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Sonotron NDT
Original developer and manufacturer of advanced ultrasonic instruments
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Technical Discussions
sen
sen
03:54 Sep-16-2004
MPI-crack detction

While testing a component after Heat Treatment a surface crack indiction is seen.how to judge wheater the crack has taken before
Ht or after HT.


 
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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
08:49 Sep-17-2004
Re: MPI-crack detction
----------- Start Original Message -----------
: While testing a component after Heat Treatment a surface crack indiction is seen.how to judge wheater the crack has taken before
: Ht or after HT.
------------ End Original Message ------------
One way would be to look within the crack for evidence of oxidation/scaling. If the crack was existing prior to heat-treatment, the crack faces would have been exposed to the furnace atmosphere and would show some scaling. If the crack was extremely tight and got opended up or if the crack was produced by stress relieving, the crack surfaces would be relatively clean and fresh.

Best wishes.

Swamy





 
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