Microstructural changes of cementite and ferrite in heavily drawn pearlitic wires

Y. Daitoh, N. Sano, T. Hamada, H. Hidaka, S. Takaki

    Research output: Contribution to journalConference articlepeer-review

    4 Citations (Scopus)

    Abstract

    The influence of heavy drawing deformation (true strain ∼4.0) on the microstructures of pearlitic steel wires containing 0.9mass% of carbon has been investigated. The microstructures have been examined by transmission electron microscopy, atom probe field microscopy, X-ray diffraction and differential scanning calorimetry. In the lightly deformed (true strain ∼1.5) wires, typical dislocation structures are observed in the ferrite region and the cementite has poly-crystallite structures. Concentration of carbon in the ferrite region is less than 0.05 mass% and the cementite contains stoichiometric amount of carbon. Drastic structural changes occur, such as decomposition of cementite, decrease in dislocation densities and increase in local strains in the ferrite region, when the true strain exceeds 2.5∼3. The degree of the cementite decomposition is strongly affected by the strain and about a half of the cementite is considered to be decomposed when true strain reaches 4. The amount of carbon emitted from those decomposed cementite corresponds to 0.4∼0.5 mass% C, however, the concentration of carbon in ferrite region is only about 0.1 mass%. Therefore, it is likely that the excess carbon atoms originating from the decomposed cementite might be segregated at the interfaces between non-decomposed cementite and ferrite.

    Original languageEnglish
    Pages (from-to)1231-1236
    Number of pages6
    JournalMaterials Science Forum
    Volume426-432
    Issue number2
    DOIs
    Publication statusPublished - Jan 1 2003
    EventThermec 2003 Processing and Manufacturing of Advanced Materials - Madrid, Spain
    Duration: Jul 7 2003Jul 11 2003

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

    Fingerprint

    Dive into the research topics of 'Microstructural changes of cementite and ferrite in heavily drawn pearlitic wires'. Together they form a unique fingerprint.

    Cite this