MPI ASTM E 1444 15-5 MAT’l Linear indications

  • MPI ASTM E 1444 15-5 MAT’l Linear indications

    Posted by william on 28/11/2021 at 7:04 pm

    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.

    Anthony Wohali replied 7 months ago 2 Members · 1 Reply
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  • Magnetic Particle Inspection (MPI) (MT)

    Anthony Wohali

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    28/11/2021 at 7:09 pm
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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.

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