When steel =Austenite structure

[EngLuv]

How can we tell if steel has an austenite stucture?

 

[CoryPad]

Microscopic examination of an etched sample coupled with the chemical composition.

Regards,

Cory

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[pwtomlin]

See if it attracts a magnet.

 

[macmet]

Why do you need to know?

 

[mshimko]

Do you know the alloy? If yes, the microstructure is probably also known.

Also, the previous question [why do you need to know] seems valid, if nothing else to provide perspective.

 

[coatingengineer]

Hi.

If this helps, the structure of austenite is characterized by a "face-centered cubic lattice."

Like the others say, just see if the metal is magnetic. Austenite, by definition, is a non-magnetic solid solution of carbon or ferric carbide in gamma iron.

Mostly unstable below its critical temperature, austenite can be obtained from high carbon steels by rapid quenching from high temperatures. Or it can be obtained at room temperature, lower carbon steel, by adding nickel or manganese.

Known for its enhanced resistance to corrosion, austenite can exist in low or high carbon/nickel-chromium, or when manganese reaches 14% with either nickel-chromium or small percentages of nickel or molybdenum.

If you believe surface treatments may also help, just see:
<a href="

http://www.industrialcoatingsworld.com/Corrosion-Resistant-Coatings/index.html">Corrosion

Resistant Coatings</a>

Good luck!








William Gunnar

http://www.IndustrialCoatingsWorld.com

 

[hk1956]

1. Check your sample with XRD analysis.
2. There is also etchants for showing retained austenite in steels.

Henrik