It is well known that the field of residual stresses in the surface layer of a component greatly influences its fatigue behavior. The distribution of stresses is created by processes like welding, machining, thermal treatments.

The object of the present study was to correlate the effect of operations like turning, broaching and shot peening with the residual stresses of a highly–stressed flight safety component like a turbine disc made in Inconel 718 superalloy.

The residual stress distributions were measured with newly installed x–ray diffraction equipment, in which real engine components can be tested.

Different machining parameters and tools were used, and other factors like deformations during processing and thermal conditions of the disc in service were taken into account.

The final aim of the activity was to perform a manufacturing cycle which can minimize production costs and, at the same time, guarantee the highest possible quality level required in such a critical component.

This content is only available via PDF.