Post-test examination of a pool boiler receiver
A subscale pool boiler test apparatus to evaluate boiling stability developed a leak after being operated with boiling NaK for 791.4 hr at temperatures from 700 to 750 {degrees}C. The boiler was constructed using Inconel 625 with a type 304L stainless steel wick for the boiler and type 316 stainless steel for the condenser. The boiler assembly was metallurgically evaluated to determine the cause of the leak and to assess the effects of the NaK on the materials. It was found that the leak was caused by insufficient (about 30 percent) joint penetration in a butt joint. There was no general corrosion of the construction materials, but the room temperature ductility of the Inconel 625 was only about 6.5 percent. A crack in the heat affected zone of the Inconel 625 near the Inconel 625 to type 316 stainless steel butt joint was probably caused by excessive heat input. The crack was observed to have a zone depleted of iron at the crack surface and porosity below that zone. The mechanism of the iron depletion was not conclusively determined. 3 refs.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AT04-85AL33408
- OSTI ID:
- 5180433
- Report Number(s):
- DOE/NASA-33408-6; NASA-TM-105635; ON: DE92015983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
INCONEL 625
SOLAR RECEIVERS
PERFORMANCE TESTING
STAINLESS STEEL-304
STAINLESS STEEL-316
WELDED JOINTS
LEAKS
LIQUID METALS
MECHANICAL PROPERTIES
POTASSIUM BASE ALLOYS
SODIUM ALLOYS
SOLAR THERMAL CONVERSION
STIRLING ENGINES
TEMPERATURE RANGE 0400-1000 K
ALLOY-NI61CR22MO9NB4FE3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CONVERSION
CORROSION RESISTANT ALLOYS
ELEMENTS
ENERGY CONVERSION
ENGINES
FLUIDS
HEAT ENGINES
HEAT RESIS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INCONEL ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIQUIDS
MATERIALS
METALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM AL
POTASSIUM ALLOYS
SOLAR ENERGY CONVERSION
STAINLESS STEELS
STEEL-CR17NI12MO3
STEEL-CR19NI10
STEELS
TEMPERATURE RANGE
TESTING
140700* - Solar Thermal Power Systems
141000 - Solar Collectors & Concentrators
360103 - Metals & Alloys- Mechanical Properties