inclusions v. stringers v. segregation???
inclusions v. stringers v. segregation???
(OP)
we make some pump gears from aircraft quality 52100 steel(not vac melted). Outside NDT house rejected 15 of 58 pcs for inclusions over spec. limit of .125"
When we mag. particle inspected in-house, the indications are long thin lines running length of part, almost perfectly straight to axis of shaft. Stock was 1.25" dia, most inications are on a .500 shaft
Our Level III thinks these lines are from the structure of the alloy, kind of a segregation, and not inclusions.
I am looking for any input as to what we are seeing and alternate methods of inspecting to verify.
Thanks
When we mag. particle inspected in-house, the indications are long thin lines running length of part, almost perfectly straight to axis of shaft. Stock was 1.25" dia, most inications are on a .500 shaft
Our Level III thinks these lines are from the structure of the alloy, kind of a segregation, and not inclusions.
I am looking for any input as to what we are seeing and alternate methods of inspecting to verify.
Thanks





RE: inclusions v. stringers v. segregation???
Did the contractor NDT firm also use WFMT (wet fluorescent magnetic particle) or other method of NDT? Was an ultrasonic examination performed to evaluate forging cleanliness?
Over the years, I have seen where surface conditions do produce reportable indications by WFMT (faint lines that are like seams). After careful local polishing, these indications disappeared and after confirmation by ultrasonic examination, the material was accepted for use.
RE: inclusions v. stringers v. segregation???
http://www
RE: inclusions v. stringers v. segregation???
TVP- what is a carbide stringer?
Thank you both for great info.
RE: inclusions v. stringers v. segregation???
http:
RE: inclusions v. stringers v. segregation???