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EFFECT OF SHOT PEENING ON FATIGUE OF A Ni-BASED SUPERALLOY

journal contribution
posted on 1987-12-01, 00:00 authored by D Kumar, Subrat DasSubrat Das, V M Radhakrishnan
Experimental investigations were carried out to study the effects of shot peening on the fatigue life of a Ni-based superalloy, designated EQ 868, which is used in aircraft engines for the manufacture of cooling shells, chambers, nozzles, etc. Shot peening is imparted to the material in the fabrication process to improve the fatigue life of the components. It was observed that increasing the peening time increased the compressive residual stress on the surface of the material, but this reached a saturation point after a certain level. Shot peening also introduced surface roughness. The endurance limit increased with shot peening time. However, because of the surface roughness effects, shot peening beyond an optimum time was not advantageous. This optimum peening time was found to be around 20 minutes in the case of the superalloy investigated.

History

Journal

Scandinavian Journal of Metallurgy

Volume

16

Issue

6

Pagination

253 - 256

Publisher

Munksgaard International Publishers

ISSN

0371-0459

Publication classification

CN.1 Other journal article

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