Fatigue-crack growth rates of A 508-2 steel in pressurized, high-temperature water. [PWR]
Fatigue crack growth rates were determined for A 508-2 steel in pressurized, high-temperature, reactor-grade water, for a variety of ramp time and hold time combinations as well as sinusoidal waveforms. Tests were conducted for load ratios of 0.1 to 0.2, and at temperatures of 93/sup 0/C and 288/sup 0/C (200/sup 0/F and 550/sup 0/F). The results indicate that the trends in crack growth rates are dependent on both waveform and temperature. There is an increase in crack growth rates at low temperatures (93/sup 0/C) for ramp times greater than one second, but the crack growth rates are essentially the same for ramp times ranging from 22 to 1800 seconds. Crack growth rates at high temperatures (288/sup 0/C) are essentially independent of ramp time over a range of 1 second to 300 seconds; all data reside just above the ASME air environment reference line. On the other hand, 17 mHz sinusoidal waveforms and 288/sup 0/C temperatures produced a significant increase in crack growth rates. There is some evidence that this behavior is a function of material chemistry, particularly sulfur content.
- Research Organization:
- Materials Engineering Associates, Inc., Lanham, MD (USA)
- OSTI ID:
- 6017700
- Report Number(s):
- NUREG/CR-3294; MEA-2016; ON: DE83902246
- Country of Publication:
- United States
- Language:
- English
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210200* -- Power Reactors
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Light-Water Moderated
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBON STEELS
CHEMISTRY
CONTAINERS
CRACKS
FATIGUE
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
PIPES
PRESSURE VESSELS
PWR TYPE REACTORS
REACTOR MATERIALS
REACTORS
STEEL-ASTM-A508
STEEL-ASTM-A533-B
STEELS
TEMPERATURE DEPENDENCE
WATER CHEMISTRY
WATER COOLED REACTORS
WATER MODERATED REACTORS