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.
Because it was also cryogenic temperature one explanation is hexagonal martensite. You can do higher magnification mapping but rather just after polishing without etching. You can take a look at our previous paper here Article The effect of reduced temperatures on microstructure develop...
There are maps which show hexagonal martensite but it is usually slightly thicker than yours.
Looks like scratch marks from the emery sheets while preparing the sample.
Grzegorz Cios, thank you very much for your reply. As far as I know, the CrMnFeCoNi HEA (often referred to as Cantor-Alloy) is a TWIP steel and so the response of the material to plastic deformation, especially at cryogenic temp., is twinning.
Kumar Ujjwal, also thank you. There definitly are some scratch marks (you can see some in the right EBSD measurement for example). Though, the effects I have shown only occur in the area, affected by the deep rolling process and nowehere else. But...sometimes a simple answer is the best...so I will check.
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