Sunday, September 25, 2011

Re: [MW:12518] Uncontrolled heating and cooling effect of Carbon steel below lower critical temperature



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,

Limesh



On 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

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Thanks & Regards
Biplab Pal
Industrial Services, Inspection Engineer.
SGS India Pvt. Ltd.
Kolkata Branch
E-mail:   biplab.mech@gmail.com
 
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