[MW:9812] AISI 410 SS Martensitic Stainless Steel. How to determine the grain size for AISI 410 SS.

As per title, the AISI 410 SS was etched by 10% oxalic acid and
Vilella's Reagent.
The grain size for AISI 410 SS was unable to be determined since the
microstructure was martensite.

1. Any alternative to reveal the grain size?
2. Any standard to refer? (normally refer to ASTM E112)

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