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Technical Discussions
Ch.Y.Xiao
Ch.Y.Xiao
04:11 Jun-22-2002
About metal hardness testing by eddy-current

Who can give me some suggestions about metal hardness testing by eddy-current?
Thanks.


 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
03:47 Jun-23-2002
Re: About metal hardness testing by eddy-current
: Who can give me some suggestions about metal hardness testing by eddy-current?
: Thanks.

Pl. describe clearly what you are looking for. If you prefer, you can contact me directly at .

Swamy



 
 Reply 
 
Sean Franklin
Sean Franklin
06:52 Jun-24-2002
Re: About metal hardness testing by eddy-current
:In addition to eddy-current, Resistivity – a basic principle of electricity - is a proven and widely used method of ndt to help determine the case depth and hardness of metal. The Physical Acoustics M100A Metal Inspector uses resistivity as it pulses a rapidly reversing direct current into the metal through a 4-point probe, and measures the metal’s resistance to the current flow.

Metal in a hardened state will always exhibit a higher resistivity to the flow of electricity than an unhardened metal because its grain structure has become more tightly packed through heat treatment. The greater the case depth of any given parts, the higher the resistivity reading on the M100A display screen. Likewise, annealing will bring the resistivity back down.

For further information, please contact Sean Franklin at Physical Acoustics Corporation, via Sfranklin@PACNDT.com or (609) 716-4088

: Who can give me some suggestions about metal hardness testing by eddy-current?
: : Thanks.
.
: Pl. describe clearly what you are looking for. If you prefer, you can contact me directly at .
.
: Swamy
.



 
 Reply 
 
David Forsyth
R & D
TRI/Austin, USA, Joined Nov 2001, 41

David Forsyth

R & D
TRI/Austin,
USA,
Joined Nov 2001
41
06:09 Jul-04-2002
Re: About metal hardness testing by eddy-current
Conductivity/resistivity measurements are not able to determine hardness in 7000 series aluminiums, see
http://www.ndt.net/article/aero1197/forsyth/forsyth.htm Figure 1, which should have an x axis label of conductivity. I do not know about other materials.

Dave.

: :In addition to eddy-current, Resistivity – a basic principle of electricity - is a proven and widely used method of ndt to help determine the case depth and hardness of metal.


 
 Reply 
 
SADIK SAYYED
SADIK SAYYED
08:55 Oct-12-2002
Re: About metal hardness testing by eddy-current and experimental set up for the same
: Conductivity/resistivity measurements are not able to determine hardness in 7000 series aluminiums, see
: http://www.ndt.net/article/aero1197/forsyth/forsyth.htm Figure 1, which should have an x axis label of conductivity. I do not know about other materials.
.
: Dave.
.
: : :In addition to eddy-current, Resistivity – a basic principle of electricity - is a proven and widely used method of ndt to help determine the case depth and hardness of metal. also tell me about experimental setup to determine the hardness by this method .

.



 
 Reply 
 

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