Fatigue life of a component such as a bar

Details Fatigue life of a component such as a bar Fatigue life of a component such as a bar

C - Chemistry, Metallurgy

21

D

13/1

C21D 8/06 (2006.01) C21D 1/00 (2006.01)

Patent

CA 1309807

ABSTRACT OF THE DISCLOSURE 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.

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