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Technical Discussions
Björn Aurén
Björn Aurén
04:38 Feb-09-2001
How to measure martensite content

I work at Sandvik Steel, who among other things produce hardened/tempered strip steel. I wonder if anyone could think of a method for on-line non-destructive determination of small amounts of martensite in an austenitic matrix? The main crux is that we need to be able to measure simultaneously at three spots across the width. The device should preferrably be small and portable and able to measure thicknesses between 0.05-3 mm.

Eddy currents? Barkhausen noise?


    
 
 
G. NARDONI
Director
I&T Nardoni Institute, Italy, Joined Dec 1999, 4

G. NARDONI

Director
I&T Nardoni Institute,
Italy,
Joined Dec 1999
4
09:18 Feb-09-2001
Re: How to measure martensite content
Dear Bjorn Auren
You are right ! Barkhausen noise can help you very much on estimate a change
in structure in the ferromagnatic matrix . We work a lot with Barkhausen
and one of its application is the mapping of hardened structures through
oxycut , welding , heat treatment , or others .
We have equpment and technicians specialised at the applied School of Prof.
Vengrinovic of the Accademy of Science of Minsk who is one of the world
leader in Barkhausen effect application . We have recently held a seminar in
my Institute in Brescia- Italy on Barkhausen effect and the use of portable
instrumentation for different measurements .
We are available to make direct test on your spesimens . Tell us hello' !

Best regards

G. NARDONI

: I work at Sandvik Steel, who among other things produce hardened/tempered strip steel. I wonder if anyone could think of a method for on-line non-destructive determination of small amounts of martensite in an austenitic matrix? The main crux is that we need to be able to measure simultaneously at three spots across the width. The device should preferrably be small and portable and able to measure thicknesses between 0.05-3 mm.
.
: Eddy currents? Barkhausen noise?
.



    
 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 785

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
785
04:45 Feb-20-2001
Re: How to measure martensite content
Dear Bjorn Auren,

Have you tried Ferrite measurement, i.e. magnetic induction method with a small spot probe? Martensite is magnetic so it should work. Fisher's Ferritscope should be useful. It is certainly portable.

Would like to hear more from you about it.

Swamy

: Dear Bjorn Auren
: You are right ! Barkhausen noise can help you very much on estimate a change
: in structure in the ferromagnatic matrix . We work a lot with Barkhausen
: and one of its application is the mapping of hardened structures through
: oxycut , welding , heat treatment , or others .
: We have equpment and technicians specialised at the applied School of Prof.
: Vengrinovic of the Accademy of Science of Minsk who is one of the world
: leader in Barkhausen effect application . We have recently held a seminar in
: my Institute in Brescia- Italy on Barkhausen effect and the use of portable
: instrumentation for different measurements .
: We are available to make direct test on your spesimens . Tell us hello' !
.
: Best regards
.
: G. NARDONI
.
.
: : I work at Sandvik Steel, who among other things produce hardened/tempered strip steel. I wonder if anyone could think of a method for on-line non-destructive determination of small amounts of martensite in an austenitic matrix? The main crux is that we need to be able to measure simultaneously at three spots across the width. The device should preferrably be small and portable and able to measure thicknesses between 0.05-3 mm.
: .
: : Eddy currents? Barkhausen noise?
: .
.



    
 
 

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