Magnetic Particle Inspection (MPI) (MT)
Magnetic particle Inspection (MPI) is a non-destructive testing (NDT) process for detecting surface and... View more
MPI ASTM E 1444 15-5 MAT’l Linear indications
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MPI ASTM E 1444 15-5 MAT’l Linear indications
We had a lot of 127 pc sent to our finishing house for plating and NDT. We were notified that 57/127 pc were rejected for linear indications. We have made various other part numbers out of this same material and have not had a rejection previously. What would be some things to look into as a root cause per the attached photo? Any help steering me in the right direction would be helpful.
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1 Reply
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I would suggest metallographic cross-sectioning to verify crack presence and depth, and then acid etch the metallographic mount as well as remnants of the destroyed part to see if grinder burn/cracking occurred. First suspicion would be grinder check, which can be caused by poorly-controlled machining process.
