Method of prestressing the working surfaces of pressure...

Details Method of prestressing the working surfaces of pressure... Method of prestressing the working surfaces of pressure...

C - Chemistry, Metallurgy

21

D

29/49

C21D 7/06 (2006.01) B23P 9/00 (2006.01) C21D 7/12 (2006.01)

Patent

CA 1160823

Docket No. 2120-SF ABSTRACT OF THE INVENTION A method of prestressing the working surface of pressure chambers or cylinders comprising the steps of first shot peening their working surfaces and then autofrettaging them. The magnitude of compressive residual stresses estab- lished on their working surfaces is made substantially equal to the tensile stress applied to these surfaces during the pressure phase of the autofrettage process.

388146

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