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Technical Discussions
Chris
Chris
06:35 Nov-13-2006
How to measure the depth for case hardened steel?

Any suggestions. Thanks.


    
 
 
Nigel
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1094

Nigel

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
06:33 Nov-14-2006
Re: How to measure the depth for case hardened steel?



    
 
 
Phil Thayer
Sales, -
MISTRAS Products & Systems, USA, Joined Feb 2002, 12

Phil Thayer

Sales, -
MISTRAS Products & Systems,
USA,
Joined Feb 2002
12
00:53 Nov-14-2006
Re: How to measure the depth for case hardened steel?
You can use resistivity (M100A) to measure case depth by correlation. Also possible is UT methold. Please see NDTAutomation.com web site.

----------- Start Original Message -----------
: : Any suggestions. Thanks.
: No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: If you can access (or buy) special equipment, go to this link:
: http://www.worldoftest.com/casedepth.htm
: I suggest you Google the topic for further info.
: Hope this helps.
: Nigel
------------ End Original Message ------------




    
 
 
Chris
Chris
02:50 Nov-14-2006
Re: How to measure the depth for case hardened steel?
Thanks. I am looking for nondestructive methods.

----------- Start Original Message -----------
: : Any suggestions. Thanks.
: No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: If you can access (or buy) special equipment, go to this link:
: http://www.worldoftest.com/casedepth.htm
: I suggest you Google the topic for further info.
: Hope this helps.
: Nigel
------------ End Original Message ------------




    
 
 
Chris
Chris
02:50 Nov-14-2006
Re: How to measure the depth for case hardened steel?
Thanks. I am looking for nondestructive methods.

----------- Start Original Message -----------
: : Any suggestions. Thanks.
: No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: If you can access (or buy) special equipment, go to this link:
: http://www.worldoftest.com/casedepth.htm
: I suggest you Google the topic for further info.
: Hope this helps.
: Nigel
------------ End Original Message ------------




    
 
 
Chris
Chris
02:57 Nov-14-2006
Re: How to measure the depth for case hardened steel?
Does the M100A apply the four-point direct current potential drop (DCPD) method? Thank.


----------- Start Original Message -----------
: You can use resistivity (M100A) to measure case depth by correlation. Also possible is UT methold. Please see NDTAutomation.com web site.
: : : Any suggestions. Thanks.
: : No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: : If you can access (or buy) special equipment, go to this link:
: : http://www.worldoftest.com/casedepth.htm
: : I suggest you Google the topic for further info.
: : Hope this helps.
: : Nigel
------------ End Original Message ------------




    
 
 
Sayed H. El-Nekhaly
R & D
Delta Steel Mill Company, Egypt, Joined Jun 2006, 7

Sayed H. El-Nekhaly

R & D
Delta Steel Mill Company,
Egypt,
Joined Jun 2006
7
06:15 Nov-15-2006
Re: How to measure the depth for case hardened steel?
You can use metallurgical optical microscope in metallography, but inspection must be located on the cross section direction of the sample without any etchant




    
 
 
Phil
Sales, -
MISTRAS Products & Systems, USA, Joined Feb 2002, 12

Phil

Sales, -
MISTRAS Products & Systems,
USA,
Joined Feb 2002
12
04:38 Nov-15-2006
Re: How to measure the depth for case hardened steel?

Yes, 2 outer probes inject a constant current while the inner probes measure the IR drop. This can easily be correlated to a hardness value.

----------- Start Original Message -----------
: Does the M100A apply the four-point direct current potential drop (DCPD) method? Thank.
:
: : You can use resistivity (M100A) to measure case depth by correlation. Also possible is UT methold. Please see NDTAutomation.com web site.
: : : : Any suggestions. Thanks.
: : : No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: : : If you can access (or buy) special equipment, go to this link:
: : : http://www.worldoftest.com/casedepth.htm
: : : I suggest you Google the topic for further info.
: : : Hope this helps.
: : : Nigel
------------ End Original Message ------------




    
 
 
Michael Dalichow
Michael Dalichow
08:32 Nov-15-2006
Re: How to measure the depth for case hardened steel?
----------- Start Original Message -----------
: Any suggestions. Thanks.
------------ End Original Message ------------

We have developed an ultrasonic technique to measure the case depth of induction hardened materials, such as bearings, crankshafts, spindles, etc., nondestructively. Several systems costumized to various applications are on the market since 1994. Please logon to our website for more information or or contact me via email at mhd@qnetworld.com.
I hope this helps.
Michael



    
 
 
Chris
Chris
02:28 Nov-15-2006
Re: How to measure the depth for case hardened steel?
Thanks, Phil. How good is the correlation? Most of the parts are large long bars. Is it ok to measure with M100A? How about small parts?


----------- Start Original Message -----------
:
: Yes, 2 outer probes inject a constant current while the inner probes measure the IR drop. This can easily be correlated to a hardness value.
: : Does the M100A apply the four-point direct current potential drop (DCPD) method? Thank.
: :
: : : You can use resistivity (M100A) to measure case depth by correlation. Also possible is UT methold. Please see NDTAutomation.com web site.
: : : : : Any suggestions. Thanks.
: : : : No special equipment? Can you sacrifice an item? If so, machine it obliquely and then sequentially microhardness by staggered locations (so that indentations do not interfere with one another).
: : : : If you can access (or buy) special equipment, go to this link:
: : : : http://www.worldoftest.com/casedepth.htm
: : : : I suggest you Google the topic for further info.
: : : : Hope this helps.
: : : : Nigel
------------ End Original Message ------------




    
 
 
Chris
Chris
02:31 Nov-15-2006
Re: How to measure the depth for case hardened steel?
Thanks. Could you please tell me how good is the correlation? Also, what is the advantages of UT over DCPD method?

----------- Start Original Message -----------
: : Any suggestions. Thanks.
: We have developed an ultrasonic technique to measure the case depth of induction hardened materials, such as bearings, crankshafts, spindles, etc., nondestructively. Several systems costumized to various applications are on the market since 1994. Please logon to our website for more information or or contact me via email at mhd@qnetworld.com.
: I hope this helps.
: Michael
------------ End Original Message ------------




    
 
 

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