retained austenite VS ferrite how do you recognize them under microscope 2

[AshkanR]

Hello All

I have sample with white phase on it how do I know whether it is retained austenite or ferrite when I put it under microscope?

thank you

 

[metengr]

Microhardness testing.

 

[arunmrao]

Specify the alloy, thermal conditions, etchant used to have an idea. Yet as metengr states, microhardness testing can be one of the simplest test.

"Even,if you are a minority of one, truth is the truth."

Mahatma Gandhi.