inconel 718 at 900C
inconel 718 at 900C
(OP)
can inconel 718 be suitable for use under stress above 900C?
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RE: inconel 718 at 900C
Come back with a little more ifromation about the use and stress levels required.
Can you change to another material?
RE: inconel 718 at 900C
we cannot change the material now: this is a large experimental device and the rods already in are 100s, no plan of touching all these tiles
however we can change the shot characteristics so that the energy dumped on these tiles is less - actually so far we limited it to keep the temperature below 700C, but under new "management" I've been pushed into investigate their use under higher heat loads
RE: inconel 718 at 900C
I checked with two of my high temperature users and both said your intended use is a little too high for the material.
RE: inconel 718 at 900C
Personally I do not think so, but I cannot find any journal paper or similar to make my point. Do you have a suitable reference?
RE: inconel 718 at 900C
http://www.specialmetals.com/products/inconelalloy718.h...
RE: inconel 718 at 900C
If anyone has any advice let me know.
RE: inconel 718 at 900C
http://www.grantadesign.com/MILpdfs/MIL5-H/MIL5H-6-3-5.pdf
RE: inconel 718 at 900C
http://www.specialmetals.com/documents/machining.pdf
http://www.specialmetals.com/products/inconelalloy718.htm
RE: inconel 718 at 900C
Are you looking to have a final hardness of 32 HRc after machining and subsequent solution annealing/aging heat treatment of Inconel 718?
The link provided by TVP provides various options regarding heat treatment of Inconel 718. The heat treatment options depend on end-use;
for example the lower (1700-1850 deg F) solution annealing temperature/aging will provide the highest rupture strength, tensile strength and yield strength.
the higher (1900-1950 deg F) solution treatment temperature/aging will result in lower tensile and yield strength but will have increased ductility and low temperature tensile strength.
There is a third heat treatment that follows NACE MR0175 guidelines for oil field applications. The hardness range for the solution annealed/aged Inconel 718 is between 30-40 HRc.
RE: inconel 718 at 900C
RE: inconel 718 at 900C
yes looking for final hardness around 32 HRC for end use after machining. Ive taken a look at the phase diagram but am wandering if all machining should be done in one shot after heat treating before age hardening or whether to machine in 2 stages going back to heat treating, going from 1/2 inch to 1/4 inch thick, need to account for potential notch sensitivity and control distortion.