Age hardening I: Introduction

Age hardening I: Introduction

[@syedasad5731]

Extremely awesome, for the first time got interest to see the second part even though it is of higher running time. It was worthy to watch it too.....was searching for such a video ....well done sir..!!

[@riteshmule7727]

I will never forget this story in my whole life❣️ and I will not die before meeting you sir!

[@Shreejigovindhari]

Lol, Since maximum hardness is at its peak, hence it decrease after peak point or over aging 😂😂😂😂😂😂😂👌

[@shivampadmani]

Overaging vs Oversmart!!! LOL

[@siddharthgandhi6342]

Aa usual IITians being oversmart.

[@ajayjoshi9256]

best example of subltle humour and how material science can be fun to teach and learn. Thank you sir for your efforts. This is by far the best explanation on any subject in any of the nptel lectures i have come across. Thank you for your time sir.

[@anuragsamaddar3059]

I have never seen such a good teacher in my life.......such good teaching🔥Awesome Sir

[@andrazgasar222]

Thank you, a have a test tommorrow at my UNI and I've missed the lecture on this topic and you've really helped me a lot! Thanks again, I just love the videos you publish!

[@muntoia]

Finally an Indian which is speaking in a understandable way... Thanks professor

[@SIVARAGHURAMMVM]

Super teacher and interesting in understanding 😊

[@abhinavjagetia5239]

Thanks for sharing the awesome story. The lecture was really very informative not necessarily known and covered in classes.

[@darkwarrior_agentj3879]

Really good and patient explanation. Very good video.

[@Karmayogi_R]

Really you too good sir , thanks for these videos it make to me understand engineering materials well .......thanks for this ME series of videos . We love you sir

[@badayoutuber759]

God bless you sir , Best explanation ever.... Superb

[@panigrahiabhisek007]

Sir you have a good sense of humour😊

[@pleasesubscribe2987]

well explained

[@alchem1s7]

Thank you Mr. I got very interested with the explanation Greetings from Mexico

[@ranahamzakhudadadkhan5632]

Studying in Germany, listening to Indian Professor.🤗

[@lorenzodamian3667]

Thanks for your lecture. I works in aluminium extrusion factory. I would beg you to explained as easiest that you can for medium students like me. The process is heated billet 7 inch to 480C and extruded to 530C aprox and later tempering in a fan current 10 m ( to quenching 30 m/min) yo get 250C . And later agening. Thanks

[@Mechaworkstudy]

Well explained sir.

[@shreenivasap.h3073]

very good explaination ..i got information

[@Ponto22lr]

How does pressure affects the hardening process of aluminium?

[@Gaurav-rh3pq]

Thanx Sir,very well explained

[@ankushsaha007]

Sir thank u🙏,because of u one day i might try to persue phd in this subject

[@himanshushekhar4524]

Sir, why we do quenching in first step after solution treatment. ? Instead we can do Normalizing.

[@introductiontomaterialsscience]

If you do normalizing, that is slower cooling than quenching you may not be able to retain high temperature solid solution. Precipates will form while cooling itself. But this will happen at higher temperatures than used for aging after quenching. Precipates formed at higher tempeartures will be coarse and not as effective as fine ppts formed at lower aging temperatures.

[@bitankumarnayak8528]

Sir I love your research

[@Roberto-co4uk]

The cliffhanger at the end of this video reminds me of watching anime

[@deanharris7149]

Well made, thank you.

[@ShekharSuman1]

Nicely explained. Concept cleared.

[@Sharma3903]

Great explanation

[@zeeshanahmed9719]

Sir is there any method to get the alloy at maximum hardness after aging and prevent it from over aging?

[@teemum.9023]

Interesting

[@naveentheking962]

Thank you sir

[@kamohelot8677]

Very helpful 💯💯

[@HimanshuShekhar-ug1lq]

After solution Treatment we do ageing. in Ageing after holding the sample at elevated temp. do we have to necessarily do air cooling or can we perform water quenching .???

[@introductiontomaterialsscience]

After ageing, air cooling is sufficient.

[@himanshushekhar4524]

@@introductiontomaterialsscience you mean sir, we can do any of these Annealing, Normalizing and quenching??

[@introductiontomaterialsscience]

@@himanshushekhar4524 Cooling rate after aging should not matter. So you can either fast cool (quench) or skow cool (air) or very slow cool (furnace). Furnace cooling and air cooling in this case will not usually be called annealing or normalizing respectively. These terms are common for cooling of austenite phase in steel.

[@himanshushekhar4524]

@@introductiontomaterialsscience Thankyou very much much sir....a lot of things has been cleared. Thankyou once again for responding 🙂

[@samirmondal7781]

Sir I am a regular viewer of your material class's , please suggest me how to study material for gate because my gate paper is polymer science and material science

[@motiontv3621]

How was your gate exam.

[@TanmayM.63]

@@motiontv3621 🤣🤣🤣

[@fariz5091]

Hi, from micro structure aluminum we can get average size of precipitate and % distribution. what is the effect of each?

[@introductiontomaterialsscience]

Higher the average size of the precipitate lesser will be its effectiveness in strengthening. I am not really sure how the distribution will affect the properties.

[@sandeeprathee9859]

Superb

[@maheshdangeti3633]

Super sir..

[@zhangbarry1752]

Thanks.

[@vishu1650]

Ty very much sir

[@ryanfauzan5284]

sir, thank you so much.

[@saiputcha1730]

"Because peak hardening is highest by definition, it is the highest", Er,...with all due respect, how is that even a reason to why a material's hardness should decrease with over-aging?

[@rajeshprasad101]

It is NOT the reason.

[@saiputcha1730]

@@rajeshprasad101 I now understand sir that the reason is given in the next video. But, @10:35, it was said so, that's why I had a doubt.

[@introductiontomaterialsscience]

Actually it was my attempt at humour. But I can see now that it can create confusion.

[@lordchickenhawk]

@@introductiontomaterialsscience LOL!! I got it so it can't be all that confusing, I'm not THAT bright! :) ...which is why I really appreciate your video. Only somebody with a real grasp on their subject can make an explanation which the layman can then also grasp. Thanks!

[@ajayjoshi9256]

bhai wo majak tha . material science ke joke samajhne ke liye bhi concept clear hone chahiye. h

[@adiraaz7736]

at 10:35 , sir cracked a veri nice joke and nobody laughed out of ass except me :)

[@messimagic2527]

Sir you look like Nitesh Tiwari 😅...

[@gautamkumarsahu30]

Hahaha... Since the name is peak hardness, it has to decrease after that

[@bestcakesdesign]

Weekend defect😂

[@bepulbarua1947]

pran

[@LearningDentistry]

well explained

[@mjindia21]

Thanks sir.