A microscopic examination of the precipitation phenomena occurring during the isothermal pearlitic transformation in high carbon-copper nickel steels

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)00118-F· OSTI ID:178008

Fourlaris, G; Baker, A J ^[1]; Papadimitriou, G D ^[2]

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1. Univ. of Leeds (United Kingdom). School of Materials
2. National Technical Univ. of Athens (Greece). Lab. of Physical Metallurgy

During isothermal pearlitic transformation of high carbon austenite, the formation of proeutectoid phases precedes that of pearlite. Widmanstatten cementite is the major proeutectoid phase that forms at all temperatures. Within this constituent the precipitation of {epsilon}-Cu always occurs, together with the formation of stabilized coarse austenite entrapments. Within pearlitic cementite interphase precipitation of {epsilon}-Cu occurs at all transformation temperatures, while within pearlitic ferrite a banded interphase precipitation of {epsilon}-Cu occurs only at temperatures close to the eutectoid point. As the temperature of the isothermal pearlitic transformation is lowered the formation of non-partitioned pearlitic ferrite is possible and {epsilon}-Cu precipitation only forms within this ferrite as a result of aging occurring during prolonged isothermal holding. It was concluded that interphase precipitation of {epsilon}-Cu always occurred on the migrating austenite/cementite interphase boundaries, but {epsilon}-Cu interphase precipitation occurred on the migrating austenite/ferrite boundaries only at temperatures close to the eutectoid point.

• OSTI ID: 178008
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 12 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
AUSTENITE
BCC LATTICES
CARBON ADDITIONS
CEMENTITE
COPPER ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
FCC LATTICES
IRON ALLOYS
MICROSTRUCTURE
NICKEL ALLOYS
ORTHORHOMBIC LATTICES
PEARLITE
PRECIPITATION