These phenomena has already been proved well before by scientists.These things are well explained by authors like Sidney H. Avner,George E. Dieter,Sir Allen Cottrel,William D. Callister,Herman W.Pollack etc. in their material science and metallurgy books.Because Austenite is the one plays a major role to form other phases or micro structure during cooling(Cooling rate has great significance in getting coarse or fine grained micro structure).For example,without austenite ,there is no martensite formation in carbon steel during rapid cooling(quenching) from above upper transformation temperature due to lattice shear(no time for diffusion) and I don't think that martensite simply exists as it is.These phenomena is well explained in CCT and TTT diagrams.If you have any different opinion or my understanding is wrong ,you are most welcome to explain it as I don't have much expertise in material science.Moreover, my query was about the phase changes with in the limit of lower critical temperature of Iron-Iron carbon equilibrium diagram during uncontrolled heating and cooling.
Furthermore,I didn't get what do you mean by 'prove' since I didn't claim any kind of invention in my query!!
Regards,
Limesh
On Sun, Sep 25, 2011 at 2:41 PM, muthu barathi <muthu_barathi@rediffmail.com> wrote:
Dear Sir,
Better you may make a trial experiment and prove it.
Thanking You,
Honesty is the best Policy
With Warm Regards,
Muthu Barathi P
Mobile No:00962788269821 (Jordan)
00962775401951
From: limesh M <limesh78@gmail.com>
Sent: Sun, 25 Sep 2011 12:53:25
To: materials-welding@googlegroups.com
Subject: Re: [MW:12515] Uncontrolled heating and cooling effect of Carbon steel below lower critical temperature
Dear Mr. Biplab,
As per my understanding,TTT (C-Curve)or CCT won't give any idea on my query.Both diagrams discussing about the phase changes occurs on cooling above upper transformation temperature.So,CCT or TTT gives information on austenite decomposition.For a hypothetical manner we can say above lower critical temperature on hypo-eutectoid steel as it contains partial gamma iron(austenite) and alpha iron(ferrite).
Regards,
LimeshOn Mon, Aug 22, 2011 at 4:12 PM, Biplab Pal <biplab.mech@googlemail.com> wrote:
You should go through TTT diagram.
On Sun, Aug 21, 2011 at 7:48 PM, limesh M <limesh78@gmail.com> wrote:
--Dear All,
Material : Carbon steels in between 0.008% carbon and 6.67 % carbon.
1.Is there any metallurgical changes(phase change) will occur other than pearlite,if I heat rapidly uncontrolled heating)low carbon steel just below or equal to lower critical temperature(723 C) as per iron-carbon equilibrium diagram?
2.1.Is there any metallurgical changes(phase change) will occur other than pearlite,if I cool rapidly (uncontrolled cooling, no quenching by any kind of liquid medium)low carbon steel from just below or equal to lower critical temperature(723 C) as per iron-carbon equilibrium diagram?
Regards,
Limesh
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
Thanks & RegardsBiplab Pal
Industrial Services, Inspection Engineer.
SGS India Pvt. Ltd.
Kolkata BranchE-mail: biplab.mech@gmail.com
Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. Myself accepts no liability for any damage caused by any virus transmitted by this email.
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
Treat yourself at a restaurant, spa, resort and much more with Rediff Deal ho jaye!--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding+unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment