Thank you so much. I've been struggling for a whole semester but thanks to you i finally understood everythig. Best regards
@fakel1ght5448 ай бұрын
Your voice makes me feel like ronaldo is teaching
@scayloredm59646 жыл бұрын
Had a few TTT questions on my exam and got them all correct because of this video, thank you. Well worth the watch.
@mertaypar88915 жыл бұрын
YOU ARE A SAVIOUR!!!!!!! I was sick at that lecture and i wasn't able to understand this from slides. Thank you so much, really really appreciated!!
@leungklund64316 жыл бұрын
Great video. I needed just this to ace my materials final exam. Thank you for sharing this.
@aaronmorgan24753 жыл бұрын
final? this is on my midterm
@christopherchen19946 жыл бұрын
Very helpful!! watched this 2hrs before my final paper and managed to grasp the concept
@azrilntdrill5 жыл бұрын
thank you !!! Why cant the profs in my school be as straight forward as you about this concepts.
@granttekell39394 жыл бұрын
Thank you so much Dr. Núñez!! This makes so much sense now!
@brielleibe85035 жыл бұрын
Wow, this was awesome! Made so much sense! Thank you so much, great video!
@EE-pq8yn6 жыл бұрын
very clear and great video with various of examples! Thank you!
@---js1vv6 жыл бұрын
This is VERY helful, Thanks Mr. Cesar!
@maarten-pz9oq Жыл бұрын
You are a legend, thank you!
@AndresMarroquinDude6 жыл бұрын
Thank you! Saludos de Texas.
@fatihakcay42605 жыл бұрын
Thaanks prof for the video. Ttt questions is nice!
@brightonpamire78745 жыл бұрын
wooooow, you've just made it simpler .AWESOME
@digontadey873 жыл бұрын
thanks a lot...now my math concept is cleared.
@boyanzhou16276 жыл бұрын
Much better than my material prof
@adityapaliwal50655 жыл бұрын
thank you so much. really helpful !
@ogantino5 жыл бұрын
gracias Cesar, saludos de Argentina!!!
@ashutoshshivarkar22563 жыл бұрын
thanks man great video
@rogerarbizo12426 жыл бұрын
Golden. Thank you muchas gracias
@antoniohernandez26346 жыл бұрын
Profe muy buen video. Saludos desde California
@cesar_nunez6 жыл бұрын
¡Muchas gracias! Un gusto saludarte.
@sanaaedderraz58546 жыл бұрын
Very helpful! Thank u soooooo much
@akaneru2905 жыл бұрын
U r the best, thank u very much...
@solounomas06 ай бұрын
Very clear explanation!!
@cesar_nunez5 ай бұрын
Glad you think so!
@fatihimral75636 жыл бұрын
very helpful video! thanks for sharing
@elmifarah26686 жыл бұрын
Thanks you from France
@yaowang51166 жыл бұрын
very helpful, thank you!
@jeanclaudematias32653 жыл бұрын
Thank you Very Much!
@assadsafaey4324 жыл бұрын
Thank you so much for your this helpful video
@alisolak31796 жыл бұрын
very heplful... thank you so muchhh !
@MrSpaceboyy6 жыл бұрын
you are the man
@bobobeckham7776 жыл бұрын
Thank You!
@nathanpollet36346 жыл бұрын
Thank you!
@meetrealestatemindset6 жыл бұрын
awesome lecture
@obadiahdadzie3056 Жыл бұрын
Thank you🔥🔥🔥🙇♀️🙇♀️
@mrmojojp15 жыл бұрын
Thank You
@SteveNashs13thfan6 жыл бұрын
very helpful! I just wish one example had one with tempered martensite or spheroidite, but a great video nonetheless
@cesar_nunez6 жыл бұрын
Thank you very much for your comment. Re-heating martensite to temperatures below 350° or above 600°C (always below the eutectoid temperature and avoiding the 375C-575°C Tempered Embrittlement range) will create tempered martensite, increasing toughness and lowering hardness. For spherodization, a perlitic microstructure should be re-heated below the eutectoid temperature for spherodites to form from the lamellar perlite. I haven't come accross a TTT Diagram showing these but typical aging curves (Property vs time for different temperatures).
@yunusbagc26246 жыл бұрын
kraaal kral
@streetview30454 жыл бұрын
thank you sir
@ncaastar3406 жыл бұрын
Kansas State Mech Materials represent!
@awaken57395 жыл бұрын
Thanks alot sir ☺️
@aquvamechanic52404 жыл бұрын
i got it teşekkürler
@Picky21066 жыл бұрын
Is it possible to calculate the resulting hardness of say example 2? would it be correct to say 50% Bainite at 41HRC and 50% Martensite with 57HRC results in a hardness of 20.5+28.5=49HRC? Thanks
@cesar_nunez6 жыл бұрын
On average, yes. What you propose is known as "The proportions rule" and it applies to this example in the way you present it. Excelent! It is important to recognize that, in reality, you will have regions with different microstructures and properties; hence, this average value might be of significance or not, depending on the purpose of your answer. For example, it might be that you have a harder surface than the core, which will be benefitial in applications where you need certain ductility for the whole element with a hard surface that might give it stiffness. In such case, this average might no be as imprtant as the distribution of microstructures.
@Picky21066 жыл бұрын
Thank you for your detailed answer and quick reply! very helpful!
@kayagunduz74905 ай бұрын
thanks sir
@cesar_nunez5 ай бұрын
Most welcome
@kiaamini32736 жыл бұрын
water boils at 100C which is equivalent to 212 F (Not 100F). does that not the first answer?
@ojehoziegbe91726 жыл бұрын
Kiarash Amini not really. If you see, the graph ends at about 200F
@tyan43805 жыл бұрын
Sorry i didn’t understand why u proceed the following steps all from 0 second , since ur calculation of percentage takes accounts of previous step loss of austenite ,they transformed into others, then to calculate whats left and what they are going to change further should start from the point of last step ending , The shape of transformation should be a staircase isnt it?
@cesar_nunez5 жыл бұрын
Excellent point! This is something which is not as straight forward as it might seems to be at first. Whatever we can discuss about this, keep in mind that TTT diagrams are made by quenching to ONE single temperature and waiting until full transformation; when using the TTT diagram in the way we do (quenching to several different temperatures) we are pushing the concept a little bit too far; none the less, it’s still a good first approach. Now, also keep in mind that, when quenching a material, heat transfer takes place at the surface of the material, so the center of the material is the last part to cool down; finally, we are working with a log-log scale, so that “numbers” at the far left are orders of magnitude smaller than numbers to the right; finally, control of temperature is not perfect in practice. Taking all this into account, although your idea is “quite right” it needs a small correction (and it would require to assume that the full material is at the same temperature everywhere at any time, which requires a very small sample with a very high relationship Area to Volume and a very high heat transfer coefficient); if that is the case, it wouldn’t be a “stair” but rather a “straight line” with a slope equivalent to the “cooling speed” of the quenching process departing from the starting cooling temperature. That is way, assuming that your quenching is fast enough (“very high” cooling speed), then the assumption of a straight vertical line (infinite slope) is the other option you have, and this is the one I’m using. In practice, what we need to do is a simulation of the heat transfer and analyzing the thermal path of each part of the material. That is way we also have the CCT Diagrams which it is a more practical option.
@jinx14386 жыл бұрын
allah yarhamlek l walidin :D
@kamilkarakaplan1293 Жыл бұрын
Cihangir hocama selamlar 😂😂
@lukeedward8934 жыл бұрын
roll tide
@DevinPlaysitAll6 жыл бұрын
I still don't get it. My professor is total garbage.