Do you have material which have austenite micro-structure at room temperature?

No, there is not austenite around at room temperature. This gamma phase of iron alloys only appears at elevated temperatures (ball park - a bit over 700 °C). Once the alloy cools below the critical temperature, carbon diffuses and the steel takes on different characteristics -- and is given different names It is possible to quench steel to get its metallic crystal structure to "set quickly" and bring out certain characteristics (notably hardness), but (again) we give this material a different name.To cite one characteristic of austenite, it is nonmagnetic.

It is above its Curie temperature and will not "hold" a magnetic field after the source is removed. A link is provided below It might be possible to have steel alloys with a micro-structure similar to austenite at room temperature, but the characteristics are different and the alloy is called by a different name. But the mobility of carbon atoms within the structure is a definitive characteristic of austenite.

And this only happens at elevated temperatures.

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