ua-cam.com/users/shortsg6yFmTTV43I?feature=shared Heat treatment, or heat treatment in English, is a process in which a material, usually a metal or metal alloy, is subjected to a controlled cycle of heating and cooling to change its physical and mechanical properties. This procedure is used to improve the hardness, strength, ductility, hardness, corrosion resistance and other characteristics of the material.
I am a bit confused because I saw a few videos on this subject and they said that hardening a metal will make it more brittle like on a knife it will pretty much shatter if there is enough force. You explained that hardening a metal improves its elasticity which is contrary to what brittle is. Was this just a mistake in the video or have I been taught the wrong things?
Hardening of metals is done by heating it above critical temperature( about 900 to 1100℃) and then rapid cooling it(quenching) this quenching is most important. We expect the material to get hard(scratch resistance) but getting internal stresses developed in quenching is what we don't expect. Because of this, the material becomes brittle. Hence to improve these elastic property and toughness, tempering is done after hardening. So as I said in video, depending on the temerature of heating and rate of cooling, these properties varies. Coming to your question, neither is wrong. It depends on the process carried out. Thanks for commenting. Hope it helps.
I really love and appreciate the way you broke down the heat treatment process and elaborating on each one. This is perfect for my materials and processes class!
Definitely not an expert at all but if you want to know what the temperature of a metal. Example: Steel. You will have to just look it up, I couldn't tell you because I am not an expert but the critical temperature is different from every single metal, it will never be the same, I suggest just looking up whatever metal you are working with.
Or if you are wanting to know what it is, I dont know that answer either, I could only guess that critical temperature is when the metal is significantly weaker like for steel when it gets strawberry red.
Theoretically critical temerature is temperature at which metal crystal structure changes. The lattice structure will be rearranged in material at this level.
Thanks , well explained ... several queries, what is critical Temparature ... what iis relevance of 723 Deg Celsius? What is the soaking time for hardening ? What is rate of cooling in Normalising ? Rate of cooling in quenching ? .. What are tempoartures for carburising ? Post carburising any hardening process is needed or carburising is enough ?
08:05 While hardening, internal stresses increases and it increases brittleness of the steel. To relieve these stresses and increase toughness of the material tempering is done.
The graph does not indicate increase in temp. It shows for higher carbon content the normalizing temp is more. For cooling you have to go downward along vertical line towarda decreasing temp. Hope it helps.
Explained Excellently... easily understood. Thank you. Searched and viewed lot of videos on heat treatment process..this is very easy and informative. 👍👍👍
I bought a l clamp from local store which is made by traditional blacksmith.the holes are not drilled but punched when hot. I tried to drill some holes but unable to do.i tried hss bit and also tried all the available special drill bits but drill bits become blunt.what could be the reason?
Almost the same. The difference between each process is that case hardening creates a thin layer on the surface. Surface hardening hardens the outer surface and keeps the core soft throughout the entire process.
Do or can steel chemical property change during heat treatment? I know the chemical composite can vary depending on the steel thickness and/or steel application. Each mill differents I know that.
No chemical composition does not change. There is rearrangement of lattice structure. E.g. BCC, FCC etc. Based on that Ferrite, austenite, martensite etc structures changes.
@@SELFENGINEER how do chemical composite change then? I know heat treatment is to bring up the hardness, toughness, anti-corrosion, etc etc of the steel.
@@7150285 These properties depends upon structure of iron molecule arrangement. If there is addition of carbon or oxidation occurs then chemical changes can be expected. Internal stresses also control mechanical properties.
@@SELFENGINEER so basically steel making process is molten steel being solidifed and then quenched, and then heat treated to enhance its mechanical properties and then quenched and cool down again? I know steel making process its a long process but those are the basics.
Ammonia is rich in nitrogen. When ammonia comes into contact with the heated work piece it dissociates into nitrogen and hydrogen. The nitrogen then diffuses onto the surface of the material creating a nitride layer. Credit: wikipedia
Your video is so precise and very much relevant to practical situations. I could really recognize it. May I know about you. Thanks again for the session.
good evening sir. I would like to know the heat treatment process to be followed for cnc collets. Kindly share your no. so that we can discuss few process.
For specific hardness properties, you need to control process parameters precizely. Everything that I have known is explained in the video. Still, feel free to ask questions here anytime.
Excellent introduction to heat treatment and classification. Very useful; thank you. Would be great if can elaborate on when to do different case hardening - carburizing, cyaniding etc. Thank you!.
Why is it not possible to make a metal more useful, heat treating can make it stronger, more resistant to impact, malleable, and ductile with just one process?
Thank you for your information. viewers can watch the video as per the understanding. The playback option provided by youtube helps to save time. Have no concern to use that!
clearly explained everything thanku
Thanks @Puvi Arasan
@@SELFENGINEERDr can I get your email
Well presentation sir .
nice video keep it up
Thanks please subscribe n share
Great explanation 👍👍👍👍
Very good explanation
Very very excellent video
Many many thanks
Nice sir 👍❤️
concise work. well good video👍
well explained, you can't believe it you saved my time ...keep going
exactly！
Thanks, will do!
simple sweet explanation 👍
Very nice explanation 🙏
Very helpful bro
Pantastic explanation sir
I really enjoyed the video, clearly understood
Thanks. Please subscribe and share to class mates👍
Super & easy to understand...
Nyz ... well explained bro
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Good job bro keep going
Good work
Thank you Gaurav Singh
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I love it when people say 'curie' instead of 'query'
Bengalis
Nice lesson. Thank you for the service.
Bhai🙌🙌,
Super n simple
Thank you Sir
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Thanks Aviator
Great video. Thank you!
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good
Thanks
Appreciated.. Thank you very much...
this video helped thank you.
Glad to hear it!
Tanx sir 👍👍👍
this helps me a lot in getting my assignment done. clearly explained thank you
Thank you. Please share to classmates.
Heated- held- soaked- cooled - inspected
Volume. Blowout speech voice nice
ua-cam.com/users/shortsg6yFmTTV43I?feature=shared Heat treatment, or heat treatment in English, is a process in which a material, usually a metal or metal alloy, is subjected to a controlled cycle of heating and cooling to change its physical and mechanical properties. This procedure is used to improve the hardness, strength, ductility, hardness, corrosion resistance and other characteristics of the material.
Thank you so much Sir
Thanks so much I really love ❤the the video
I am a bit confused because I saw a few videos on this subject and they said that hardening a metal will make it more brittle like on a knife it will pretty much shatter if there is enough force. You explained that hardening a metal improves its elasticity which is contrary to what brittle is. Was this just a mistake in the video or have I been taught the wrong things?
Hardening of metals is done by heating it above critical temperature( about 900 to 1100℃) and then rapid cooling it(quenching) this quenching is most important. We expect the material to get hard(scratch resistance) but getting internal stresses developed in quenching is what we don't expect. Because of this, the material becomes brittle. Hence to improve these elastic property and toughness, tempering is done after hardening. So as I said in video, depending on the temerature of heating and rate of cooling, these properties varies.
Coming to your question, neither is wrong. It depends on the process carried out. Thanks for commenting. Hope it helps.
Why we increase temprature when cooling
Hello thowfeek
ARE BHAI MZA AA GYA
OR INDICATION HARDENING DAL DETA TO OR MZA AAJATA
thanks. will try to do short video on it.
Sir please ye video se related mcq wale questions ka video banaye
I really love and appreciate the way you broke down the heat treatment process and elaborating on each one. This is perfect for my materials and processes class!
Thank you for taking your time to comment. This will keep me motivated. Keep sharing.
Simple and clear..have an interview..helped alot.. hope things go well
Best of luck buddy👍👍
Anna super anna
You've explained each and everything in a precise manner
Great video 👍
Please explain critical tempreture
Definitely not an expert at all but if you want to know what the temperature of a metal. Example: Steel. You will have to just look it up, I couldn't tell you because I am not an expert but the critical temperature is different from every single metal, it will never be the same, I suggest just looking up whatever metal you are working with.
Or if you are wanting to know what it is, I dont know that answer either, I could only guess that critical temperature is when the metal is significantly weaker like for steel when it gets strawberry red.
Theoretically critical temerature is temperature at which metal crystal structure changes. The lattice structure will be rearranged in material at this level.
@@SELFENGINEER Thank you. Can you tell me also what is the lower & upper critical temperature?
Sb kuchh btaya sath hi sath cooling medium bhi add kr dete bhai
Thanks , well explained ... several queries, what is critical Temparature ... what iis relevance of 723 Deg Celsius? What is the soaking time for hardening ? What is rate of cooling in Normalising ? Rate of cooling in quenching ? .. What are tempoartures for carburising ? Post carburising any hardening process is needed or carburising is enough ?
We have a question why we prefer tempering after hardening??
08:05
While hardening, internal stresses increases and it increases brittleness of the steel. To relieve these stresses and increase toughness of the material tempering is done.
Sir case hardening ko surface hardening bhi khte h kya sir pls reply jarur kijiye bs is confuse ko aap hi clear kr skte hai
Yes
Love you broter.please make more videos related metallurgy
1000👍 like by an mechanical engineer.
❤
Kani please teach about difference between annealing and normalising
thank god for 2x speed
Need 3x speed also
😂😂
After cooling the material in normalizing process how does the graph indicate an increase in temp
The graph does not indicate increase in temp. It shows for higher carbon content the normalizing temp is more. For cooling you have to go downward along vertical line towarda decreasing temp. Hope it helps.
Can add type of material suitable for each process?
Explained Excellently... easily understood. Thank you.
Searched and viewed lot of videos on heat treatment process..this is very easy and informative.
👍👍👍
I bought a l clamp from local store which is made by traditional blacksmith.the holes are not drilled but punched when hot. I tried to drill some holes but unable to do.i tried hss bit and also tried all the available special drill bits but drill bits become blunt.what could be the reason?
The surface became hard due to hot work.
Is that normalizing and tempering process are same?
No
Case hardening and surface hardening are different right?
Almost the same.
The difference between each process is that case hardening creates a thin layer on the surface. Surface hardening hardens the outer surface and keeps the core soft throughout the entire process.
Bro you explained very well . Best wishes for you
Sir. Why? When cooling the work piece to rearrange it's grain structure
Nice explain and I want you more updates.... any mechine, machanical used story's...thank you...💐💐
Sir hypereutectoid steel lct p milti h ya uct p
www.sciencedirect.com/topics/materials-science/hypereutectoid-steel
Do or can steel chemical property change during heat treatment? I know the chemical composite can vary depending on the steel thickness and/or steel application. Each mill differents I know that.
No chemical composition does not change. There is rearrangement of lattice structure. E.g. BCC, FCC etc. Based on that Ferrite, austenite, martensite etc structures changes.
@@SELFENGINEER how do chemical composite change then? I know heat treatment is to bring up the hardness, toughness, anti-corrosion, etc etc of the steel.
@@7150285 These properties depends upon structure of iron molecule arrangement. If there is addition of carbon or oxidation occurs then chemical changes can be expected. Internal stresses also control mechanical properties.
@@SELFENGINEER so basically steel making process is molten steel being solidifed and then quenched, and then heat treated to enhance its mechanical properties and then quenched and cool down again? I know steel making process its a long process but those are the basics.
@@7150285 Exactly!👍
Can I get the lecture in pdf or ppt format?
Check my blog named selfengineer4u.blogspot
Thank you bro
Nice content sir, but I think the channel name should be Self Engineering not Self Engineer
Thank you
👍👍👍👍👍
Why ammonia is used for nitriding?
Ammonia is rich in nitrogen. When ammonia comes into contact with the heated work piece it dissociates into nitrogen and hydrogen. The nitrogen then diffuses onto the surface of the material creating a nitride layer.
Credit: wikipedia
Your video is so precise and very much relevant to practical situations. I could really recognize it. May I know about you. Thanks again for the session.
Thank you for your valuable comment. This motivates us so much. Please share to relevant friends. Stay connected 👍 We are here
It's possible to understand and listen by using speed 1.75 on video
Do more videos
Sure
Simply explained
Tq bro
What about quenching?
Quenching is the process of rapidly cooling the heated metal/material by dipping it in water/oil/polymer bath kept at low temperature.
@@ketan99rider isn't it a type of heat treatment?
In case of Double compression type ferrule, front and back ferrule,how hardness can be increased of final finish product.
What is critical temperature?
Subtitle not required bez you explained the things which is already mentioned in slide
good evening sir. I would like to know the heat treatment process to be followed for cnc collets. Kindly share your no. so that we can discuss few process.
For specific hardness properties, you need to control process parameters precizely. Everything that I have known is explained in the video. Still, feel free to ask questions here anytime.
Please be giving sketches
Run video at 1.75 speed
Easily heat treatment explained , watch video below:
ua-cam.com/video/N82ExvWY0w0/v-deo.html
No promotion here please
Excellent introduction to heat treatment and classification. Very useful; thank you. Would be great if can elaborate on when to do different case hardening - carburizing, cyaniding etc. Thank you!.
Why is it not possible to make a metal more useful, heat treating can make it stronger, more resistant to impact, malleable, and ductile with just one process?
Unfortunately The metallurgy of material won't allow it.
Annealing does not harden the metal?
Annealing does not harden the metal. It actually increases toughness.
Played video at 1.75x and still it was slow😁
Thank you for your information. viewers can watch the video as per the understanding. The playback option provided by youtube helps to save time. Have no concern to use that!
Add the ppt link to download
selfengineer4u.blogspot.com/2020/07/heat-treatment-here-is-presentation-for.html
run the video at 1.25x for saving time.
Thanks for comment
B.MOHAN
201219014
Mechanical sandwich
SEC - D
SHIFT - 1
Playback speed 1.75x
Thank me later
I need your ppt
Bro speak loudly and properly we cant understand ur voice
Thank you for your feedback.
Please use ear/headphone if possible. I Will use good mic from now on
increase yours sound bro
Yeah bro I changed my phone now it's perfect
Play video on 1.25x.
Thank me later
WTF? How slow is this man speaking, i literally use 1.7x speed to watch this video
हिंदी में भी बताओ ।अंग्रेजी समझ में नहीं आ रहा है ।
You didn't even care to explain what is critical temperature
pretty basic stuff, if you didn't know what that is then you might wanna restart front preschool
the way you read it sucks! we might as well read it ourselves.