Rolling element bearing member

Details Rolling element bearing member Rolling element bearing member

1985-02-25

1987-04-21

Footland, Lenard A.

Bearings

Bearing-surface treatment

384492, 384912, F16C 3362

Patent

active

046592415

ABSTRACT:
A rolling element bearing member designed for use in a preselected bearing operation, such as a gas turbine engine, which develops a predetermined operating hoop tensile stress in the member includes a hardened layer contiguous with a ductile core having a hardness less than 50 Rockwell C. For example, the hardened layer is a carburized layer of high hardness in the range of 58-66 Rockwell C. The hardened layer has improved resistance to crack initiation and propagation as a result of providing the layer with compressive residual stress in an amount greater than the predetermined operating hoop tensile stress, for example in the range of about 10-60 ksi to a depth up to about 0.06 inch. Such a member is made by providing a member of a metal alloy having the capability of developing such a hardened layer, and then processing the member to develop the layer in the amount of compression.

REFERENCES:
patent: 4131491 (1978-12-01), Joseph
patent: 4191599 (1980-03-01), Stickels
patent: 4303137 (1981-12-01), Fischer

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