Torsion bar and method of forming the same

Details Torsion bar and method of forming the same Torsion bar and method of forming the same

1978-09-21

1979-12-25

Stallard, W.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

148 12B, 148 36, 148 39, 148152, 148154, C21D 928, C21D 930

Patent

active

041804210

ABSTRACT:
A method of forming a torsion bar wherein steel, preferably an alloy steel of medium carbon content, is formed in the desired size and shape and is through hardened for providing a desired core hardness. The case of the bar is then hardened for transforming austenite in the case into martensite causing the case to expand thereby inducing high compressive stresses near the surface with the compressive stress decreasing radially inward of the surface. The core of the bar is retained below lower transformation temperature for resisting expansion of the case thereby inducing hoop and axial compressive stresses and radial tensile stressed in the case.
A torsion bar formed by the method of the present invention is also disclosed.

REFERENCES:
patent: 2599575 (1952-06-01), Morgan
patent: 2843374 (1958-07-01), Boeghold
Osborn, Jr., H. B.; Source Book on Heat Treating, Vol. I, Materials and Processes; Compiled by ASM; 1975; pp. 280-282.
Wuerfel, Richard K., ibid.; pp. 293-295.
Kirk, Clayton L., ibid.; pp. 287-289.

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