Compatibility of ferritic steels in a sodium environment. [Carburization-decarburization at 550 to 700/sup 0/C]

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7273736

Chopra, O K; Natesan, K; Kassner, T F

Kinetics of carburization-decarburization of three commercial and two high-purity ferritic steels with chromium and molybdenum contents in the range 9-12 wt percent and 1-2 wt percent, respectively, was studied in a sodium environment at temperatures between 550 and 700/sup 0/C. Carbon concentration-distance profiles obtained as a function of sodium-exposure time and temperature showed that the steels carburized below 650/sup 0/C and decarburized at higher temperatures. The carburization-decarburization behavior of the ferritic steels was compared with that of the 2/sup 1///sub 4/Cr--1Mo ferritic and Type 304 stainless steels. Microstructural examination of sodium-exposed specimens revealed that the atom ratio of molybdenum to carbon in the steel had a significant effect on the stability of the carbide structure in equilibrium with the ferrite matrix. Nitrogen transfer from the commercial 9Cr--2Mo steel to the sodium environment occurred at temperatures between 550 and 700/sup 0/C. (auth)

• Research Organization: Argonne National Lab., Ill. (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7273736
• Report Number(s): CONF-760503-11
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METALS
ALLOYS
CARBON ADDITIONS
CARBURIZATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CHROMIUM-NICKEL STEELS
COMPARATIVE EVALUATIONS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRYSTAL STRUCTURE
DECARBURIZATION
DEPTH
DIMENSIONS
ELEMENTS
FERRITE
FLUIDS
HARDENING
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
LIQUID METALS
LIQUIDS
METALS
MICROSTRUCTURE
NICKEL ALLOYS
REACTION KINETICS
SODIUM
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
SURFACE HARDENING
SURFACE TREATMENTS
TEMPERATURE DEPENDENCE