Material Science, The Iron Carbon Phase Diagram, Part 1

The iron-carbon diagram
Learning objectives:
- You name and describe the different phases of pure iron during the cooling process.
- You distinguish between metastable and stable iron-carbon diagram and describe the reasons for its formation.
- You name and describe the different phases and ranges of the iron-carbon diagram.
00:00 - Introduction
01:28 - Pure Iron
04:31 - Crystal types of iron
07:17 - The copltete iron-carbon phase diagram
07:55 - Diagram - stabile system
09:48 - Metastabile system
14:15 - Iron-iron-carbide phase diagram
14:55 - Two diagrams in one
16:21 - Outro

[@shaqashaqahimself1866]

Gone are the days one had to be in a classroom to receive well explained knowledge. Thank you for sharing Prof Bonnet.

[@vatsk]

My professor had to temporarily use your videos because of covid-19, this only proves the quality of you education

[@WeltderWerkstoffe]

At which university do you study?

[@vatsk]

@@WeltderWerkstoffe I study at the Katholieke Universiteit Leuven, campus GroepT. I hope you do not mind my professor using your expertise.

[@WeltderWerkstoffe]

Not at all.

[@rahul6764]

Nice explanation Professor. Keep making material science lectures in English.

[@WeltderWerkstoffe]

I will! There will be new videos in English from time to time.

[@md.fazlerabbi1247]

nickel carbide diagram and iron carbide diagram both are same? please let me know

[@sameerpandey4805]

Holy cow this man has cleared my doubts in just opening 4 minutes.. god our teachers are so bad any poorly information understood that they make us confuse whole life ... Thanks to you sir. Ur life saver

[@slowly5092]

Fantastic video, thank you Professor! Thumbs up for "significantly" :) I really enjoyed this lecture. Looking forward to see next one.

[@lucamainini27]

Thanks, professor for this exceptional lecture: it was extremely clear!

[@staszeksowikowski9039]

This is a clear explaination that puts the diagram in context, which for me personally makes it far more valuable tham learning it by heart 'just because'. This video also contains a rare moment of a German person displaying emotion around 15:24 :)

[@WeltderWerkstoffe]

Thanks so much for your kind feedback

[@alecchristiancervantes5978]

'significantly' helpful. thanks professor :)))

[@hiftylonghead892]

Awesome stuff professor, having you do lectures in english helps a lot. Thanks

[@kirthivasanaruljothi1391]

clearly distinguished the various regions of the Iron-Carbon phase diagram

[@manaskumar7452]

very precise information..THANK YOU PROF.......Love from INDIA

[@Adam-yx4vd]

I wish i had lecturer like you on my university which can explain something step by step. Thanks

[@NormaNsNs]

significantly this was the best explanation i've ever seen

[@WeltderWerkstoffe]

Thanks so much!

[@rad9693]

Brilliant video, thank you Professor

[@Big_Bang_Theory]

You are life saviour ,thank you from sri lanka

[@WeltderWerkstoffe]

Thanks for the feedback. Please spread the word among your friends in Sri Lanka!

[@Big_Bang_Theory]

@@WeltderWerkstoffe ofcourse Sir!

[@Skirmitch]

Got to LOVE these ages, where a hobist like me can access University class lessons over the internet. thanks a lot Proff

[@WeltderWerkstoffe]

You are welcome 😊

[@ahmedmorsy1691]

Thanks professor, great explanation

[@RabiulBhuiyanMadhumati--]

Significantly Prof...! Thanks a lot

[@tauhidurrahman312]

Professor Bonnet, thanks for the efforts of making us understand Werkstoffkunde in English and please request your fellow colleagues also to make videos in English for us Southasian student who despite having english as second language, decided to move to Germany to study engineering in German language and leaving english speaking countries like Canada US out of option because of the high tution fees. Nur ein Jahr dsh oder studienkolleg reicht nicht aus, um fließend deutsch zu sprechen und zu verstehen. und wenn der Professor seinen Vortrag in seiner Muttersprache hält, ist es ziemlich schwer, alles zu verstehen, so dass KZbin unsere einzige Alternative ist. Also mach bitte mehr Videos in Englisch, wenn möglich auch mit deutschen wissenschaftlichen Begriffen. zurzeit: Ich verstehe nur Bahnhof und Mathe : )

[@danielstewart3507]

Wonderful video. Thank you! Australia.

[@mehedipavel1721]

Quite helpful and impressive

[@lukaskoric6589]

Great explanation!

[@iqbalnawab1166]

thanks you so much... your classes helping me so much.. i studying mechanical engineering in chinese which very difficult.....

[@babudevarajrao5037]

Simple and clear.

[@cleopatrachristopher2698]

Amazing video, thank you sooo much.

[@MINIAWARFR]

Thank you very much, helped a lot

[@sophiaxmadison]

Thank you professor!

[@muhammadhamza-qi2mw]

You are incredibly genius! This helps alot. Much thanks from Nigeria

[@WeltderWerkstoffe]

Thanks for your kind feedback

[@deraldfurtado]

Good explanation

[@absolutesine]

Thank you, I was studding in Moscow university of steel)))

[@mdborhanuddin8371]

thank you sir

[@hopefullysoonaweldingengineer]

Thank you proffessor, beautiful work.

[@WeltderWerkstoffe]

You are welcome 😊

[@mangeram2731]

Great thanks Sir

[@WeltderWerkstoffe]

You are welcome!

[@okaidaniel1194]

Good

[@59alphawell]

Great video, Professor, tnx a lot. Could you please clarify a bit one subtle point: up to this moment I was absolutely sure (and this fact is underpinned by my university course book) that alpha iron is the allotrope formed by iron, and ferrite is the solid solution of carbon in alpha iron? Did I miss something crucial?

[@WeltderWerkstoffe]

you are right: alpha iron is the allotrope formed by iron. The solid solution is called alpha solid solution or ferrite.

[@potato5997]

I believe you are getting confused with the terms alpha iron and alpha ferrite. alpha iron is the allotrope whereas alpha ferrite is the solid solution of carbon in alpha iron

[@jarekferenc1149]

Just to make things crystal clear: alpha iron is the PURE element with bcc lattice, while alpha ferrite is the solid solution of atoms of carbon in the lattice of bcc iron (i.e. this is an alloy).

[@yaarge2]

When the iron/carbon is in a certain phase at high temperature, does it retain the physical characteristics of tgat phase when cooled to room temperature? Perhaps cooled rapidly? Otgerwise can't see application of these characteristics using a molten metal...

[@WeltderWerkstoffe]

See the videos on heat treatment of steel!

[@yaarge2]

@@WeltderWerkstoffe Will do thanks

[@VincentDuxD]

Danke SEHR xD

[@yigitcanbaysal824]

Professor,I have a question if it's possible. maximum solubility of carbon in FCC iron is 2% but steel is produced below 1.4% carbon and cast iron is produced between 3-4.5% carbon. Why?

[@WeltderWerkstoffe]

At room temperature most steel are BCC and have no solubility for Carbon, so that they contain cementite. Some properties improve with increasing cementite content while others get worse. Therefore most kinds of steel don't even contain more than 0,8% carbon. Cast iron shows best properties close to the eutectic concentration and slightly under. So in short: not all carbon concentrations make a lot of sense for most applications.

[@md.fazlerabbi1247]

sir nickel carbide diagram and iron carbide diagram both are same? please let me know

[@WeltderWerkstoffe]

No. Every binary system is different.

[@AbhinavKumarSahai]

Why cant we extract Pure Iron??

[@emirkaric3747]

Why solubility of carbon in austenite drops after reaching 1147 degrees ?

[@WeltderWerkstoffe]

Like in any other phase diagram with decreasing solubility in the solid state, the solubility decreases below the eutectical with decreasing temperature.

[@emirkaric3747]

@@WeltderWerkstoffe i meant why solubility decreases in austenite above eutectical with increasing temperature.

[@WeltderWerkstoffe]

@@emirkaric3747 it's not that the solubility decreases, but there starts the two phase region, so you have the carbon solved in austenite AND melt.

[@Alaa_Alhassany.]

Why does not ledeburite appear at room temperature?

[@WeltderWerkstoffe]

Allthough the general ledeburite microstructure will be the same at room temperature the ledeburite transitions into perlite and cementite below the PSK line

[@Alaa_Alhassany.]

@@WeltderWerkstoffe Give the reason(s) for the following statements 1- Grey cast iron used in construction of heavy duty machines 2-White cast iron very hard and brittle The mechanical properties of ductile iron and malleable iron approximately the same Ductile iron with pearlite matrix stronger than ductile iron with ferrite matrix. Compact graphite irons (CGIs) is used for manufacturing exhaust manifolds. Chapter Five Cast Iron.pdf

[@Alaa_Alhassany.]

Can you send the answer to the email and I will be thank you [e-mail]

[@sabro5439]

How are you bro are you gud

[@einfjordbreen2925]

Moot point but it ain’t pronounced “I-Ron”. Makes it impossible to watch. Let me know when the new version with the right UK English ( not the Yank crap) pronunciation is out.

[@Lemurai]

The “yanks” are the ONLY reason why you weren’t born into a German slave encampment today. Have some respect for an educator.