We do internal (lance)peening on 4.5 m"m holes
We use a s110 cast shots and intensty of 5-7 N. We did some experiments to substitute to CCW14 and we had some problem with the surface roughness. With S110 on a 30HRC strip we got 10-12 Ra and on the same strip with the same blasting parameters we got 30-40 Ra. On an Almen strip both shotes gave the same roughnes of 2-4 Ra.
The part is 30HRC how dos it affects the residual stress on the part if any? and why dose it occur
I know that roughness has a negative affect ot the fatigue resistance.
