UPDATE: got back yesterday with the lab, apparently the delta phase did adequately dissolve in the solutioning leg of the H/T cycle, there were semi-continuous delta networks in the grain boundaries instead of non-continuous precipitates. I guess the delta transus was higher on this heat. Now I...
We send this part out for testing probably 12 times a year or so (each time we make it) and this lab sees Inco 718 parts all the time(from us in addition to other companies). May just be a machining fluke.
The AMS calls out for RT and Elev Tensile both passed with flying colors. Inco is usually the least of my worries as far as testing goes, but when it fails it sure gives me a headache. I am getting onto the notch train as well, seems a bit fishy that 3 samples failed within 2 hours of hanging on...
It is done with a smooth and notched combo. loaded with 100ksi (689MPa) for 23 hours then Incrementally increased by 5ksi every 8 hours until failure. The solution anneal ran as planned within the 1725-1850°F for the appropriate wall thickness. The lab performed the Age 1325-1400°F @8Hrs reduce...
I believe the S-R is done at 1200°F (649°C) according to the AMS. Required life is 23hrs failing on the smooth section. If a notch failure occurs the test is considered a failure regardless of time. In the notch section, we used to have a problem but as of recent (the last year or so), that has...
Good Morning All,
Kinda urgent issue. I had an N/S S-R test fail at 40+ hours in the notch for Inco 718 (AMS 5662/5663). Naturally we sent more material for the 3 redundant tests all of which broke in the notch in under 2 hours. I checked the solution H/T chart on our end and everything ran OK...
Boottmills,
I guess I forgot to mention that The engineering department is myself and the new engineer, and I have only been working here for a year and some change. The company is quite top heavy and I feel like I am being under compensated for my time and efforts.
I am in the same boat as designosaur, except I don't have much down time. All of my boss' work has been put on my shoulders and I simply don't have enough time in a 7-5 day to get it all done. To boot they expect me to train a new engineer probably 10 years older than I (24) to pick up the slack...
Why exactly is the scale an issue? Once you press the billet the scale should break off, I am just having a hard time figuring out why you would need to descale it. We Forge everything from 1020 to Incos and we do not descale, then again we do open-die forging.
Solids are solid for a reason:
Atomic-scale: the atoms in a lattice arrange ideally* in a close packed orientation, and in a best case will occupy a FCC or CCP formation at an efficiency ~74%(occupying as much space as possible)
*single crystal with no defects(ha)
Macro-scale: If you compare...
Came across a 52100 mill cert with the ams 6440 spec with the exception of continuous stencil. can someone please shed some light on what a continuous stencil is? is it some sort of heat# marking process?
We have not run a solution and precipitation cycle on 718 in some time and our program carried out an extra hour at the higher end of the precipitation cycle.
the AMS 6443 states that it gets 8 hours at 1325-1400, then cooled down to 1150-1200 (~1.5hrs) then held there for 8 hours. our cycle...
TVP,
With 6-4 and Ti in general aren't you worried about hydrogen contamination? Wouldn't CVD be a higher risk for that since the majority of the deposited atoms are carried by hydrogen atoms in some form or another?
So the Forging/HT process of F55 (ASTM A182) would be as follows:
1) Forging operation (simple forging IE pancake)
2) Air-cool
3) Solution Treat
4) Quench (depends on desired results as far as polymer, oil, water go)
So the quench really controls how the intermetallics form?
