Grit blast damage -aluminum oxide

[Dooma]

When something is accidentally blasted what repairs may be used to repair the surface?
Surface finish - I know that the part can be polished or shot peened to restore surface finish.
Embedded particles - Waterjet can remove some of the embedded particles but will remove some base metal as well.
Mechanical properties - I only know of shotpeen to resore the compressive stress at the surface.

I'm getting a lot of different advice on what's important and what isn't. Many of the more experienced engineers I work with say that shotpeen is the basic repair for accidental grit blast. But many other people are much more concerned about embedded particles. Some have suggested that we blast with a smaller grit which is supposed to remove the larger grit particles and improve the surface finish but that will also remove base metal. I feel that shotpeen is a good option because little base metal will be removed and that area is shotpeened per the drawing.
Base metal inconel, 13% AlOx on surface (150 grit), est 0.004 " deep, sf ~80 microinch.
Does anyone have any advice or tips? Any helpful websites?
Thank you!

 

[ornerynorsk]

If it's really that critical to the function of the part, you have overlooked one option > scrap the part. Another idea - chemical etch.

It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

 

[TVP]

There is a huge amount of information on shot peening, blas cleaning, etc. on this website:

http://www.shotpeener.com/

If this is a critical application using Inconel, you may want to investigate the chemical etching method, sometimes referred to as chemical milling. It will remove embedded particles. You can shot peen after this for residual stress improvement.

 

[EdStainless]

Maybe you should figure out if there is embedded material.
There may not be, unless the blasting was very aggressive.
If it was that aggressive you may need a new part.

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Plymouth Tube

 

[Dooma]

Thank you all so much!