Iron-Carbon Equilibrium Diagram

[fid]

Bit of a random one, but...my materials lecturer has told us that the eutectic point is at 0.83% and around 700 degrees celcius.

[b]I[/b] think that's the eutectoid point, with the eutectic point at around 2.1% and 1,100 degrees celcius. :read:

Do any of you clever beans know for certain which is correct?

[nervous]

yes.

[chim_knee]

Yeah but nervous - you probably do!

What with your job being into "science" and making children do things they don't want to do and not tell anyone about...

[nervous]

true dat. fo' shizzle.

[chim_knee]

nervous said:

true dat. fo' shizzle.

So erm... ehem.. I've just looked up on t'internet and it appears that "filament" is correct for a lightbulb - not element... care to explain yourself "science-boy"...

[nervous]

yeah, i made it up. .

[chim_knee]

nervous said:

yeah, i made it up. .

'sgood enough for me! Element it is!

[fid]

nervous said:

yes.

Somebody told me you weren't a very clever bean, and not to trust you.

but what's the answer...?

[nervous]

who told you that?

[fid]

Nobody, I made it up!

[nervous]

they/ you were right. im a wit, me.

night gang

[fid]

You're a bunch of bandits!

[nervous]

areeba areeba

[x1m]

You arse! Now i'll have to find my notes. My immediate thought was 693, but i think thats copper aluminum :/

Edit:



723 is the eutectic temperature. 0.8% is the eutectic point. The 2.1% point you are thinking of is technically part of a peritectic stage. However, without finding said notes, I can't say for certain what the definition is, as I did this well over a year ago.

www.key-to-steel.com/Articles/Art153.htm

Thank god I never had to study concrete

>> Edited by x1m on Wednesday 8th June 23:02

[walls]

i guess this is what you need www.key-to-steel.com/Articles/Art153.htm

[bga]

bga said:

i can vaguely remember something like following for Fe-C phase diagram Eutectoid Point 727 degC & .77%C Eutectic Point 1147 degC & 4.3%C Dig out a copy of Callister to be sure

edit: argh beaten to it before reading full post

[fid]

bga said:

bga said: i can vaguely remember something like following for Fe-C phase diagram Eutectoid Point 727 degC & .77%C Eutectic Point 1147 degC & 4.3%C Dig out a copy of Callister to be sure edit: argh beaten to it before reading full post

T'was Callister that confused me! Seeing as hypo-eutectoid is < 0.8%C and hyper-eutectoid is > 0.8%C, it'd make sense for the eutectoid point to be inbetween them and the eutectic point to be further along the percentage range. The lecturer said the eutectic point was in the middle of the eutectoid range though...

Cheers chaps

>> Edited by fid on Wednesday 8th June 23:21

[x1m]

Completly forgot about callister! Standard reading eh

Found solid mech notes..cant find microstructure notes for official verdict yet.

[turbobloke]

You got it. In the diagram E marks the eutectic composition, while S is a eutectoid i.e has the properties of a eutectic but occurs in a totally solid region.

Hypoeutectoid - composition poorer in carbon, hyper = richer

[cotty]

fid said:

bga said: bga said: i can vaguely remember something like following for Fe-C phase diagram Eutectoid Point 727 degC & .77%C Eutectic Point 1147 degC & 4.3%C Dig out a copy of Callister to be sure edit: argh beaten to it before reading full post T'was Callister that confused me! Seeing as hypo-eutectoid is < 0.8%C and hyper-eutectoid is > 0.8%C, it'd make sense for the eutectoid point to be inbetween them and the eutectic point to be further along the percentage range. The lecturer said the eutectic point was in the middle of the eutectoid range though... Cheers chaps >> Edited by fid on Wednesday 8th June 23:21

You lost me at hello