decarburization at stress concentrated zone

[limct]

Hi all,
I have a part made of AISI 8620, it's hot forged and then go for carburizing process. I notice some stress concentrated zone (at right angle corners especially), are found to have appreciably lower carbon content than it intrinsic level. How can this happen?

Best regards,
ct

 

[Carburize]

Geometry effects the rate of carburization - in gear teeth for example it is typical to get only about 2/3 the case depth in the root compared to the mid-tooth area.

 

[unclesyd]

What process are you using to carburize the parts?

A little more information might help someone resolve you problem.