Proper Etchant for Hot and Cold work steel

[alavi419]

I have two samples that have been produced by extrusion(from powder). K190(X220CrVMO 13-4) and a steel that is H13.
I am looking for Proper etchant solution to see the carbides and also i want to reveal the matrix if it is Austenite or martensite?
Thanks for any kind of help.

 

[TVP]

This is an excellent reference for metallographic preparation and evaluation of tool steels:

http://www.struers.com/resources/elements/12/74398/Application Notes Tool Steel English.pdf

These are other good references:

http://www.latrobesteel.com/assets/documents/Sheets/Tech_Topics/Bulletin_101.pdf

http://www.latrobesteel.com/assets/documents/Sheets/Tech_Topics/Bulletin_117.pdf

http://www.latrobesteel.com/assets/documents/Sheets/Tech_Topics/Bulletin_118.pdf