Method for treating metal

Details Method for treating metal Method for treating metal

1978-10-04

1980-07-29

Gilden, Leon

Metal treatment

Compositions

Heat treating

29421R, 72 56, C23C 3800

Patent

active

042149231

ABSTRACT:
An element (12) having a chamber (28) such as, for example, a boom (12) of an excavator (10) or a draft tube of a scraper is subject to torsional loading during use of the element (12). Torsional loading creates tensile stresses (T) on the welds (22) of the excavator boom (12), which can lead to weld failure. A method for controllably treating the metal of the element (12) includes heating the element (12) and pressurizing the chamber (28), maintaining the element (12) and chamber (28) at a preselected temperature and pressure (P.sub.1), respectively, and cooling the element (12) and depressurizing the chamber (28). The method produces residual compressive stresses (C.sub.2) in the metal, such as in the root area (23) of the welds (22) of the excavator boom (12), for increasing fatigue life under torsional loading of the boom (12).

REFERENCES:
patent: 3447230 (1969-06-01), Bargainnier
patent: 3623204 (1971-11-01), Wagle
patent: 3882654 (1975-05-01), Yancey
patent: 3955266 (1976-05-01), Honami et al.

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