PRECIPITATION OF THE CARBIDE PHASE IN CARBON STEELS

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Zavodskaya Lab.

OSTI ID:4146175

Gardin, A I

Investigation of the carbide phase that precipitated out in carbon steels during a low-temperature heat treatment, using N. M. Popova's electron- diffraction method (Zavodskaya Lab. 11, 10(1945)), showed that a disturbingly high background confuses the values. Interferometric studies showed that during annealing below 400 deg C a surface layer containing impurities is formed which makes it impossible to study the carbide phase formed during the decomposition of the austenite. In order to eliminate this difficulty, the carbide phase was precipitated during electrolysis of the sample in a nonaqaeous electrolyte containing 5% FeC1/sub 3/ in metheyl alcohol and citric acid, using a current density of 0.01 to 0.02 amp/cm/sup 2/ at -8 deg C. Electron-diffraction studies indicated that the deposit formed was free from lmpurities. It was established that in annealing the eutectoid steel at 350 deg C, two phases are obtained: one with a close-packed hexagonal lattice and another having a structure similar to that of cementite, although with different coordinates for the iron and carbon atoms. (TTT)

• Research Organization: All-Union Scientific Research Inst. for Instrumentation, USSR
• NSA Number: NSA-15-003138
• OSTI ID: 4146175
• Journal Information: Zavodskaya Lab., Journal Name: Zavodskaya Lab. Vol. Vol: 26
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALCOHOLS
ANNEALING
ATOMS
AUSTENITE
BACKGROUND
CARBIDES
CARBON
CARBON STEELS
CEMENTS
CITRIC ACID
CONFIGURATION
DECOMPOSITION
DENSITY
DIFFRACTION
ELECTRIC CHARGES
ELECTROLYSIS
ELECTROLYTES
ELECTRONS
EUTECTICS
HEAT TREATMENTS
IMPURITIES
IRON
IRON CHLORIDES
LATTICES
LAYERS
LOW TEMPERATURE
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
METHYL RADICALS
PHASE DIAGRAMS
PRECIPITATION
SAMPLING
STEELS
SURFACES
TEMPERATURE
WATER