Effect of nitriding on nickel alloys.
Effect of nitriding on nickel alloys.
(OP)
I have a piece of maraged steel welded to a piece of nickel alloy (nimocast 718).
After the welding, the assy will be nitrided.
What I need to know, and what seems to be driving our metalugist mental, is what effect (if any) will the nitriding process have on the nickel?
The reason I ask, is we will need to do some machining on the nickel part of the assy following the heat treatment. I would like to turn it, but I don't know if that would be the best choice, given the nitriding. We could grind of course, but that would require us buying some more tooling.
Anyone know?
After the welding, the assy will be nitrided.
What I need to know, and what seems to be driving our metalugist mental, is what effect (if any) will the nitriding process have on the nickel?
The reason I ask, is we will need to do some machining on the nickel part of the assy following the heat treatment. I would like to turn it, but I don't know if that would be the best choice, given the nitriding. We could grind of course, but that would require us buying some more tooling.
Anyone know?
RE: Effect of nitriding on nickel alloys.
You are nitriding a Nickle Alloy??? Is this REALLY a steel with a nickle constituant???
Every reference I have for nitriding confines the topic to specific STEEL alloys. I think I understand Your metallurgist's "issues" with this situation!
The steel welded to the nickle alloy [Inconel 718?] is a very strange combination. I suggest that the weld-bead will see transition ferrous-nickle alloy elements... and the metallurgy of the weld is going to be a bit strange [may be unpredictable]. I tend to believe that the affects of nitriding should be confined ONLY to the steel and the weld-bead [fusion zone]. What good or bad this nitriding [and weld-material combination] accomplishes may require EXTENSIVE testing [physical, mechanical, environmental]!!!!
Regards, Wil Taylor
RE: Effect of nitriding on nickel alloys.
Are there any rough guidelines on what materials will take a nitride treatment? I've never tried nitriding alloys 718 or 925, I just assumed it wouldn't work. I know 17-4PH nitrides extremely well but 410 wont take a nitride worth a darn. Do you require a minimum Fe content or is there more to it than that?
RE: Effect of nitriding on nickel alloys.
The material is nickle base alloy, and is basically the same as the material given by British Standard HC209 with some additional requirements. Our metalurgist has been through the elements that make up the material, and he is of the opinion that nitriding wil probably have no effect. But he can't be sure.
Hmm, I think we're just gonna have to try it, aren't we!
RE: Effect of nitriding on nickel alloys.
RE: Effect of nitriding on nickel alloys.
Your metallurgist might be interested in a TTT diagram for the alloy. See: A. Lingenfelter, "Welding of Inconel Alloy 718: A historical Overview," in Superalloy 718 - Metallurgy and Applications, Edited by E.A. Loria, TMS (Warrendale, PA; 1989).
RE: Effect of nitriding on nickel alloys.
RE: Effect of nitriding on nickel alloys.
(I've got another job now.)
Excessive accuaracy is a sign of poor breeding. -Socrates.
RE: Effect of nitriding on nickel alloys.
Is there any possibility that the nitriding process can be done in the gear surface?
Thanks a lot!