Precipitation of proeutectoid cementite, pearlite, and epsilon-Cu in Fe-C-Cu alloys

Technical Report · Sun Dec 01 04:00:00 EST 1985

OSTI ID:5981692

Wasynczuk, J A

Time-temperature-transformation diagrams showed that the kinetics of proeutectoid cementite precipitation were not significantly affected by copper. The morphology of the proeutectoid cementite was also substantially the same in both alloys. However, transmission electron microscopy revealed the presence of small epsilon-Cu precipitates within the proeutectoid cementite of the copper-containing steel. It was concluded that this precipitation of epsilon-Cu took place on the moving cementite:austenite interphase boundaries, and that the transport of copper to the precipitates was accomplished by boundary diffusion. The small influence of copper on the kinetics of proeutectoid cementite precipitation is explained in terms of diffusional growth theories, and the structure of the cementite:austenite interphase boundaries. Unlike the proeutectoid cementite reaction, copper did significantly retard the start of pearlite precipitation. 123 refs., 35 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5981692
• Report Number(s): LBL-20571; ON: DE86009396
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BIBLIOGRAPHIES
CARBIDES
CARBON COMPOUNDS
CARBON STEELS
CEMENTITE
COPPER ALLOYS
DOCUMENT TYPES
ELECTRON MICROSCOPY
HARDENING
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
KINETICS
MICROSCOPY
PEARLITE
PHASE STUDIES
PRECIPITATION HARDENING
STEELS
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY