Article and method having subsurface property gradient determina

Measuring and testing – Hardness

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148128, G01N 300

Patent

active

046533141

ABSTRACT:
An annular bead or other protuberance is provided on the outside of a bearing or other part on a non-critical surface so that the protuberance can be case hardened in the same manner as critical surfaces of the part and provide a degree of hardness at each surface that exceeds the hardness at predetermined depths below that surface. The shape of the protuberance is chosen to permit quantitative testing for hardness depth and hardness gradient. The bead or protuberance is then removed so as to expose at a scar the resulting subsurface structure or property gradient for inspection. Hardness inspection can be utilized to provide Rockwell C hardness indications at spaced points along the scar.

REFERENCES:
patent: 4235018 (1980-11-01), Saberg
patent: 4510798 (1985-03-01), Prussin

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