Tempering

Tempering

[@Qahtani_Guy]

greetings and respect from Saudi Arabia, thanks to everyone who contributes to making these lessons.

[@Varun-wy3ef]

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]

Accha hai.......🤣🤣🤣

[@naveenreddy2682]

Thanku so much sir. Such a clarity on the subject we can get only in NPTEL videos.

[@mohitpharal9430]

Magical lecture

[@pr10510]

Superb Concept 👍👍👍.

[@hhhj538]

Sir m a great fan of u sir....

[@siddharthjena2189]

Sir,why and how epsilon Fe2.4C is formed in the first stage? from where 2.4 came?

[@rajorshikoyal4397]

Why are tool steels subjected to multiple tempering?

[@kalimuthum2045]

Very good.. Sir thanks

[@smarajitpunaykanti6463]

Beautiful slide

[@hazemomar1156]

how much we hold for tempring or austenizing ? there is aformula to calculate that time ?

[@priyanshusinha1209]

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??

[@adarsh7307]

awsmmmm

[@mdeqtedaralam9242]

Sir...1st time in my life i study material science in such type conceptual step...Sir Please... Upload All topics of material science...

[@adarsh7307]

it would have been better if tempering was drawn on TTT curvvee

[@mohitpatidar7882]

Is Martensite a phase or a micro-constituent ?

[@introductiontomaterialsscience]

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.

[@darshanambule6741]

phase with BCT structure

[@harikrishnan3112]

Hi sir. What is the lower limit of reheating temperature??

[@Gautamkumar-fy5bo]

noice

[@juliogarcia6224]

i have finished the video the explanation is correct

[@mdeqtedaralam9242]

Sir... If you have written a book on material science...please reply the name....

[@sanjaypathak4844]

Hardness - Martensite > Troosite > Sorbite > Spheriodite

[@raghareddy7650]

Is it correct that, troosite, sorbite and spheriodite are the types of tempered martensite

[@nageshbhatnagar3039]

The metals grows plastic with temperature. Can we say austenitic steel is much plastic than alpha ferrite?

[@introductiontomaterialsscience]

What you can say that austenite is deformed plastically more easily than ferrite. Austenite is more plastic than ferrite does not sound good.

[@ss25ss]

what cooling media we use, air or water for tempering?

[@shivangsingh5834]

We could get good grain structure in air cooling so I think we use air as a cooling mediam in tempering

[@naveenkumarkatkoju774]

Sir, is tempering is nessary where bainite in austempering process...

[@introductiontomaterialsscience]

No, austempered material need not be tempered.

[@andytholung5169]

Sir so which wud b best quenching, oil or water? Pliz

[@ShyamSundar-vu2pp]

Oil

[@ankushsaha007]

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]

No, there is no need to quench after tempering. Slow cooling will do.

[@ankushsaha007]

@@introductiontomaterialsscience thanx a lot sir🙏

[@shivangsingh5834]

@@introductiontomaterialsscience sir we cooled it in open air or inside the furnace

[@introductiontomaterialsscience]

@@shivangsingh5834 We can cool in the open air.

[@pkPahari]

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

[@pkPahari]

kya bna skte h

[@juliogarcia6224]

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

[@13-ahmedmohamedhassan73]

if i quenched from 820 to 25 degree celsius and then reheated to 700 for 24 hours is it tempered martensite or spherodite

[@sanjaypathak4844]

Tempered martensite hi Spheriodite hai
Alag alag temperature ke tempered martensite ko alag alag naam mila hai

[@sanjaypathak4844]

Spheriodite is name given to tempered martensite at that temperature.

[@Abhishek_Soni_DIAT_Pune]

Thank you sir.

[@burhanhaji769]

Thank you Prof

[@DeepakYadav-nq8yq]

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