16 years ago
I hope you guys can help; we have a major problem here! We manufacture
aerospace hardware. One job I'm working on now is a special A286
locknut (very expensive!). Before machining we have the bar
age-hardened On the spec it calls for metallurgical testing that
specifies no dual-plex grain structure. After testing it was found the
parts did have grain sizes from 2 to 8 (not good because that's a
dual-plex structure). The material is A286 AMS5731. We've been trying
to contact the metal supplier (Carpenter Technology) but they won't
respond at all. Meanwhile we bought more material and cut a 1-inch
sample piece to age and re-test before attempting to remake the job.
We've tried to re-solution and age but that didn't work, either. I've
been making sinilar parts for over 20 years and never had this trouble
before. What's going on?!?! I hope you can help before I tear the
rest of my hair off.