Stock material or miscellaneous articles – All metal or with adjacent metals – Having composition – density – or hardness gradient
Patent
1989-04-17
1990-07-03
Kastler, S.
Stock material or miscellaneous articles
All metal or with adjacent metals
Having composition, density, or hardness gradient
148150, 148902, C21D 900
Patent
active
049390422
ABSTRACT:
The outer surface of an elongated metal component such as a bar is rapidly heated by an induction coil and is thereafter cooled by a quenching spray while being subjected to tensile forces so high that the center portion of the bar approaches yield causing the bar to elongate slightly. The tension on the bar is released thereby obtaining high residual compressive surface stresses in the cooled outer layers of the bar which define an annulus and which shortens the bar slightly until compressive stresses in the surface layers equal the tensile stresses acting on the central sections of the bar thereby greatly improving the fatigue life of the bar.
REFERENCES:
patent: 3125469 (1964-03-01), Schechter
patent: 3202555 (1965-08-01), Armstrong
patent: 3477884 (1969-11-01), Schlicht
patent: 3562030 (1971-02-01), Seulen et al.
patent: 4141125 (1979-02-01), Blunier
patent: 4321098 (1982-03-01), Hayden
patent: 4404047 (1983-09-01), Wilks
Publication R&D Center Technical Report No. 13100 entitled Improvement in the Fatigue Behavior of Tank Track Pins by J. F. Wallace and A. M. Said.
Metal Handbook, Ninth Edition, vol. 4, Heat Treating, (American Society for Metals).
Dieter, Mechanical Metallurgy, pp. 580-581, 12-76.
FMC Corporation
Kamp R. C.
Kastler S.
Megley R. B.
Moore A. J.
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