Slow-strain-rate testing of 2. 25Cr-1Mo in molten-nitrate salt. [450 AND 520/sup 0/C]
The influence of an oxidizing molten-nitrate salt (60% NaNO/sub 3/-40% KNO/sub 3/) on the mechanical properties of 2.25Cr-1Mo has been examined through a series of slow-strain-rate tests at 450/sup 0/C and 525/sup 0/C. By comparing fracture strain, reduction in area, and the ultimate strength of air-exposed specimens to these same parameters for specimens tested in the binary-salt mixture, the susceptibility of the alloy to environmental degradation could be ascertained. Exposure to the nitrate resulted in a loss of ductility as measured by either the engineering fracture strain or reduction in area at both temperatures studied. At these temperatures, the ductility loss was most pronounced at the lowest strain rates (1 x 10/sup -7/ sec/sup -1/). In general, for all strain rates examined, the degree of ductility loss was greater at 525/sup 0/C than at 450/sup 0/C. Metallographic observations revealed that severe surface oxidation occurred as the result of exposure to the molten salt. These surface scales were found to be nonadherent and easily spalled. The rapid formation of these corrosion products and the inability of the material to form a protective barrier against further oxidation is consistent with the ductility loss observed in the salt-exposed specimens. 22 figures.
- Research Organization:
- Sandia National Labs., Livermore, CA (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6164552
- Report Number(s):
- SAND83-8214; ON: DE83011894
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360106 -- Metals & Alloys-- Radiation Effects
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CORROSION PRODUCTS
CSP
Concentrating Solar Power
DATA
DUCTILITY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HIGH TEMPERATURE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLOGRAPHY
MOLTEN SALTS
NITRATES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDATION
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
SALTS
SODIUM COMPOUNDS
SODIUM NITRATES
STEELS
STRAIN RATE
TENSILE PROPERTIES
360103* -- Metals & Alloys-- Mechanical Properties
360106 -- Metals & Alloys-- Radiation Effects
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CORROSION PRODUCTS
CSP
Concentrating Solar Power
DATA
DUCTILITY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HIGH TEMPERATURE
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLOGRAPHY
MOLTEN SALTS
NITRATES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDATION
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
SALTS
SODIUM COMPOUNDS
SODIUM NITRATES
STEELS
STRAIN RATE
TENSILE PROPERTIES