THE EFFECT OF COBALT ON THE PROPERTIES OF CHROMIUM STEELS

Journal Article · Fri Jul 01 04:00:00 EDT 1960 · Mem. sci. rev. met.

OSTI ID:4162787

Coutsouradis, D; Habraken, L

Alloys were prepared with the currently used carbon and chromium contents. The effect of low cobalt additions (up to 10 per cent) was studied. By studying specimens heattreated for long periods, using metallographic, x-ray, and carbide extraction methods, the phases present in equilibrium for various temperatures were determined. A number of diagrams show sections with two constant variables (chromium and carbon, or temperature and cobalt, or carbon and cobalt): it is seen that, whereas the influence of the cobalt on the solidus and liquidus and the transformation of the carbides is negligible, the gamma radiation effect of the cobalt becomes more marked as the chromium content is increased. Also studied was the effect of low cobalt additions in some currently used chromium steels with 13. 18. and 27% of chromium. In all the steels studied, the tensile strength is increased by solution treatment or in direct prcportion to the gamma radiation effect of the cobalt. Further, the behavior of these steels is studied as regards temper brittleness at 475 deg C and the formation of the delta phase. The corrosion resistance of the steels was investigated by immersion tests with sulfuric acid and boiling nitric acid and by electrochemical tests. The cobalt is found to have a favorable influence. (auth)

• Research Organization: C.N.R.M., Liege
• NSA Number: NSA-14-023341
• OSTI ID: 4162787
• Journal Information: Mem. sci. rev. met., Journal Name: Mem. sci. rev. met. Vol. Vol: 57
• Country of Publication: Country unknown/Code not available
• Language: French

Related Subjects

ALLOYS
BOILING
BRITTLENESS
CARBIDES
CARBON
CHROMIUM
COBALT
CORROSION
DIAGRAMS
ELECTROCHEMISTRY
ENRICHMENT
GAMMA RADIATION
HEAT TREATMENTS
LIQUIDS
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
NITRIC ACID
PHASE DIAGRAMS
REACTION KINETICS
SOLIDS
STEELS
SULFURIC ACID
TEMPERATURE
TENSILE PROPERTIES
TESTING
USES
X RADIATION