STP676: Stress Relaxation of Residual Metalworking Stresses

    Geyling, FT
    Members of technical staff, Bell Laboratories, Murray Hill, N. J.

    Key, PL
    Members of technical staff, Bell Laboratories, Murray Hill, N. J.

    Pages: 12    Published: Jan 1979


    Abstract

    The stress relaxation behavior of 1010 and 1020 steels was evaluated for an application involving the relaxation of mandrel-drawn, roller-straightened tubes. The distortions observed in full-sized tubes after annealing at 260 and 482°C are reported, as well as measurements of the actual residual stress levels in such tubes. Bending stress relaxation experiments were performed on strip specimens removed from full-sized tubes at temperatures of 23, 149, and 260°C for up to 2000 h. The relaxation of metalworking stresses was modeled using small beams plastically deformed in four-point bending. The curvature relaxation of the beams after annealing at 260 and 482°C was measured. The results of this work indicate that less than 10 percent of the initial stresses due to metal forming should relax in tubes in service at room temperature.

    Keywords:

    low-carbon steel, stress relaxation (metals), creep (metals), mechanical properties (metals), steel tubing, residual stresses


    Paper ID: STP37421S

    Committee/Subcommittee: E28.11

    DOI: 10.1520/STP37421S


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