I think this video lecture is the ultimate explanation of TTT diagram in my opinion! So detailed, elabroated, and thorough lecture. Thank you so much sir!
@sankalp71355 жыл бұрын
Sir, your teaching content is unparallel. This is GOLDEN!
@satyamsingh-js4hh5 жыл бұрын
So interesting video Sir..... Different colour are attractive..... It's perfect method to teach student.....
@unpluggedamit36473 жыл бұрын
Thats y he teaches in IIT D. Mera bhi sapna tha IIT ..but kya kare NIT mila...ussi me khus hu😥
@sudhirNITT Жыл бұрын
@@unpluggedamit3647 which nit
@waqasmuneer79514 жыл бұрын
Hats off. Mind blowing professor. Never understood the reason of finer and coarser grains. Also never paid heed to how TTT diagram is created. Amazing.... Thank you.
@Kuro-kappa3 жыл бұрын
this really helps me review basic metallurgy for my thesis. thank you, sir. respect.
@abhijitsinha53163 жыл бұрын
Which Iit?
@ptiwaridotin4 жыл бұрын
God bless you for this video, professors at Tier 3 universities can not match this even in their dreams.
@chakhla56143 жыл бұрын
If only such teachers existed all around!!❤️
@adityarathore70212 жыл бұрын
You make metallurgy very interesting, Sir! Thanks a lot.
@-NSanthosh4 жыл бұрын
Thank you 🙏 so much sir... No need of going to college.. ,Your videos are more enough to gain knowledge..
@lilly-ct6mkАй бұрын
Wow! thank you sir!!! May God bless you!!
@harshawardhandeore88814 жыл бұрын
This is the best explanation of TTT curve.... Thank you very much sir
@sarathbabu19905 жыл бұрын
Your teaching method and your knowledge of the subject are remarkable Professor.
@chaithanyaagurunathan45423 жыл бұрын
You are absolute Gem sir hats off to you
@ChenLin-jy2ev2 ай бұрын
Thank you very much. This video helps me a lot!
@jaya6227 ай бұрын
Remarkable...crystal clear explanation..Thanks a lot Sir
@Hogward9.511 ай бұрын
Thanks for this amazing lecture sir. Very simple explanation with deep understanding.
@SoumilSahu4 жыл бұрын
What happens if the cooling curve touches the start curve twice and never hits the finish curve?
@itzshadhu6734 жыл бұрын
16:15 In Fast Cooling temperature range is lower than Slow Cooling And for Fast Cooling due to low temperature range we will get Fine Grains and for Slow Cooling due to High temp range we will get Coarse Grains 20:00 In case of Quenching 22:20 we will get Glass or Amorphous Solid
@nhatle78594 жыл бұрын
I have a question. Why during the crystallization, does the temperature decrease? I think the temperature should be supposed to keep constant.
@samlocr3886 ай бұрын
so nice of you to post this
@vishnusuresh1684 жыл бұрын
Being speechless after watching this video.... awzm sir.
@manojprasad21664 жыл бұрын
Very good video, would recommend 1.25 speed for viewing.
@niladrichakraborty37953 жыл бұрын
Nive understandable Lecture Sir. Thank you sir👏👏
@gregg.8612 жыл бұрын
Best video for Materials Science even seen. Help me get through PhD qualifying exam
@railwayvlogs68294 жыл бұрын
Thank you sir. It's outstanding.
@hal9000svk4 жыл бұрын
Thanks for the video. Can anyone help? I would like to find out how to find out what quenching time is needed to achieve bainite transformation (bainite hardening) in chromoly alloy steel 42CrMo4 (SAE 4140). For example when I use oil as quenching medium with constant 350°C and I then I dip chromoly workpiece with austenite temperature into it and I need to know for how long it should stay in the oil and if there is a max time that can not be exceeded.
@ishanbasketball17193 жыл бұрын
beautifully explained the ttt diagram concept
@parmalchouriya7385 жыл бұрын
Great video sir and you are also great ☺☺☺☺
@etes4 жыл бұрын
Sir, there can be a cooling curve in between nose of green curve and red curve, which cuts the green line but doesn't cut the red line. What would be out come of such curve?
@nhatle78594 жыл бұрын
Sir, I have a question. Why when you supercool the liquid, during the crystallization, does the temperature decrease? I think the temperature should be supposed to keep constant.
@lokeshpadyal90013 жыл бұрын
Valuable lecture ....thank you sir
@madhuriwawre19215 жыл бұрын
Awesome sir.. very student friendly teaching methodology... 🙌
@adarsh73074 жыл бұрын
awsm explanation .....
@ashabajpai39213 жыл бұрын
If two identical materials are cooled with same cooling rate but one is cooled from say 820 and the other from 790, transformation temp of former being higher ,will it have coarser grains?
@abhiseknayak60633 жыл бұрын
Sir what will we get on cooling at upper critical cooling rate (the cooling line just touch and pass to the Ts curve) ?
@sarafaaani Жыл бұрын
tommorow is our end-sem, thanks professor!
@AakashKumar-gl2fk4 жыл бұрын
Thanks sir for your easy explanations
@aiynasharma3347 Жыл бұрын
Amazing explanation
@kishorkumarkumawat7007 Жыл бұрын
Very nice lecture sir. Well explained.
@LoneWolf-zj8it5 жыл бұрын
thank you for that last interesting fact ;-)
@suryasen98955 жыл бұрын
Excited to study what happened in the nxt lecture
@praveenbhyan17223 жыл бұрын
a very good explanation sir
@ravindunethmina75493 жыл бұрын
thank you sir for clear explaining.......
@pramitril13 жыл бұрын
After Coarse Pearlite is formed then I quench it to room temperature what I will get?
@introductiontomaterialsscience3 жыл бұрын
It will remain coarse pearlite. Once austenite is transformed, no further transformation is expected.
@rishi_d_mango3 жыл бұрын
this is fantastic.
@secretsoul93192 жыл бұрын
Indebted to u the GEM💎🙏🙏🙏
@johns.khalkho98313 жыл бұрын
Sir, will you please explain under what conditions it is called fast cooling and slow cooling? And if we do water quenched aluminum composite what will be the effects on grains, will it developed finer grains?
@nc-pf3qm Жыл бұрын
Lets see it for iron...Water quenching of austenite is fast. So it will give martensite directly(fast cooling). Oil quench will give very fine pearalite,air cooling will give fine pearalite. Nd furnace cooling will give coarse pearalite.
@akashjha91944 жыл бұрын
Sir you said that for faster cooling,the temperature range for which transformation occurs is lower. Does this mean that the difference of upper and lower temperature values is lower than that for slow cooling? Because by observing the TTT diagram,it seems the other way around.
@rajeshprasad1014 жыл бұрын
It means that the start temperature for faster cooling is lower than that for the slow cooling. similar the end temperature for faster cooling is lower than that for slower cooling.
@akashjha91944 жыл бұрын
@@rajeshprasad101 Thanks sir I got it.
@gulamquadir10773 жыл бұрын
Dear Sir, thanks for the lovely explanation. I have one question, can any liquid be transformed to Glass by Quenching?
@introductiontomaterialsscience3 жыл бұрын
Yes. If you cool a liquid fast enough there is no time for atoms to organise in crystalline structure. Thus it becomes glass.
@gulamquadir10773 жыл бұрын
@@introductiontomaterialsscience thank you Sir
@IITian_shubham_shekhar_rajput3 жыл бұрын
Sir we've already seen that for an alloy, transformation occur at a range of temp.(except for eutectic composition)...but in TTT diagram phase transformation start and finished at the same temp...HOW IS THIS POSSIBLE??
@dipanjanpal27945 жыл бұрын
Cleared all the ambiguity regarding T-T-T diagram in the most effective manner. Excellent piece of teaching. Thank you very much sir.
@prakharkumar80245 жыл бұрын
Amazing teacher
@alokkumarnyati4 жыл бұрын
Nice lecture 👍
@itibalinong1060 Жыл бұрын
Wow What an explanation
@prakharbhalla94613 жыл бұрын
Sir since at temperature below and above the nose the transformation rate is small so shouldn't it be that the gap between start and finish curve along isotherm should be larger as compared to nose because larger the transformation rate less time it will take to transform
@abhiseknayak60633 жыл бұрын
Sir why we get coarse grains on low cooling rate and fine grains on higher cooling rate?? What is the cause behind this sir ?
@scientium8770 Жыл бұрын
16:20 You said that "On faster cooling, the temperature range over which the transformation happens is lower than in slower cooling."; but instead the temperature range increases in faster cooling. Like in the cooling lines you have drawn, the slower cooling line has a small temperature range(the vertical height) when compared to faster cooling. I am confused here. Please help!!
@introductiontomaterialsscience Жыл бұрын
What we mean is that at slower cooling the transformation starts at higher temperature.
@ankushsaha0073 жыл бұрын
Sir here at 16:19 the two cooling curve u took was it for water or alloy?because if its liquid water then its pure substance and pure substance solidifies at fixed temperature,if its alloy then how we are able to superimposed an alloy curve to an pure substance's TTT diagram?
@rajeshprasadlectures3 жыл бұрын
This example is of a pure liquid. When we say a pure liquid freezes at a fixed temperature, we mean the temperature at which solid and liquid are in thermodynamic equilibrium. Freezing will happen at this temperature only if the cooling rate is extremely slow to allow for equilibrium to be attained. At normal or faster cooling rates undercooling is possible, i.e., the liquid will remain as a metastable liquid even below the equilibrium freezing temperature. This liquid can thus solidify at a temperature below the equilibrium freezing temperature.
@ankushsaha0073 жыл бұрын
@@rajeshprasadlectures thanx a lot sir 🙏
@ronaldowijaya19013 жыл бұрын
Thanks for making this video
@sourabhsuryawanshi95222 жыл бұрын
Maza hi aa gya sir .
@mathateja16122 жыл бұрын
Below melting point how solid transfers to liquid
@jinbaofan89572 жыл бұрын
I love you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
@Zedafanfa Жыл бұрын
Ganda rei
@sriharanr54934 жыл бұрын
Super sir💥💥🤙
@palani80812 жыл бұрын
in heat treatment how liquid phase is coming?
@rajeshprasadlectures2 жыл бұрын
In this videoTTT diagram is drawn for solidification and not for heat treatment.
@monishreddy44663 жыл бұрын
Sir, which property of glass distinguishes it from solid and make it more of a liquid
@rajeshprasadlectures3 жыл бұрын
The distinction between crystal and glass is their atomic arrangement. In crystals the atoms are periodically arranged. Atomic arrangement in glass is disordered. The atomic arrangement of liquid is also disordered and in this sense, glass is compared to a liquid.
@adarsh73074 жыл бұрын
best lecturee
@etes4 жыл бұрын
7:15 Why would start of solidification late at lower temperatures?
@kareemmehdi4 жыл бұрын
You end up having so many grains that are so small they can’t really come together to form a solid
@Raj-er8fc4 жыл бұрын
See previous video bro. At low temp, atomic mobility is less so the nucleation and growth rate is less.so more time required for nucleation and growth
@sanjayyadavazam4 жыл бұрын
Thanks sir.
@user-sc1nd6gu7x3 жыл бұрын
Sir, thank you for your very nice explanation of TTT diagram, but i have a quesiton.. in this video, your diagram looks like CCT diagram, not TTT diagram because of the continuous cooling rate you draw... so.. isn't it a CCT diagram??
@introductiontomaterialsscience3 жыл бұрын
You have asked a serious question. And that points to subtle point regarding the difference between TTT and CCT. The diagram I have drawn is a TTT diagram. The CCT diagram does not have the lower part of C curve. So strictly speaking I should not draw a continuous cooling curve on these diagrams. I avoided discussion on CCT diagrams in these videos. So I did not go into these details and loosely drew continuous cooling curve on a TTT diagram, which in a strict sense is incorrect.
@user-sc1nd6gu7x3 жыл бұрын
@@introductiontomaterialsscience Ah.. now i see! Thank you so much for answering my question!
@anandh19674 жыл бұрын
Sir is that glass is called as martensite? And no doubt IIT is always good at teaching
@user-us5rk7sl3r5 жыл бұрын
Was he saying about the transformation of water or any other substances
@adityagarg2593 жыл бұрын
the present teacher's of APL102(IITD) are very bad when compared to you sir ❤️
@AnupKumar-wd1ln3 жыл бұрын
Sir, how the process of slow cooling or fast cooling is done practically?
@introductiontomaterialsscience3 жыл бұрын
Think of casting. Sand casting gives relatively slower cooling rate than die casting. And then there are techniques called rapid quenching where one cools so fast that one gets amorphous or glassy phase.