where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

426 views
Technical Discussions
Maarten Nijsse
Trainee
Smit, Netherlands, Joined Dec 2004, 2

Maarten Nijsse

Trainee
Smit,
Netherlands,
Joined Dec 2004
2
05:41 Dec-02-2004
The correlation of hardness versus distance of slitting-edge with core metal sheets and the deformation of the metal properties.

Recent investigations of magnetic en mechanical properties during mechanical cutting of non-oriented electrical steels have shown deteriorating effects. At the cut edge of the steels (with a thickness of 0.65 mm) a hardening has occurred. This is the result of plastic deformation where mechanical energy, which is used to make the cut, is absorbed by the lattice through a shift of the neighbouring layers and the appearance of micro-structural defects.
According to a NEN-norm the hardness is related to the permeability which says something about the losses due to eddy currents (transformer-core). But at the moment I haven’t been able to find documentation which prove this with non-oriented electrical steels, thickness of 0.65 mm. Furthermore the increase of hardness can cause a problem when the sheets are further processed, here again is the lack of information that supports that. Is there anyone who can help me with any information on the topic described above?



 
 Reply 
 
Elmar van den Elzen
Engineering,
Lismar Engineering B.V., Netherlands, Joined Aug 2000, 15

Elmar van den Elzen

Engineering,
Lismar Engineering B.V.,
Netherlands,
Joined Aug 2000
15
09:01 Dec-05-2004
Re: The correlation of hardness versus distance of slitting-edge with core metal sheets and the deformation of the metal properties.
Hello Maarten,

The cutting will cause some deformation in the material and this will affect the mechanical hardness, the electrical conductivity as well as the permeability. This will be true for all ferromagnetic steel types. My guess would be that the deformation and the associated changes of the material properties will be very, very local.

Bye, Elmar van den Elzen

----------- Start Original Message -----------
: Recent investigations of magnetic en mechanical properties during mechanical cutting of non-oriented electrical steels have shown deteriorating effects. At the cut edge of the steels (with a thickness of 0.65 mm) a hardening has occurred. This is the result of plastic deformation where mechanical energy, which is used to make the cut, is absorbed by the lattice through a shift of the neighbouring layers and the appearance of micro-structural defects.
: According to a NEN-norm the hardness is related to the permeability which says something about the losses due to eddy currents (transformer-core). But at the moment I haven’t been able to find documentation which prove this with non-oriented electrical steels, thickness of 0.65 mm. Furthermore the increase of hardness can cause a problem when the sheets are further processed, here again is the lack of information that supports that. Is there anyone who can help me with any information on the topic described above?
------------ End Original Message ------------




 
 Reply 
 

Product Spotlight

CIVA 2020 UT Module

CIVA NDE Simulation Software is the world leader of NDT Simulation. The UT simulation Module incl
...
udes: - "Beam computation": Beam propagation simulation - "Inspection Simulation": Beam interaction with flaws or specimens The user can simulate a whole inspection process (pulse echo, tandem or TOFD) with a wide range of probes (conventional, Phased- arrays or EMAT), components, and flaws.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

GUL Subsea Solutions - Screeening & Monitoring

To inspect new and existing subsea lines, you need proven technology and experience. GUL offers it's
...
technology to solve this challenge: GUL Subsea and gMAT Transducer Rings.
>

Magnetic X-Ray Pipeline Crawler 6''-60''

Suitable to work in 6''-60''diameter with speed of up to 18m/min, Max. moving diatance 5 kilometer
...
s and provide the efficient inspection of the pipeline.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window