The effect of a molten nitrate salt environment on the mechanical properties of INCOLOY Alloy 800. [60% NaNO3-40% KNO3]

Journal Article · Wed Jun 01 04:00:00 EDT 1983 · J. Mater. Energy Syst.; (United States)

DOI:https://doi.org/10.1007/BF02833504· OSTI ID:5370214

Goods, S H

The influence of an oxidizing molten nitrate salt environment (60 pct NaNO/sub 3/-40 pct KNO/sub 3/) on the mechanical properties of INCOLOY Alloy 800 has been examined through a series of slow strain rate tensile tests. Fracture strain, reduction in area and ultimate tensile strength were monitored as parameters indicative of alloy susceptibility to environmental degradation. For strain rates between 2 X 10/sup -7/ sec/sup -1/ and 3.34 X 10/sup -5/ sec/sup -1/ no appreciable loss in ductility as measured by the above parameters was observed at 600/sup 0/C relative to control specimens tested in air at the same strain rates and temperature. Similarly, the load-bearing capability of the alloy was unaffected by exposure to the environment. The structure of the oxide film formed by contact of the alloy with the molten salt was affected by the imposed continuous deformation. Deformation resulted in an oxide which was thicker than that formed on undeformed salt-exposed surfaces. While this difference in oxide thickness was a measurable phenomenon, the increased rate of oxidation was not great enough to alter appreciably alloy mechanical behavior in the salt compared to that measured in air over the time limits considered. In addition, fine subsurface cracks were observed in those oxides formed on deformed surfaces.

• Research Organization: Sandia National Laboratories, P.O. Box 969, Livermore, CA 94550
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5370214
• Journal Information: J. Mater. Energy Syst.; (United States), Journal Name: J. Mater. Energy Syst.; (United States) Vol. 5:1; ISSN JMSMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CORROSIVE EFFECTS
DEFORMATION
DIMENSIONS
ENVIRONMENT
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MOLTEN SALTS
NICKEL ALLOYS
NITRATES
NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
SALTS
SODIUM COMPOUNDS
SODIUM NITRATES
STRAINS
TENSILE PROPERTIES
THICKNESS