Difference Between Materials

Try putting 'austenite', 'martensite' and 'ferrite' as entries into a search engine.

there is a course run by ASM International called "Metallurgy for the non-metallurgist" I strongly suggest you take.

Why don't you study these simple terms of metallurgy in any elementary metallurgy book.

these are different state in steel which is defined in phase diagram

of steel also if you see the micro structure of steel these are visible.

commonly Astenetic stainless steel is non magnetic while Martestic SS

is magnetic.

Kishore K Gupta PYN

When I look at a phase diagram, I see solid, liquid and vapor, charted against temperature and pressure.

Hello Kishore K Gupta. Please, what does PYN stand for?

Doorman, steel is ansitropic and changes crystalline structure from BCC to FCC based on temperature and thermal history. It is this crystalline structure change that allows steel to be heat treated for hardness or ductility. other materials are hardened using a different mechanism. steel and other alloys are complex compounds in which different element's solubility changes based on the temperature. Some alloys can have upwards of 15 different elements as major and minor (intentional, vs trace/tramp elements) components and all of those elements have different effects on the properties of the resulting alloy. I've never seen a metallurgical phase diagram that takes pressure into account but the thought occurs to me that the pressure just might have an effect. now you've gone and got me curious on that point....

Hello Rorschach. You said "Some alloys can have upwards of 15 different elements as major and minor (intentional, vs trace/tramp elements) components and all of those elements have different effects on the properties of the resulting alloy." I was thinking of this only as I considered our original question "What is the difference between Austhentic, Martenstic & Ferrite..........." as a chemistry question. I was simply be reading this into the question. As I consider further, I misread the question is more like it.

Plain carbon steel at eutectoid temp of 1000K is gamma phase iron (austentite). Fast cooling results in martinsitic transformation. This is most likely the question at hand, and I responded improperly.

You know, the metallurgical phase diagrams I find all say atmospheric pressure, but do not really indicate how pressure may come into play. I wonder if Milo is around today?

yes the phase diagram shows condition of iron and carbide at different temperatures.

At different temperatures and Presence of alloying elements , austenite,martensite

and ferrites are formed ,as far as pressure is concerned I have seen use of vacuum

during the process ,I am not aware of use of high pressure.

The name PYN represents my company (PYN Precision Components)

regards kishore k gupta

I know vacuum has the effect of causing some elements to boil out of solution faster than at atmospheric pressure (nitrogen being one of them.) so it might be possible that pressure could have an effect on the loss of certain lighter elements during the melt process.