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    Creep Crack Growth in the Base Metal and a Weld Joint of X20CrMoV 12 1 Steel Under Two-Step Loading

    Published: 01 January 2003

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    The creep crack growth behavior in the base metal and a weld joint of X20CrMo 12 1 steel has been investigated under two-step loading at 545°C using 1/2T CT specimens. The crack growth process has been simulated using finite element analyses to examine the transient crack tip field. The results are compared with those under constant loading. In step-up loading, crack growth accelerated greatly after load change due to the effect of prior creep damage and reduced stress relaxation. In step-down loading, further creep-damage at the crack tip nearly ceased after load change due to a sharp drop in crack tip stress, leading to crack arrest for a substantial period of time. Crack growth eventually resumed as the crack tip stress increased by redistribution of the creep strain. Crack growth rates are found to correlate well with C*(t) for both base metal and weld specimens.


    X20CrMoV 12 1 steel, creep crack growth, heat affected zone, C*(t)

    Author Information:

    Kim, KS
    Professor, Pohang University of Science and Technology, Pohang,

    Lee, NW
    Engineer, Hyundai Motor Company, Kyunggi-do,

    Chung, YK
    Research engineer, Research and Development Center, Korea Heavy Industries & Construction Co., Ltd., Changwon,

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP11086S