I guess Fe3C will nucleate first. At 723 degree C, carbon diffusion is faster than Fe which helps carbon to cluster around Austenite GB, and if it's 25 atom percent, Fe3C will form.
Sir, above 725 degrees Celsius it is Gamma austenite right sir , it is not steel .?? Steel is only below 725 centigrade and at 0.8 it is eutectoid steel. So how come above above 725 at 0.8 composition it is eutectoid steel?
Irrespective of temperature and microstructure we will call an alloy of Fe and C containing 0.8% C as eutectoid steel. Similarly for hypo and hypereutectoid steels.
Sir I have 2 doubts 1) Eutectoid steels have structure of Pearlite alone or phases of ferrite and Cementite. 2) Hypo eutectoid steels have structure of Pearlite alone or phases of ferrite and pearlite. Which is correct sir.
Pearlite itself is a mixture of ferrite and cementite. Eutectoid steel will give only pearlite. Hypoeutectoid steel will have both pearlite and some ferrite, called proeutectoid ferrite, which is not part of the mixture.
Well, Fe-C diagram is the best practical example of eutectoid phase diagram. All heat treatment of steels depends essentially on controlling the eutectoid reaction.
yeah .. how the eutectoid start at 0.8 wt% of carbon after that i get 0.02wt% c for alpha and 6.7 wt% c for fe3c .. the total carbon in the composition is 6.72 wt%c when the reactoin start at 0.8 wt% c i dont understand that ..from where the exceed carbon come ?..please explain ?
@@anasalazazmeh5749 Hey I think u have misunderstood. The carbon is conserved. see the fe3c by percentage will be less in the total sum and alpha will be more it is not 50% alpha 50% fe3c
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Finally...after almost a decade I understood what is pearlite😭
What is it❓
Eutectoid Mixture of ferrite and cementite@@gyanendrakumar6751
The way you explain all the lectures are excellent, thank you very much sir
The way u explain outstanding 🙏🙏🙏
Best explanation ever. Thank you sir! Your videos are always good!
Best lecture ever....best faculty in world....
Very good and comprehensive, Thank you, great job
Sir u r simply amazing.......
I watched this video at 1.5x speed before exam. I understood at last ♥️
Thank you very much for these hideous. It helps me a lot!
Fantastic explanation sir thank you so much sir
Won't there be any grain or grain boundary eutectoid microstructure? If yes, then will each grain have two phases present in it?
best teaching
Which will form first from austinite - alpha or Fe3C?
Tricky question. Don't know :-(
I guess Fe3C will nucleate first. At 723 degree C, carbon diffusion is faster than Fe which helps carbon to cluster around Austenite GB, and if it's 25 atom percent, Fe3C will form.
Do you guys even study this in engineering
How can we calculate the % of gamma above eutectiod temperature in a 0.4% carbon steel?????
Bobs and Vegana
51.3% alpha above 725 in 0.4 composition
Sir, above 725 degrees Celsius it is Gamma austenite right sir , it is not steel .??
Steel is only below 725 centigrade and at 0.8 it is eutectoid steel.
So how come above above 725 at 0.8 composition it is eutectoid steel?
So, is it like no matter what is the temperature composition less than 2 is steel alloys and greater than 2 is cast iron ?? Sir
Irrespective of temperature and microstructure we will call an alloy of Fe and C containing 0.8% C as eutectoid steel. Similarly for hypo and hypereutectoid steels.
Thank you, Sir!
Sir I have 2 doubts
1) Eutectoid steels have structure of Pearlite alone or phases of ferrite and Cementite.
2) Hypo eutectoid steels have structure of Pearlite alone or phases of ferrite and pearlite. Which is correct sir.
Pearlite itself is a mixture of ferrite and cementite. Eutectoid steel will give only pearlite. Hypoeutectoid steel will have both pearlite and some ferrite, called proeutectoid ferrite, which is not part of the mixture.
Nicely explained sir ❤
Kindly make a video on Ti-Al phase diagram
i dont know why , my lecturers havent got these skills of teaching!!
Thank u so much sir...u r grear god bless uu
How can we use a eutectoid phase diagram from a practical point of view?
Well, Fe-C diagram is the best practical example of eutectoid phase diagram. All heat treatment of steels depends essentially on controlling the eutectoid reaction.
best lectureee
sir please, can you provide the notes of this course
very clear explanation..Thank youuuuuu!!!!!!!
Thank you very Much
how can i give this man money for these lectures
Thanks ❤
Awesome! Thanks.
super sir
Thankyou sir
Thanks
Can you reduce the font size or remove subtitles
Please use CC button on the bottom ribbon of RUclips screen.
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In eutecoid reaction composition of carbon is not balnced
Could you please explain?
yeah .. how the eutectoid start at 0.8 wt% of carbon after that i get 0.02wt% c for alpha and 6.7 wt% c for fe3c .. the total carbon in the composition is 6.72 wt%c when the reactoin start at 0.8 wt% c i dont understand that ..from where the exceed carbon come ?..please explain ?
@@anasalazazmeh5749 Hey I think u have misunderstood. The carbon is conserved. see the fe3c by percentage will be less in the total sum and alpha will be more it is not 50% alpha 50% fe3c
No.of dislikes shows that how ur teaching is