Need X-ray or Ultrasonic spec suggestion
Need X-ray or Ultrasonic spec suggestion
(OP)
I need to x-ray & /or Ultrasonic test some parts made from Carburized AISI 9310 steel, 3 of 5 parts had heat treat cracks.
I need to verify the two parts do not have cracks below sub-surface. any recommendations?
parts past mag particle insp,but I want to make sure there are no defects at the center.
Thanks
Mfgenggear
I need to verify the two parts do not have cracks below sub-surface. any recommendations?
parts past mag particle insp,but I want to make sure there are no defects at the center.
Thanks
Mfgenggear





RE: Need X-ray or Ultrasonic spec suggestion
Otherwise, have them UT scanned using 70-degree and 45-degree transducers "Client info -- No Cracks"
RE: Need X-ray or Ultrasonic spec suggestion
I not sure I under stand your statement
Yes the MPI was done with an fully rectified Mag. Isso Approved.
My understanding is Mag will detect surface defects same as
penetrant. X-ray & ultrasonic will detect sub surface defects. I am a levell II except I have not been in practice for xx number of years.
no X-ray? why please advise.
Mfgenggear
RE: Need X-ray or Ultrasonic spec suggestion
If the 3 parts were rejected due to surface-breaking heat treat cracks, why should you suspect the other 2 parts(already succesfully passed the MPI) have sub-surface cracks i.e. not heat treatment.
As your sector is aerospace I would guess part geometry may be complex and to PROVRE no sub-surface cracks present you will need to perform extensive NDT, both UT and RT as you have no idea of defect location. An odd random X-ray or a few UT scans will not guarantee freedom from haphazardly oriented cracks. That is process quality control's responsibility.
Talk to your Level III or approach Level III consultants.
RE: Need X-ray or Ultrasonic spec suggestion
we have a level 3 only in mag & temper etch,
we normally send out all x-ray or UT to an out side source.
hence I need a spec that details the actual procedure.
I no longer due NDT I am now an Mfg Engineer.
any suggestions
Mfgenggear
RE: Need X-ray or Ultrasonic spec suggestion
If failure analysis of the 3 cracked parts reveals the reason for the failure then you can perhaps understand why the other 2 parts did not fail and if there is any reason to suspect the internal quality of the material.
I dont feel this helps you much because its the old NDT bind - how much work and money is justifiable for the desired end result of a "No significant defect" report. Basically, what are the parts worth to you?
RE: Need X-ray or Ultrasonic spec suggestion
I understand
There is a in-process failure analysis for the corrective action from our Heat Treating Vendor.
To my experience it is very rare for 9310 steel to crack.
But I have two possible good parts that where acceptable to MPI. and that is all I am required by contract (ASTM E1444)&
Mil-Std-1907 Grade A except no Indications permitted.
base on that criteria could I apply it to X-ray ?
is there an equivlant ?
Thanks
Mfgenggear
RE: Need X-ray or Ultrasonic spec suggestion
As to "no x-ray / RT": crack orientation is very critical for detectability, and each RT costs money. Taking RT 'shots' every few degrees in a full 360-deg circle will be VERY costly. UT scanning is MUCH faster, thus much cheaper. Additionally, it is MUCH easier to find tight cracks using UT versus RT.
RE: Need X-ray or Ultrasonic spec suggestion
Very well thanks
Mfgenggear