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.
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.
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.
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
Наука
Finally...after almost a decade I understood what is pearlite😭
What is it❓
The way you explain all the lectures are excellent, thank you very much sir
Best explanation ever. Thank you sir! Your videos are always good!
The way u explain outstanding 🙏🙏🙏
Sir u r simply amazing.......
Very good and comprehensive, Thank you, great job
Best lecture ever....best faculty in world....
Thank you very much for these hideous. It helps me a lot!
Awesome! Thanks.
Won't there be any grain or grain boundary eutectoid microstructure? If yes, then will each grain have two phases present in it?
I watched this video at 1.5x speed before exam. I understood at last ♥️
Thank you very Much
Thank u so much sir...u r grear god bless uu
Fantastic explanation sir thank you so much sir
Thanks ❤
Nicely explained sir ❤
best lectureee
Thanks
best teaching
Thankyou sir
very clear explanation..Thank youuuuuu!!!!!!!
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.
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
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.
Kindly make a video on Ti-Al phase diagram
sir please, can you provide the notes of this course
👌👌🙏🙏🙏🙏
i dont know why , my lecturers havent got these skills of teaching!!
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.
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.
how can i give this man money for these lectures
Can you reduce the font size or remove subtitles
Please use CC button on the bottom ribbon of RUclips screen.
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