Metal treatment – Compositions – Heat treating
Patent
1976-03-22
1977-08-02
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 203, 148 36, 148144, 148152, 267161, C21D 148, F16F 134
Patent
active
040393542
ABSTRACT:
A washer-type spring, commonly called a Belleville spring, which has an improved fatigue life and residual compressive stresses resulting from the creation of a carbon gradient through the spring thickness. This improved spring is formed from a plain carbon or low alloy steel which, after blanking, cutting and forming, is heated to a temperature above the austenitizing temperature in a carbon-rich atmosphere, held at this temperature until suitably carburized, and then quenched.
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Borg-Warner Corporation
Geppert James A.
Satterfield Walter R.
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