Improvement of Microstructures and Mechanical Properties of Resistance Spot Welded DP600 Steel by Double Pulse Technology

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  • Zhong Ning
    Institute of Marine Materials Science and Engineering, Shanghai Maritime University School of Materials Science and Engineering, Shanghai Jiao Tong University
  • Liao Xinshen
    School of Materials Science and Engineering, Shanghai Jiao Tong University
  • Wang Min
    Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University
  • Wu Yixiong
    Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University
  • Rong Yonghua
    School of Materials Science and Engineering, Shanghai Jiao Tong University

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Description

The effects of the second pulse in resistance spot welding (RSW) on the mechanical properties of dual phase (DP600) steel were investigated. The experimental results show that the addition of the second pulse can give rise to the formation of acicular ferrite, retained austenite and chromium carbides, which can markedly improve the cross-tensile strength (CTS) comparing to that treated by the single pulse technology. Meanwhile, the formation mechanism of acicular ferrite, bearing the cubic to cubic orientation relationship with respect to the surrounding martensite lath, was revealed by the analysis of the thermal history of DP600 steel under different RSW processes. The effect of microstructure on the fracture behavior was also discussed.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 52 (12), 2143-2150, 2011

    The Japan Institute of Metals and Materials

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