Effect of Nitriding on Nickel Alloy

[knobhead]

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?

 

[gbent]

Make up a cheap dummy assembly and test it.

 

[knobhead]

Wish we could. The Ni is an investment cast blisk, and by that point wil already have a couple of grand added-value on top. Time to live dangerously!

 

[Nitron]

Ni itself will not form nitrides but other alloying elements in your Ni alloy could.
What is the composition of the Ni alloy ?
How about nitriding a sample of that alloy ?
Is it being gas-, salt bath- or ion nitrided ?
Your specs. of nitriding, white layer composition (gamma prime or epsilon or mixed or none), its thickness and the depth of the diffusion zone below the white layer all will have some influence on the performance of your part.
Contact me if you need more info.
Pramod Kotwal
pramodkotwal@nitron.nu