Interesting collection of micrographs

[D Bloch]

I just found this collection of micrographs of steels (among other materials), some of which are common knife steels and thought some here might find it interesting aswell:

https://www.schmitz-metallographie.de/en/gefugedatenbank/fe-base/

For example for 1.2067 (similar to 52100) a few different situations are shown, for example under-austenitization, overheating etc
I'm not sure whether or not posting links that aren't sales links here is permitted but I guess I'll soon find out