RECRYSTALLIZATION DIAGRAM OF VANADIUM

Journal Article · Sat Jul 21 04:00:00 EDT 1962 · Doklady Akad. Nauk S.S.S.R.

OSTI ID:4767517

Savitskii, E M; Baron, V V; Efimov, Yu V

The grain size of vanadium is related to the degree of deformation and to the temperature of the subsequent annealing process. After purifying with cerium in an arc furnace with a nonconsumable tungsten electrode in an atmosphere of pure helium, the initial vanadium contained 0.07% oxygen, 0.21% carbon, 0.01% nitrogen, and about 0.2% metallic impurities. The vanadium was cold-rolled without breaking to a high degree of deformation. The metal was cold-rolled with a 50% reduction and annealed in vacuum for 1 hour in order to break up the large- grain structure. The average grain size was 63 mu after this treatment. Samples were cold-rolled with reductions of 5, 10. 15, 25, 50, 75, and 90% without an intermediate anneal. The hardness of the initial vanadium is 120 kg/ mm/sup 2/. and increases with increasing reduction (136 kg/mm/sup 2/ at 5% reduction, 156 kg/mm/sup 2/ at 25% reduction, and 165 kg/mm/sup 2/ at 50 to 95% reduction). The reduced samples were annealed in vacuum at 750 to 1300 deg C for one hour. The initial recrystallization temperature of vanadium decreases with increasing degree of deformation. It is 900 deg C at 5% reduction, 800 deg C at 50% reduction. and 775 deg C at 95% reduction. Recrystallization results in complete removal of the cold-rolled structure. The average grain size is about 20 mu . No increase in grain size is observed on annealing the cold-rolled samples at temperatures up to 1050 deg C, but a sharp increase in grain size is noted at 1100 deg C with the samples which had been reduced by 10%, and at 1200 deg C for the 15% reduced samples. The average grain size increases from 20 mu to 40 mu at an annealing temperature of 1200 deg C for the samples with 25% reduction. The optinium treatment of vanadium. which gives a fine-grained structure and good mechanical properties, is cold-rolling with a reduction of 50 to 955, and an anneal at a temperature of 850 to 1050 deg C in an inert atmosphere. (TTT)

• Research Organization: Baikov Inst. of Metallurgy, USSR
• NSA Number: NSA-16-030824
• OSTI ID: 4767517
• Journal Information: Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 145
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ANNEALING
CARBON
CERIUM
COLD WORKING
CONFIGURATION
DEFORMATION
DIAGRAMS
EFFICIENCY
ELECTRIC ARCS
ELECTRODES
FURNACES
GRAIN SIZE
HEAT TREATMENTS
HELIUM
HIGH TEMPERATURE
IMPURITIES
INERT GASES
MECHANICAL PROPERTIES
METALS
METALS, CERAMICS, AND OTHER MATERIALS
NITROGEN
OXYGEN
RECRYSTALLIZATION
ROLLING
SAMPLING
THICKNESS
TUNGSTEN
VACUUM
VANADIUM