greetings and respect from Saudi Arabia, thanks to everyone who contributes to making these lessons.
@Varun-wy3ef
6 жыл бұрын
Sir in my life I have not seen a teacher like u....truly speaking I respect u sir...soon let me become my aim then I will try to meet u once in my life
@aryamanchaudhary4546
5 жыл бұрын
Accha hai.......🤣🤣🤣
@naveenreddy2682
2 жыл бұрын
Thanku so much sir. Such a clarity on the subject we can get only in NPTEL videos.
@siddharthjena2189
2 жыл бұрын
Sir,why and how epsilon Fe2.4C is formed in the first stage? from where 2.4 came?
@hhhj538
5 жыл бұрын
Sir m a great fan of u sir....
@mohitpharal9430
4 жыл бұрын
Magical lecture
@priyanshusinha1209
4 жыл бұрын
Sir , I have a little doubt how does exactly microstructure controls the hardness?? Sir it is clear that quenching brings better hardness than annealing due to faster cooling rate,but why faster cooling increases hardness??
@pr10510
4 жыл бұрын
Superb Concept 👍👍👍.
@hazemomar1156
2 жыл бұрын
how much we hold for tempring or austenizing ? there is aformula to calculate that time ?
@harikrishnan3112
4 жыл бұрын
Hi sir. What is the lower limit of reheating temperature??
@rajorshikoyal4397
4 жыл бұрын
Why are tool steels subjected to multiple tempering?
@smarajitpunaykanti6463
3 жыл бұрын
Beautiful slide
@kalimuthum2045
4 жыл бұрын
Very good.. Sir thanks
@adarsh7307
4 жыл бұрын
it would have been better if tempering was drawn on TTT curvvee
@adarsh7307
4 жыл бұрын
awsmmmm
@mdeqtedaralam9242
5 жыл бұрын
Sir...1st time in my life i study material science in such type conceptual step...Sir Please... Upload All topics of material science...
@mdeqtedaralam9242
5 жыл бұрын
Sir... If you have written a book on material science...please reply the name....
@Gautamkumar-fy5bo
8 ай бұрын
noice
@juliogarcia6224
4 жыл бұрын
i have finished the video the explanation is correct
@mohitpatidar7882
5 жыл бұрын
Is Martensite a phase or a micro-constituent ?
@introductiontomaterialsscience
5 жыл бұрын
Both. It is a phase. And since it has distinct appearance in a microstructure it is also a microconstutuent. Contrast this with pearlie. It is not a phase as it consists of mixture of two phases: ferrite and cementite. But it has a distinct appearance in the microstructure, so it is a microconstutuent.
Is it correct that, troosite, sorbite and spheriodite are the types of tempered martensite
@13-ahmedmohamedhassan73
5 жыл бұрын
if i quenched from 820 to 25 degree celsius and then reheated to 700 for 24 hours is it tempered martensite or spherodite
@sanjaypathak4844
5 жыл бұрын
Tempered martensite hi Spheriodite hai Alag alag temperature ke tempered martensite ko alag alag naam mila hai
@sanjaypathak4844
5 жыл бұрын
Spheriodite is name given to tempered martensite at that temperature.
@ss25ss
3 жыл бұрын
what cooling media we use, air or water for tempering?
@shivangsingh5834
2 жыл бұрын
We could get good grain structure in air cooling so I think we use air as a cooling mediam in tempering
@ankushsaha007
3 жыл бұрын
Sir in tempering after holding it in temp below eutectoid temp when we cool it again,whts the rate of this cooling?is it same as quenching?
@introductiontomaterialsscience
3 жыл бұрын
No, there is no need to quench after tempering. Slow cooling will do.
@ankushsaha007
3 жыл бұрын
@@introductiontomaterialsscience thanx a lot sir🙏
@shivangsingh5834
2 жыл бұрын
@@introductiontomaterialsscience sir we cooled it in open air or inside the furnace
@introductiontomaterialsscience
2 жыл бұрын
@@shivangsingh5834 We can cool in the open air.
@nageshbhatnagar3039
4 жыл бұрын
The metals grows plastic with temperature. Can we say austenitic steel is much plastic than alpha ferrite?
@introductiontomaterialsscience
4 жыл бұрын
What you can say that austenite is deformed plastically more easily than ferrite. Austenite is more plastic than ferrite does not sound good.
@andytholung5169
4 жыл бұрын
Sir so which wud b best quenching, oil or water? Pliz
@ShyamSundar-vu2pp
3 жыл бұрын
Oil
@juliogarcia6224
4 жыл бұрын
It is incorrect the explanation because when you use tempering in a microestructure of martensite the heat tempeture shall be for below of A1 in this case, for below of 725°C to generate a microestructure acircular martensite
@naveenkumarkatkoju774
2 жыл бұрын
Sir, is tempering is nessary where bainite in austempering process...
@introductiontomaterialsscience
2 жыл бұрын
No, austempered material need not be tempered.
@pkPahari
5 жыл бұрын
sir tempering ke bare me four Objectives : At the end of this lesson, the trainee shall be able to ex...discribe tha intro..of tempering
Пікірлер: 48