BASIC PRINCIPLES OF THE DIFFUSION OF CARBON IN IRON

Journal Article · Sun Jan 01 04:00:00 EST 1961 · Metalloved. i Termicheskaya Obrabotka Metal

OSTI ID:4071699

Bokshtein, S Z; Kontorovich, I E; Moroz, L M

Studies by radioisotopic techniques, surface effects, and the location of grain boundaries cause definite nonuniform behavior in the diffusion process in metals. During the diffusion of carbon in alpha - and gamma -iron between 550 and 950 deg C, the carbon had the tendency of becoming enriched at the grain boundary as a result of the great difference between the diffusion coefficients at the boundary and within the grain. Alloying additions changed the diffusion rate and the character of the carbon distribution within the metal. Elements that attached themselves to the gamma -region enhanced the depth of the penetration of carbon at the expense of the boundary type diffusion; as a result, the concentration difference between tbe boundary region and the body of the grain was smaller in the alloyed ferrite than in the unalloyed iron. The tests were performed by covering the surface of the metal under study with BaCO/sub 3/ containing C/sup 14/ and detecting the diffusion rate by autoradiography. (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-15-013404
• OSTI ID: 4071699
• Journal Information: Metalloved. i Termicheskaya Obrabotka Metal, Journal Name: Metalloved. i Termicheskaya Obrabotka Metal Vol. Vol: No. 1
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ABSORPTION
ALLOYS
BARIUM CARBONATES
CARBON
DETECTION
DIFFUSION
DISTRIBUTION
ENRICHMENT
ENVIRONMENT
GRAIN BOUNDARIES
IRON
IRON OXIDES
METALS
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
QUANTITY RATIO
RADIOGRAPHY
RADIOISOTOPES
STANDARDS
SURFACE TENSION
TEMPERATURE
TESTING
THICKNESS