SYMPOSIA PAPER Published: 01 January 1979
STP37421S

Stress Relaxation of Residual Metalworking Stresses

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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.

Author Information

Geyling, FT
Bell Laboratories, Murray Hill, N. J.
Key, PL
Bell Laboratories, Murray Hill, N. J.
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Developed by Committee: E28
Pages: 143–154
DOI: 10.1520/STP37421S
ISBN-EB: 978-0-8031-4745-4
ISBN-13: 978-0-8031-0581-2