30%. Under semi-dynamic and dynamic loading conditions, the fracture resistance was not decreased below the static response for either unaged or aged materials. The present results also demonstrated that the large degradation in Charpy V-notch impact energy after aging, as reported in this and other studies, was not representative of the impact resistance for SS components containing cracks or crack-like defects. Fractographic examinations revealed that the large loss in Charpy energy was associated with aging-induced microstructural changes that substantially decreased the energy required to initiate a crack from a blunt notch. At very slow strain rates, creep crack growth was found to cause a significant degradation in fracture toughness. 25 refs., 17 figs., 2 tabs.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76FF02170
- OSTI ID:
- 6041845
- Report Number(s):
- HEDL-SA-3474-FP; CONF-870697-2; ON: DE87014377
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
AGING
ALLOYS
CHARPY TEST
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CREEP
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
FRACTOGRAPHY
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
LOADING RATE
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
STAINLESS STEEL-304
STAINLESS STEEL-308
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TESTING