Thank you so much sir You just helped me to clear my semester in second year.You are a next level teacher. Hats off to you Keep helping us in the future with mechanical engineering courses.
The topic of phase diagrams had me scratching my head and didn't understand what was happening at all in my uni lectures. But after watching the lectures in this playlist, i think im defo gonna ace my exam. Thank you so much, professor 👍
Sir, Both proeutectoid-Ferrite and proeutectoid-Cementite starts forming at the grain boundaries of the Austenite. Then why is it so that proeutectoid-cementite forms a network of grain boundaries whereas proeutectoid-ferrite simply separates out from the grain boundary? And today is Guru Purnima... shat shat naman apko guruji.
It is simply because the volume of proeutectoid cementite in hypereutectoid steels is much less. Thus it simply decorates the grain boundary. In contrast, the volume of proeutectoid ferrite in hypoeutectoid steels is much larger. So it grows inward to larger distances away from the gb.
The difference in mechanical properties comes from the difference in %C. Hypo had low C and hyper has more. Higher the %C higher is the amount of hard and brittle phase Cementite in the alloy. Thus higher C steel will be harder and more brittle than lower C steel.
I had a little query sir, please answer this. The amount of proeutectoid Fe3C in the microstructure just above eutectoid horizontal should be same as in the microstructure just below it as it is the max amount of proeutectoid Fe3C. But here it's different. Why is it so?
Sir you have drawn three microstructures. Second one is for the point just above eutectoid horizontal and third one is for the point just below the eutectoid horizontal. In second microstructure Fe3C is present only at some places in the grain boundaries but in the third one Fe3C is present at every place in the grain boundaries, from here I inferred that amount of proeutectoid Fe3C is more in the third one than the second and therefore asked the question.
Can anyone explain why a proeutectoid cementite forms as a network rather than as a separate grain unlike proeutectoid ferrite ? Is it only because there is insufficient cementite as briefly hinted at the end of this video ?
The volume of proeutectoid ferrite is much larger than proeutectoid cementite. Hence proeutectoid cementite simply deposits in the grain boundary only whereas proeutectoid ferrite goes inside the grains away from the grain boundary also.
Sir at 0.45 you said hypoeutectoid ferrite but in previous lecture you called is as proeutectoid ferrite now I am confused please help thank you sir for this wonderful lecture series
We use hupoeutectoid and hypereutectoid to indicate the C concentration of steel with respect to the eutectoid steel, i.e. 0.8% C. A steel with less than 0.8% C is called hypoeutectoid, one with more than 0.8% C is called hypereutectoid. Proeutectoid and eutectoid are used to indicate the history of formation of ferrite in the microstructure. If ferrite forms from austenite, independently of cementite, it is called proeutectoid ferrite. If it forms jointly with cementite, as pearlite, it is called eutectoid cementite.
Finally the last Video. Thankyou very Much Sir. You teach with so much patience. Love from Pakistan
This playlist covered everything I wanted to know. Thank you, you are a wonderful professor
After this i can say i know phase diagrams in detail ..thank you so much sir
Thank you so much sir
You just helped me to clear my semester in second year.You are a next level teacher.
Hats off to you
Keep helping us in the future with mechanical engineering courses.
This was great, I'm doing an internship on archaelogical iron and steel and this helped put what I had already learned into perspective, thanks a lot!
A teacher with great talent in teaching.All the concepts covered in this series are clear.Love the lectures.Thankyou so much sir..
explained the whole FME 353 FE3C subtopic starting from scratch!! great guy this one!
This Prof is wonderful ! Thanks for all the lectures.
Thank you so much, sir... I understand it much better now. 😌
Simple explanation. But all perfect. Thank you sir
Thank you professor for explaining this phase diagram chapter in very simple manner😇👍
The topic of phase diagrams had me scratching my head and didn't understand what was happening at all in my uni lectures. But after watching the lectures in this playlist, i think im defo gonna ace my exam. Thank you so much, professor 👍
All the 15 videos are so helpful and good explanation.. At last I gained knowledge in particular concept... Thank you sir
thank you very much i have been trying this but i couldnt get it..... and now from your video i understand everything
After complete all lecture I have confidence thanks sir ji
iit delhi is lucky to have you sir
Thank you very much sir much needed one
Sir, Both proeutectoid-Ferrite and proeutectoid-Cementite starts forming at the grain boundaries of the Austenite. Then why is it so that proeutectoid-cementite forms a network of grain boundaries whereas proeutectoid-ferrite simply separates out from the grain boundary?
And today is Guru Purnima... shat shat naman apko guruji.
It is simply because the volume of proeutectoid cementite in hypereutectoid steels is much less. Thus it simply decorates the grain boundary. In contrast, the volume of proeutectoid ferrite in hypoeutectoid steels is much larger. So it grows inward to larger distances away from the gb.
this last video gives sukoon to evryone 😄😄😂
Great explanation. Thanks.
Thank you so much sir ! for this wonderful lecture on phase diagram
Thank u sir, for wonderful teachings❤️....
After all these lectures now I can write the exam
what are the differences in mechanical properties of hyper-eutectoid and hypo-eutectoid steels ?
The difference in mechanical properties comes from the difference in %C. Hypo had low C and hyper has more. Higher the %C higher is the amount of hard and brittle phase Cementite in the alloy. Thus higher C steel will be harder and more brittle than lower C steel.
@@introductiontomaterialsscience Thank you very much Sir.
best lectureee
I had a little query sir, please answer this. The amount of proeutectoid Fe3C in the microstructure just above eutectoid horizontal should be same as in the microstructure just below it as it is the max amount of proeutectoid Fe3C. But here it's different. Why is it so?
You are right in your statement. But why do you say it is different here?
Sir you have drawn three microstructures. Second one is for the point just above eutectoid horizontal and third one is for the point just below the eutectoid horizontal. In second microstructure Fe3C is present only at some places in the grain boundaries but in the third one Fe3C is present at every place in the grain boundaries, from here I inferred that amount of proeutectoid Fe3C is more in the third one than the second and therefore asked the question.
Can you upload peritectic phase diagrams as well?
They are not of much importance...
ty sir
0:50 sir I think this ferrite is pro-eutectoid ferrite not hypoeutectoid ferrite
Can anyone explain why a proeutectoid cementite forms as a network rather than as a separate grain unlike proeutectoid ferrite ? Is it only because there is insufficient cementite as briefly hinted at the end of this video ?
The volume of proeutectoid ferrite is much larger than proeutectoid cementite. Hence proeutectoid cementite simply deposits in the grain boundary only whereas proeutectoid ferrite goes inside the grains away from the grain boundary also.
thank you soo much sir❤
Sir at 0.45 you said hypoeutectoid ferrite but in previous lecture you called is as proeutectoid ferrite now I am confused please help thank you sir for this wonderful lecture series
We use hupoeutectoid and hypereutectoid to indicate the C concentration of steel with respect to the eutectoid steel, i.e. 0.8% C. A steel with less than 0.8% C is called hypoeutectoid, one with more than 0.8% C is called hypereutectoid. Proeutectoid and eutectoid are used to indicate the history of formation of ferrite in the microstructure. If ferrite forms from austenite, independently of cementite, it is called proeutectoid ferrite. If it forms jointly with cementite, as pearlite, it is called eutectoid cementite.