Causes of patterning after machining (A182 F316 Forging material)

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Sawryo

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Mar 15, 2023, 4:54:07 AM3/15/23
to Materials & Welding
Dear Expert,

As you can see in the photo below, after finishing machining (roughness - Max. 63 AARH), a grain-like pattern occurs on the surface.

IMG_3459.jpg

What could be the cause of this phenomenon?

I would appreciate your expert advice.
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