Work Hardening of Hypereutectoid and Eutectoid Steels during Drawing

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著者

    • NISHIDA Seiki
    • Kimitsu R & D Laboratories, Technical Development Bureau, Nippon Steel Corporation
    • YOSHIE Atsuhiko
    • Kimitsu R & D Laboratories, Technical Development Bureau, Nippon Steel Corporation
    • IMAGUMBAI Masana
    • Kimitsu R & D Laboratories, Technical Development Bureau, Nippon Steel Corporation, Kimitsu R & D Laboratories, Technical Development Bureau, Nippon Steel Corporation

抄録

Work hardening of pearlite and bainite during drawing of high-carbon steel wires was studied by using stress-strain curves of drawn wires and making a detailed observation of their microstructure. The study revealed the following relationship between flow stress and strain in high-carbon steel wires. Flow stress σ is represented by a weighted average of the strengths of ferrite and cementite. The amount of work hardening Δσ is represented by an equation corresponding to exp(<I>B</I>ε) where <I>B</I> is a constant that depends on the initial microstructure of the steel wire and ε is the strain. When the initial microstructure of steel wire is made up entirely of a pearlite lamellar structure, the value of <I>B</I> is 0.5. When the initial microstructure contains some bainite, the value of <I>B</I> is lower than 0.5. Finally the flow stress was formulated as a function of carbon content, supercooling degree, and ε. The calculated maximum flow stress showed good correlation with the measured flow stress of 0.8 % C and 0.2%Cr-0.92%C steel wires during drawing.

収録刊行物

  • ISIJ international

    ISIJ international 38(2), 177-186, 1998-02-15

    The Iron and Steel Institute of Japan

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