Magnetic Permeability vs. Temperature 1

[SSBN727]

We all know that iron will be completely demagnitized at curie's temprature of 769C...right? the demagnitization process start to increase with the appearance of Austnite at 723C....What about before that? I mean from 0C- 723C? what is the relationship between the magnetic permeability of iron and temp.? decrease gradually? no change till this temp? or what? Please , send me anything you have got on this...

Btw, this query was originally posted in the AWS forum and it seems that this PhD student did'nt like the response we gave her and she basically thought that we had made fun of her which is'nt true so, if any of you folks could help me try to reassure this person from Egypt that all we are trying to do is help but at the same time, we do'nt take kindly to folks coming into the AWS forum demanding us to give them answers yesterday!!! Especially with an attitude of arrogance!!!

 

[MagMike]

The magnetic permeability decreases with increasing temperature but non-linearly, there are good charts describing it in Bozorth's Ferromagnetism book. I recommend you get a copy.

 

[EdStainless]

It is funny Mike, but Bozorth is the only place that I have found that info. Have you seen what the book sells for now?

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[MagMike]

Hello Ed,

Bozorth's book is a gold mine of information. IEEE offers reprints for $140:

http://www.wiley.com/WileyCDA/WileyTitle/productCd-0780310322,miniSiteCd-IEEE2.html

I bought my copy back in 1993 when they first re-issued it. I don't remember how much I paid but it seemed expensive, especially since I was trying to get by on a grad-student's salary. Despite that, I consider it a good investment.

Mike

 

[EdStainless]

Mine was given to me by a mentor, second printing from '53.
It is good to see that they are re-printing.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net