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THE INFLUENCE OF RATE OF HEATING ON TRANSFORMATIONS IN STEEL DURING TEMPERING (in Russian)

Journal Article · · Fiz. Metal. i Metalloved
OSTI ID:4221228
;
Dilatometric and x-ray-diffraction analysis and optical and microscopic studies were employed in determining siruciural changes taking place wiih fast- rate heating during high-carbon steel tempering in water at 1100 deg C. Graphs are plotted of phase transformation at heating rates of 2.7 x 10/sup -2/ to 9 x 10/sup 2/ deg /sec. The fast rate of heating depresses the first stage of transformation; the temperature of the first transition shifts when the heating rate exceeds approximately 500 deg /sec. First stage transition starts at 330 to 350 deg and 750 deg /sec; at 900 deg /sec it begins at 430 to 450 deg . Electron microscopy showed less carbide paring and smaller carbide particles with fastrate heating. Martensite disintegration, with carbide particle dispersion and undisturbed areas, was observed at a 750 deg /sec heating rate and tempering at 350 deg C. The second transformation (disintegration of austenite) takes place at all observed heating rates, but served at a 750 deg /sec heaiing rate and tempering at 350 deg C. The second transformation (disintegration of austenite) takes place at all observed heating raies, but the positive dilatometric effect (expansion) is not observed at rates exceeding 100 deg /sec. However, a complete phase transformation can be achieved at any heating rate with suitable tempering temperatures. (R.V.J.)
Research Organization:
Central Scientific Research Inst. of Tech. and Machine Building
NSA Number:
NSA-14-000643
OSTI ID:
4221228
Journal Information:
Fiz. Metal. i Metalloved, Journal Name: Fiz. Metal. i Metalloved Vol. Vol: 7
Country of Publication:
Country unknown/Code not available
Language:
Russian

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Related Subjects

CARBIDES
CARBON STEELS
DECOMPOSITION
DIFFRACTION
DILATATION
DISTRIBUTION
ELECTRON MICROSCOPY
EXPANSION
HEATING
HIGH TEMPERATURE
MARTENSITE
MEASURED VALUES
METALS, CERAMICS, AND MATERIALS
MICROSCOPY
OPTICAL SYSTEMS
PARTICLES
PHASE DIAGRAMS
TEMPERING
VELOCITY
WATER
X RADIATION