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
- Resource Relation:
- Conference: 20. ASTM's national fracture mechanics conference: prospectives and directions, Leheigh, PA, USA, 23 Jun 1987; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STAINLESS STEEL-304
FRACTURE PROPERTIES
STAINLESS STEEL-308
STAINLESS STEEL-316
AGING
CHARPY TEST
CREEP
FRACTOGRAPHY
HIGH TEMPERATURE
LOADING RATE
MICROSTRUCTURE
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
STAINLESS STEELS
STEELS
TESTING
360103* - Metals & Alloys- Mechanical Properties