First picture shows microstructure after polishing and etching (Nital 3%) using an optical microscope, second one is an EBSD measurement obtained by SEM.

The material has been plastically deformed by a deep rolling process at room and cryogenic temp.

Any suggestion, what these small parallel lines could be?

I wouldn't say these are twins, because the plastic deformation might have been to small...

I appreciate any indication.

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