woah..What an experience of interesting learning. Never thought that i would watch a lecture series with 140+ lectures, but it was your engaging and intresting way of teaching which has helped me in completeing the course in less than 10 days. Thank you sir.
Today, i finished the whole lectures series with 147 in numbers. The experience is unbelieving and unprecedented en masse. Being a metallurgy student we get very little kind of exposure to this level of knowledge due to lack of sources.So this was truly helping in many ways.I was kind of hoping a message to students since this has been a hell of a ride.But, i hope to see you soon with new course. Thank you sir.
Dear Sir, It took me 50 days to complete your whole lecture series, since I was watching many times the same lecture to understand the concepts new to me (Since I am from Mechanical background). Through this wonderful journey I saw many of them commenting "your lecture is too slow". I would definitely say, they said wrongly. Just because of the slowness, pen and paper method we may able to understand and visualize the concepts. Your lecture is very helpful for those who are taking lecture notes, for them it might feel like too fast. End of this would like to thank you sir from the bottom of my heart. Please do inspire many by posting this kind of lectures in future. I found two of your RU-vid channels and subscribed the same (Rajesh Prasad lectures on material science & Rajesh Prasad lectures). Waiting for your next lecture series sir.
This guy is another guy after Prof SK Som whose lectures have been finished successfully by me. Hats off to Prof Rajesh Prasad. Unique teaching style and concept clarity. Deserving person & larger than life in Material science. Two gems of IITs SK SOM & RAJESH PRASAD.
Finally, I have achieved a milestone. Being a Mechanical Engineer and having few knowledge about material is quite embarrassing for me. Thanks to you sir for giving me opportunity to learn this interesting module. I will ever grateful to you and your team.
This lecture course was fantastic. I really love how any lingering questions a viewer may have had were discussed, and I found your analysis very precise which I appreciated considerably. This was everything I could have wanted out of an introductory material science course and I wish there were free resources such as this for more topics. Thank you!
this the end of your lectures. Thank you sir.. i could clear my concept... your lectures were clear and simple to understand... i hope u come up with more topics because its a very vast subject
Just completed the whole series,will miss ur teaching sir as i continue my preparation journey,but im confident tht any new concept of material science i can now understand easily due to this strong base u helped me to create,thanx for inspiring all of us sir🙏 u have changed my life in some good ways sir🙏god bless you🙏
Finally complete all the lecture series sir in a 8 days span. It was really help me to understand the knowledge what i really had to the next level. The way of your teaching is amazing. I never saw this type simplified lectures. Especially before starting the new topics your giving the practical examples like [ form bicycle, crystal structure models, balloon experiment, paper experiment, titanic failure, cycle tube burst, spring experiment soon.....] its pick the attention, interest to learn. Get the essence of learning and understanding the concepts in a practical way. I need to mention one more thing sir, this is where most of the lectures missing that is inspiring the students by the stories of invention [like simple analogy to understand diffusion concept, different way of thinking of Brags got noble prize, invention of carbon nano tubes, and the story of sailing to find the new era of the aluminium alloys, Self questioning again and again in mechanical behaviour concepts, invention of X-rays ] these are all really inspired me. Now I can able to understand and analyse the hole subject and the knowledge where it exactly begin ? what is the origin of the concepts what we are learn today. How the people thinking in the olden days without any research facilities only by the thought processing come up with new ideas with help of those Today we are all build this advance technological society. Thank you so much sir, this course is really really help full to all the students who want know or learn and understand the day to day activities in a more scientific way irrespective of discipline. Sir, If possible come up with the new courses especially with the regard of Metallurgical and Materials engineering. We are all looking forward for you new course. Thank you so much sir.
Thanks for your great inspiring lectures...sir, you have done this with a lot of passion and dedication which was really felt at every second of this beautiful lecture . You are my inspiration to become a good teacher. Thank alot sir
Sir, I request you to make more videos on these topics NDT, CORROSION AND PREVENTION, PYROMETRY, METALLOGRAPHY(OPTICAL AND ELECTRON), POWDER METALLURGY, SURFACE IMPROVEMENTS
What a journey it had been... I spent my complete semester believing that MS is one of the most boring subject one could ever encounter...those TTT diagrams and PHASE diagrams were no less than a nightmare....but now I think those were the most beautiful diagrams I have ever scribbled on my notebook.
I have one question sir. As by increasing carbon Weight % in Plain carbon steel it's brittleness increases then why we are using Cast iron(weight% c > 2%) in lathe bed ?
Sir I finished your total lectures on the subject uploaded on the RU-vid and tried to go through some exercise problems. There I saw a question in heat treatment where upper critical temperature and lower critical temperature was mentioned in various questions. Can you please make a video on these temperatures and their significance in heat treatment???
The eutectoid temperature is called the lower critical temperature. Below this (ferrite + cementite) is stable. The temperature corresponding to austenite/austenite+ferrite boundary (for hypoeutectoid steel) or austenite/austenite+cementite boundary (for hypereutectoid steel) is called the second critical temperature. Above this, the single phase gamma (austenite) is stable.
@@kumardaksh6904 Well the question is both easy and difficult to answer. Easy at the thermodynamics level. Stability of a phase depends upon (at constant temperature and pressure) on its Gibbs free energy. The phase or a combination of phases which minimise free energy is stable. For eutectoid composition, the free energy of austenite is minimum above the eutectoid temperature. So it is the stable phase. But below the eutectoid temperature, it looses to a mixture of ferrite and cementite, which now have lower free energy. Now the difficult part. Well, all why questions are inherently difficult to answer. For example, one can ask why austenite has the lowest free energy above the eutectoid temperature? This is outside the purview of classical thermodynamics. One has to calculate free energies on the basis of more fundamental quantities like bond energies. This is the realm of statistical mechanics. Of course, one can still ask why? And one should. Till one finally gets stuck!! :-)
