Great feedback, thanks to all!!
Here is more data for discussion.
1) We do core treat our forgings proir to machining to
BHN 285 avg. at 1180 dgrs. (F).
2) No stress relief proir to nitride has been tried, but will be soon!!!!
3) Our deep cycle gas nitride temp. is 1100 dgrs. (F)
with the...
We are experiencing growth of our ring gears during nitride. The gear teeth are fine, but at the top face where the gear is the thinest, the counterbores grow as much as .005". Our material is 4140 and nitride cycle time is currently 26 hrs.
